【 Weak current college 】 computer head light and scanning light use of the similarities and differences

Computer lamp structure features and similarities
Now popular PC lamp by structure type to generally there are two types of lenses scanning computer lamp, the other is shaking-intelligent lights.
Lens light scanning computer is on the front burner of the lamp on a reflective piece swing to projection beam. Lenses by pitch and position of the two motors, complete vertical and horizontal swing. Its biggest advantage is that the lens is very light, it is very easy to control, to produce a very rapid changes of the light beam movement. The drawback is: reflector, beam axis of range of motion. Therefore, more suitable for hanging.
"Ecstasy"-type computer lamp, is the origin of intelligent lights originally envisaged, it has the advantage of driving beam lamp rotation movement, rotation of a wide range to be rotated 360 °. This motion effect to produce flavor on the stage full visual experience. The disadvantage is driven by motor power shake of larger, heavier caused light body. But as scientific and technological progress, this disadvantage has gradually been overcome, makes such lamps in recent years been leaps, has become the mainstream TV arena intelligent lights. Its volume is already able to do very small, the weight to be very light, it is very easy to use. This kind of computer it is function of the lamp is more and more full, from the initial subject to technical limitations can only do a pure color effects, has developed to the same lenses as scanning computer lamp, can produce very rich artistic computer lamp. Suspension and are suitable for display.
The use of occasions
Beam scanning lamp is small and therefore more suitable to the suspension or bar hanging, and far, subject to the limitations of the scope. For example, a relatively large theatre, a large concert has professional stage steel frame and light bridge, Rod is ideal and scanning light lifting, as these local use.
Now the head light technology has been considered by leapsand bounds, small size, light weight, features more and more, but also more convenient to use, display, hanging can, in some such as KTV, disco, diffuse shake, fan club, the small outdoor summary performance, can be used.

【 Weak current College 】 stage machinery safety design (2)

2. safety equipment
Device security refers to the stage machinery equipment in working condition long-term use no accident; in the event of a temporary failure could reduce the technical parameters after working capacity; stage machinery equipment on non-functional State of perception, ability to display and alarm. This capability or performance are usually mechanical design itself and completed with electric control; consider performance stage machinery cannot be ruled out as soon as possible of a temporary failure of the stage machinery of the failure as possible without affecting the performance of the work.
Involves device security to a number of factors, mainly has following several aspects:
1. adequate factor of safety
All mechanical parts of the selection and design must guarantee at rated load and inertia loads under the combined action, be reliable and have certain security reserve, i.e. sufficient safety factor. Safety factor is defined as: all the materials of the ultimate stress and part of the maximum operating stress ratio. Part of the working conditions should consider maximum static load and dynamic load (emergency braking, collision, and so on reboot inertial load) under stress. For example: hanging weights or traction wire rope, the safety coefficient should be greater than or equal to 10; lifting chain of safety should be greater than or equal to 12; transmission chain of safety should be greater than or equal to 10; all parts of the transmission system in the selection should be able to withstand two times the load rating; initial brief calculations, transmission parts and mechanical parts of the safety coefficient should be greater than or equal to 6, precise calculation of the safety coefficient should be consistent with the relevant standards or specifications on the part of the class.
2. appropriate stiffness
The stage machinery of major force widget should have appropriate stiffness in order to adapt to the needs ofthe stage performance. Typically, the provisions in force in the Member deflection should be less than the widget span of 1/1000 ~ 1/800, sometimes also the absolute value of the deflection, these components must meet both requirements. Transmission parts of torsional rigidity, stability, etc. compressed should comply with the standard norms. On the platform, in order to obtain sufficient lateral rigidity, which calculates the horizontal load of not less than the vertical movement of the load of 1/20.
3. reasonable structure and the dimensional parameters
To avoid or reduce certain structural dimensions of machine parts as unreasonable and excessive additional stress or premature fatigue failure, the design-time structure should be given enough attention. Winch system parts typical, such as: winch drive drum diameter should be greater than the diameter of the wire rope and pulley diameter 18 times larger than the diameter of the wire rope 20 times, friction drive (traction transmission) of the driving wheel diameter should be greater than 40 times the diameter of the wire rope, etc., all of the accessories are ropes and wire rope diameter to be matched, rope connector can only use those delivery loads greater than 80% of the wire rope breaking load of the coupling type, such as: splicing connector, alloy cast casing joints, wedge-shaped connectors, extruded aluminium alloy casing and comply with the requirements and proper use of steel wire rope clips, etc. Drum flange height should be greater than 2 times the diameter of the wire rope, single-layer winding of the drum, leaving at least two ring friction fixed ring, steel rope and reel or pulley of deflection angle should be less than 4 °.
4. reliable security appliance
The stage machinery and equipment must have better security protection devices to ensure the safety of the operation of equipment. General devices are equipped with stroke limit switches and hyper-limit switch. Similar to the boom winchor supposes, winch rope protection, job hopping or composite rope protection, overload protection and speed (over current) protection and other security measures and in the very context display and alarm in the event of a dangerous situation, the control system only allows devices to reduce the dangerous movement. When the device returns to normal status in order to continue the original campaign. For security purposes, the stage machinery of the brake must be: two independently controlled brakes (or hydraulic lock), or institutions self-locking (including reducer self-locking) together with a brake. Moreover, each actuator is take all the transmission torque. In a two-stage brake when one is working brakes, another is the safety brake.

【 Weak current college 】 computer head light and scanning light use of the similarities and differences

Computer lamp structure features and similarities

Now popular PC lamp by structure type to generally there are two types of lenses scanning computer lamp, the other is shaking-intelligent lights.

Lens light scanning computer is on the front burner of the lamp on a reflective piece swing to projection beam. Lenses by pitch and position of the two motors, complete vertical and horizontal swing. Its biggest advantage is that the lens is very light, it is very easy to control, to produce a very rapid changes of the light beam movement. The drawback is: reflector, beam axis of range of motion. Therefore, more suitable for hanging.

"Ecstasy"-type computer lamp, is the origin of intelligent lights originally envisaged, it has the advantage of driving beam lamp rotation movement, rotation of a wide range to be rotated 360 °. This motion effect to produce flavor on the stage full visual experience. The disadvantage is driven by motor power shake of larger, heavier caused light body. But as scientific and technological progress, this disadvantage has gradually been overcome, makes such lamps in recent years been leaps, has become the mainstream TV arena intelligent lights. The audio, video, introduction of relevant international standards in the field of volume has been able to do very small, the weight to be very light, it is very easy to use. This kind of computer it is function of the lamp is more and more full, from the initial subject to technical limitations can only do a pure color effects, has developed to the same lenses as scanning computer lamp, can produce very rich artistic computer lamp. Suspension and are suitable for display.

The use of occasions

Beam scanning lamp is small and therefore more suitable to the suspension or bar hanging, and far, subject to the limitations of the scope. For example, a relatively large theatre, a large concert has professional stage steel frame and light bridge, Rod is ideal and scanninglight lifting, as these local use.

Now the head light technology has been considered by leaps and bounds, small size, light weight, features more and more, but also more convenient to use, display, hanging can, in some such as KTV, disco, diffuse shake, fan club, the small outdoor summary performance, can be used.

【 Weak current College 】 read KOSMOS PRO actuator

In sound reinforcement systems, peripheral devices on the audio system is also critical, on-site auditory effect is good or bad, is closely linked with the peripheral equipment. While in many peripheral processing equipment, the actuator is an influential processing equipment. Its application areas, theatres, Conference Hall, multi-function Hall, DISCO dancing and singing etc can all see it. Audio system to properly use the actuator may enhance audio clarity, can be about sex and expressive and increase loudness, sound more enchanting, reduce the auditory fatigue; increases the sound image of three-dimensional sense and sound isolation, improve the sound level, thereby enhancing the quality of the sound playback, more beautiful to listen to the result.
For members about a company from PEAVEY's low frequency Exciter-KOSMOSPRO. The equipment is original Kosmos adds new sound control options such as STRATOS (increased luminance); Barometric switch control (regulation XPANSE range). Other new controls include a modified range of ultra-low frequency stimulation THUD switches, is used to modify QUAKE in compact or loose the dynamic control of the response, as well as high-precision band switch input/output level tables, as an innovative design, powerful low-frequency actuator. It can produce results in excellent low frequency output, thus increasing the clarity of any sound system and accuracy.
1. front panel features
1) bypass switch
When this switch is turned on, in addition to the low frequency suspension frequency level control (when off the kosmos-bass), other features disabled, signal output directly, while a red led is lit.
2) input level control
The knobs adjust the input gain. In order to have a good-to-noise ratio and performance regulation should monitor the input level meter. Adjustment to 0dB, led most of the time flashing, and the clipping indicator LEDs light does not shine as well. Because the center anchor is unified gain points,if the input level is too high, heavy bass may lead to clipping and distortion effects signal effect.
3) level selector switch
This machine level meter can display after level control after the input level, output level can also be displayed by level selector switch to switch the two-level display status. When this switch is pressed display output level; when the lift is display the input signal level. LED level indicator with yellow and red colours, yellow led light indicates warning, while a red led is lit indicating how there is 4dB cut off. During testing, when you see the yellow led is lit for a long time, it is necessary to note the level adjustment. In order to avoid signal overload, whenever possible, do not let the red light is lit, so as to ensure the best signal.
4) output level control
The knob to adjust the output level of the device. The centre point is unified gain points, 10dB gain can be used. When the bypass switch is pressed, the button does not work. The knobs are also adjustable S/PDIF output level.
5) subwoofer cutout switch
The switch from left and right main output removal after QUAKE and THUD-treated low frequency. It will not be removed from the program's normal bass. When you use 3-way speaker system, you can make all the increase of low frequency output from the Subwoofer port only. When the left and right speakers cannot produce low frequency processing extra, this is the best way to increase low-frequency. By XPANSE and STROATS signal is always sent to the primary output and are not affected by the impact of the switch.
6) pitch switch
Used to change the two different sizes of low-frequency harmonics between speakers of the base frequency. The "OUT" location has a higher centre frequency, which is more suitable for small speakers. "IN" position the center frequency down, in order to allow big speakers lower bass. If there is no significant difference, maybe the speaker does not exhibit reduced bass, it is recommended to use small speaker settings. If you modify the minimum frequency, the power amplifier has been working to bring to the speakers.
7）QUAKE
This switch can produce an even lower than the sound source a octaves of integrated low-frequency signal. It and DYNAMICS, corresponds to a specific frequency (frequency and amplitude) produces a natural low-frequency harmonics. When the input signal is beyond the scope of the set, it cannot go beyond this frequency effects processing. It also can enhance, increase the proportion of low-frequency frequency of music, particularly the bass drum. Because it also push for low-frequency section, care must be taken not to produce extra, extra low-frequency level so that the power amplifier is distorted or damaged speakers, especially when using small speakers.
8）QuakeActive
The reverse gear is used to indicate the QUAKE activity. As a reference, in the light does not light, if available, low frequency information exist, although the level may be very small, low-frequency harmonics are still in production. If there are no bass component sources, this lamp is not lit.
9）Dynamics
Some want low-frequency bass natural harmonic followed closely; there are times when you want it follows some loose, QUAKEDYNAMICS control can be adjusted to it. Follow tight, the increase hit effect; follow pine increases more bass, like the impact of a suppressed the bass drum, there is no impact on non-rejection of bass drum sound.
10）THUD
This control is the low-frequency harmonics QUAKE by adding a special chrome (natural instead of synthetic), it's about regulating a octaves above the low-frequency harmonic and balanced manner, using low-end. THUD and QUAKE on tweak the wave, the phase change, it will effectively modify waveform and amplitude, sound may and what you would expect.
11）DEEPER
It narrows down the THUDCircuit, delete parts of the bass frequencies. This makes it much more low frequency adjustment.
12）XPANSEbr>Use this switch in conjunction with BAROMETRICS, you can increase the frequency and bandwidth, minimum stereo position is the flatness of the settings. Clockwise rotation, left/right sound like a wider, while at the same time increase the sharpness. It is designed to maximize the sound of tension (elevating) mixed, and decrease the speaker's dressing filtering effect. It does not put the Mono sources into stereo, but it will improve the signal.
13）BAROMETRICS
This knob control XPANSE circuit between the two process phase. When counterclockwise (intensive) phase of dominant, clockwise rotation (thin) intensity high frequency increase. A typical setting close to the middle position.
14）STRATOS
This knob to the sound source to increase high-frequency harmonics, the frequency range above XPANSE range. It gives boring sources increase crisp effect.
15) bass
KosmosPRO internal has a low frequency divider 90Hz. Heavy low signal is QUAKE, THUD and from 90Hz divider of the aggregate of the low-frequency signal; this knob will change the output level. When the bypass, the increase of QUAKE and THUD portion will be dropped, leaving only the low frequency divider for low frequency signal. In this mode, is a standard bass control.
2. the back-panel features
1）S/PDIF
This is a stereo digital input output interface, the connection to other digital devices, such as computers or DAT recorder. If the default is no, then enter 44.1kHz will sync to the current frequency (up to 48kHz). If it and enter the clock locked, syncs indicator light; if there are errors of data err led light. If you select S/PDIF KosmosPro input modes, digital inputs is the only connect to the internal analog processing, but it will always synchronize internal sampling rate (if it has a clock). S/PDIF digital output has always been there, and about the same as the main output and. Digital full scale (0) is equivalent to an analog device pointer position (+ 22dBu).
2) subwoofer output
This is a balanced output 6.35mmTRS e, for balancing (6.35mmTRS plugs) or non-equilibrium (standard 6.35 plugs). Output also provides a signal to the subwoofer amplifier (line signal).
3) left and right output
Left and right output is electronic balance type, the Add method and the bass output as [② feet (or "tip" for cathode]. Card Lennon and 6.35mmTRS plugs directly parallel wiring. As balanced and unbalanced mixed into the same channel output, it becomes unbalanced. In mono mode, have left/Mono to mono output signal.
4) input
Left and right input is the balance of ② feet (or "tip" as the cathode. Card Lennon and 6.35mmTRS plugs directly parallel wiring. When you use a Mono signal, received left/Mono interface (card Lennon or 6.35mmTRS) and press the MONO selection switch.
5) input selection switch: you can select the simulation (card Lennon and 6.35mmTRS) input or digital input; select one another will be disconnected. This switch affects the left and right input. When the switch is selected in the S/PDIF digital input, MONO switch will not work.
6) MONO selection
If you use only one input channel KosmosPro, this switch should be pressed. It guarantees between left and right signal processing in the appropriate range. This switch does not S/PDIF unit.
3. the application of the system
KosmosPro in system connection generally use the threaded mode, and before the power amplifier, but then after the other peripheral equipment.
String into left and right channels, compensation, comprehensive voice signal because the left and right channels in various sound sources are mixed together, only for the overall compensation. Before the power amplifier, because power amplifier frequency response curve best, generally within 100kHz 10Hz — its gain change 0-0.2dB and actuators on the treble and overtone of compensation only 0.5-1dB, through the power amplifier is capable of varying success rate signal, direct drive speaker. If the add-in before other peripheral equipment, most likely because these devices are ideal frequency response performance, compensates the quantity is small in the treble and overtone constituents and lost, in this connection, it is usually a normal drive level.

【 Weak current College 】 mixer's basic operation principle

Sound mixer: Studio dedicated and dedicated two stage dance hall. 
Mixer's role is to:
1, pick up the signal, to zoom in;
2. press the required high, mid, bass tone Equalization;
3, will signal about bus as needed into or control group;
4, to feed into the secondary bus signal processing for art;
5. press the required output control. 
Mixer can be divided into input and output unit. 
(A) input cell input cell is an important component of a mixer, the input cell is tap parallel lines that are roughly the same per, generally can be divided into the following sections. 
A, input, select the portion of the TAPE: tape 1, 2, 3 MIC: microphone, LINE: line
B, the input Attenuator (PAD) if microphone or line input signal level is too high, while the gain control is unable to adjust, the attenuation switches to open when the preamplifier and input socket on the inserted a 20dB attenuator, to avoid overload. 
C, input gain control (GAIN) mixer sources are: microphones, musical instruments, tape, effects, sound amplifying equipment.
Because of their output level, in order to be able to match with them, we should use the mixer to gain control of the input sensitivity adjustment. If the input signal is too high can lead to clipping distortion, and vice versa if the input signal is too small, the noise will be unable to control the gain control is used to guarantee the sound mixer in fixed dynamic range. In the Panel gain control level size representation is 0dB = 775mV basis, depending on the size of the audio source output level, set in a different location. The input signal and gain level is shown in the following table. Gain (dB) 〓 input signals-60 to-50 〓 low-level microphone-microphone 35 〓 high (capacitance), electronic musical instruments-20 〓 low-level line (audio)
D, signal input jack is divided into low impedance balanced input (LO-Z card Lennon) and high-impedance unbalanced input (HI-Z 2 cores). General musical instruments and audio equipment in connection with non-balance, signal the "+" and "-" at one end and signal line screen public. For example: a core shielded cord, core wire is signal "+", shielded wire is signal and ground "-". This is better than no shielding of parallel lines induced noise, not belonging to the tube easy-masking. Professional audio device input and output are balanced, signal the "+" and "-" transport and then screened cables, "+" and "-" use independent of ground and plug XLR Plug me in using the card. 
E, overload (CLIP) overload is used to indicate the input signals instantaneous overload warning, the LEDs will peak (signal too large distortion level occurred) level when the glow below 3dB, easy to help set the gain switch location. 
F, input balance section input channel Equalizer is used on the input signal tone for the corrections to achieve a standard effect. As a result of a single control, so the mixer can make all the way to each balance control, but do not interfere with each other, the balance is divided into: HF (HIGH), medium (MID), LF (LOW). 0 location is flat; + direction (gain), + 15dB (enhanced 5 times);-direction (attenuation),-15dB (attenuation 5 times). Continuously tunable. Equalizer generally use the treble (10kHz), baritone (equalizer center frequency can move freely between 5kHz 350Hz — set), bass (100Hz) three equalizer. Because of the frequency section has a separate control, so you can enter a careful adjustment of the signal, which in turn can also adjust the tone for the bold attempt and squealing noise, noise, and so on not necessary ingredients to be effective.
1, high-frequency: 10kHz ± 15dB/slope impact zone: musical harmonics of the treble zone. Gain effect: metal sound increase, apical timbre comparison, gain too much noise can be clearly heard. Attenuation effect: can effectively remove hiss, attenuation is too much treble district of sense will be lost. 
2. intermediate: 3kHz ± 15dB/peak impact zone: musical instruments, voice and treble. Gain effect: the timbre brighter, harder texture, gain too much auditory fatigue susceptibility. Attenuation effect: music balance tends to bass, including sound will feel the same way. MF: 1kHz ± 15dB/peak impact zone: musical instruments, the human voice in tempo. Gain a clear effect: contour tone, sound phase forward sound projection, drum head modulated. Attenuation effect: after acoustic facies. MF: 500Hz ± 15dB/peak impact zone: the musical instrument, the bass voice. Gain powerful effect; timbre rich, gain too much telephone tone appears. Attenuation effect: tone head hard, balance tends too much treble, attenuation thin texture. 
3. low frequency: 100Hz ± 15dB/slope impact zone: musical bass area. Gain effect: a rich timbre, gain too much, the teeth tone is not clear. Attenuation effect: sound more relaxed sound good, tooth, background noise and loud hum noise effectively remove. 
G, acoustic phase knob for adjusting the crosstalk signal left, right balance, location in the channel after the level adjustment potentiometer. And each input channel signal on the Group 1-2 and 3-4 group rooms pan position location is determined by the knob. If the knob position in the Middle, pan position also in the middle. Knob to the left, navigate to the group in 1 or 3. Rotary tuning to discussions, positioned to the right in 2 or 4 groups. 
H, sniff (MON/SEND) sniff used to control the monitor bus input signal level value, this control in addition to gain control, is not subject to any control on the channel switch control (including the channel volume control). Therefore send signals and relatively independent of main bus bar signal. [fenye]
I, effects send (EFX/SEND) it includes all peripheral devices, used to determine the internal or external effect of the number of letters in theNumber into the input signal. It is balanced and volume attenuator, because each channel has its own effects sends, so by adjusting thenumber of channels, can make a difference, while other channels do not produce results. But be aware that internal and external effect one send control, so they should have the same audio source. 
J, listen switch (PFL/CUE) when this switch is "ON", the input channel signal to earphone to listen and to confirm the level meter, listens to switch on the order of precedence to firmly in mind.
Mixer operation terms and for the control of
GAIN: input signal HIGH-gain control: treble level control
MID-HIGH: treble level control LOW: bass level control
PAN: phase control MON.SEND: tap listens to signal control
EFX.SEND: tap effect signal control LIMIT (LED): signal amplitude indicator
LEFT.: left RIGHT signal level control: the right road signal level control
MONITOR: monitor system MON.OUT: monitor output
MASTER: General road level control EFX.MASTER: effect of the output level control
EFX.PAN: effect of phase control EFX.RET: effect return level control
Effect send EFX.MON: monitoring system level control DISPLAY: level meters
ECHO: reverb HIGHIIN: high-impedance input
LOWIIN: low resistance to enter OUT/IN: output/input jack
AUX.IN: auxiliary input multi-output MASTEROUT: total
EFX.OUT: effect of output results returned input EFX.RETURN:
LAMP: special lighting power supply POWER: total power switch
BALANCEOUTPUT: balanced output FUSE: a fuse
PEL: pre-listening (audition) press the EFF: effect of level control
MAIN: main LEVEL: channel balance control
HEADPHONE: Headphone Jack PHANTOMPOWER: phantom power switch
SIGNALPROCESSOR: signal processor EQUALIZER: equalizer
SUM: total output group switch LOWCUT: low frequency cut switch
HIGHCUT: high frequency switch PHONOINPUT resection: player input
STEREOOUT: stereo output ACTIVITY: dynamic indicator
CUE: selected to switch MONOOUT: mono output
PROGRAMBALANCE: primary output sound image control MONITORBALANCE: listen to output sound image controlr>EQIN (OUT): Equalizer access/exit key FTSW: foot switch
REV.CONTOUR: reverb profile regulates PA: fixed value decay, attenuator

【 Weak current College 】 audio cable in the audio signal transmission in the importance of (a)

Whether it's music production equipment or a sound playback device, audio cable has always been an important part, but quite a lot of people do not pay attention to it. This or short or long lines, the rough, has a small core, and all kinds of joints, play audio data transfer, and if a good music playback devices, does not match a proper audio cable, you will not be able to achieve the best playback effect, sometimes even bear to listen to "miserable." This article describes audio cables and related issues, there is only one purpose — to make the best transmit sound signals.
Digital audio cable
In General, because many digital audio cables use the same with analog audio connectors (such as cards, Lotus mouth agricultural XLR, RCA), many people with analog cable temporary place of digital cable. Although they can improvise, but you must realize that this is very wrong.
Analog cable and digital cable is a completely different analog cable impedance requirements, because the length, in cable points, impedance in 30 to 90 Ohm impedance fluctuation between changes, and will not affect the sound quality of analog audio. And this is for digital audio, digital audio signal frequency is very high (approximately 3MHz) of pulse wave, in order to accurately transmit signals, cable must be sending and receiving equipment match, the entire cable impedance must be consistent. For example, AES/EBU cable must be the other end from one end to show constant 110 Ohm impedance, which is also the AES/EBU cable than appearance almost microphone cable expensive many causes.
If you are using analog cable temporarily replace a digital cable? first because the impedance mismatch, the cable will have a standing wave reflection, "pollution" signal, the outline of the pulse wave. Pollution also from cable distribution capacity, it can reduce cable of high-frequency response, impact pulse rise time. Pulse waveform in high and low voltage conversion defined out signal 0 and 1,if you were not the correct impedance and capacitive effects has been polluted, pulse signal, the receiver of the signal interpretation error occurs, a time before and after the offset (called a flutter, Jitter), which reduces the audio quality, even wrong code appears.
Making computer music cannot be separated from the rest of the audio cable, they do not have a microphone, synthesizers, sound mixer, za, and other equipment that has a striking appearance, often looks like spread all over the floor. The average user on the device, compare careful careless, connecting cable comparison on the line, not much attention to quality. If all devices are generally lower, cable digital out insufficient also; if Studio equipment is advanced, low-quality cable became the sound of the "bottleneck", we will follow it degraded. Then replace the cable investment is necessary.
Analog audio cable
Analog audio cable can roughly be divided into three categories: microphone cable, guitar/line cable and loudspeaker cables. Typically, the center part of the audio cable is a conductor, is the carrier of the audio signal. Conductor outside covered with non-conductive plastic or rubber, and the outside is made up of a conductor, which on the one hand, the shield is isolated from the external interference, on the other hand, constitute a signal ground wire (loop). The outermost layer of the skin can protect the internal layers so that the cable is durable. Audio cable for general use copper conductor, because it cost low, the electrical conductivity is good, more flexible. However exposed to air oxidation of copper easily and become poor conductor copper oxide, affect current conduction.
Analog audio cables use the typical form of several patch, microphone typically use card administrative (XLR), line connections using large three-core (1/4 inch) or Lotus mouth (RCA), speaker cable connector often bare copper wire, sometimes with banana plugs or other plugs. Plug and socket binding, full ductility of gold-plated layer can fill the gap in the connection, keep the good connections.

【 Weak current College 】 woofer speaker setup and settings---Power By 【 China power house network 】

When you carefully adjusting a home theater system, you want to find a woofer speakers the best location to home theater systems to achieve optimum combination and sound effects for home theater users this has always been a great challenge.
In this challenge, there are two major factors are indispensable, surrounded by the listening area room boundaries and the boundaries around air energy storage capacity. These two factors combine to determine the listening area of unique acoustic properties.
Repeated testing is the key to getting the best sound and practical way. Reality does not exist a perfect set-up locations, you can only find those closer to the perfect location. You need to draw many sketch, and in some ways to make some compromises. Compromise is not only listening room acoustic properties of the result, but also for the beautiful, practical and other considerations, such as the wife of preference, and you cannot fail when back to business. In some families, wife of preference may be the most decisive factors.

The Bible of the woofer Setup cheat codes will be introduced to you, in one listening room how to display two woofer speaker. The trick here is to teach the technique does not require any type of measuring instrument, you only need a pair of ears can take care of everything. Of course, you also have the most basic test signal, such as a test CD albums and hit, or contains a large number of low-frequency content of music CD album. If you have a can of accurately measuring the sound pressure instrument, of course, the best; but if you haven't, don't worry, we have tricks up their sleeves.

A, room control

Many people have for their room the size of the "ideal" and proud. In General, the area of the listening room, low frequency waves can be heard, the fewer problems. In order to get smooth and balanced low-frequency sound, room ceiling to not less than 3 m, width to 3.6 m, length to 7.5 m (if you want more deep low-frequency, 9.1 m). Room of all sides (including the diagonal line) should not be an integer multiple of Sonic wavelength, the resonance phenomenon will occur. Of course, the larger the listening room, the more you need sound facilities to reduce acoustic reflex, but standing wave is generally not in the formation of large listening room. Another point is very important to use the absorption material, this time-frequency attenuation in General and to the same frequency. This is what people call "neutral room".
Light and flexible walls can act as a very good sound-absorbing walls, where low frequency sounds will go through the wall, there is no reflection. The gypsum board, timber and dual layer structure with the correct stone built walls can achieve this effect. A world class standard room usually require the use of sound-absorbing materials, powder tones/to eliminate resonance or echoes. To watch out for the holes in the walls, they also can cause resonance. Build a good low-frequency response, proper internal acoustic features and State-of-the-art external noise effects of large room is a professional audio Division.


Second, the speaker's place — use the feet or shock pad?

Speakers can be installed in a hole in the wall, the speaker of the front panel and flat to the wall. This installation requires the skills of the professional sound engineer, we don't do too much of the discussion. Main speaker must be coupled with the removal of the floor. Heavy and solid tripod at the top to the bottom of not greater than the speaker in order to avoid the sound diffraction (this is a kind of comb-filtering). Feet stable effect is good, but is easy when using the carpet punctured carpet.

Some people recommend heavy speakers following pad lock-mat in place of the feet. No matter which Hina, its goal is to reduce the synchronous resonance, or reduction in the box, floor and wall between the conduction of sound. Cabinet and the tripod's resonant frequency should be very low. Fist on a knock box, to confirm that it does not have a resonance characteristics to your audio system to input a sine wave signal, listen to the watch case is there any vibration.


3. positioning of the speakers

The woofer speaker set-up, we assume that: (1) you have a pair of healthy ears, you can assess your room's acoustic characteristics; (2) unless otherwise noted, you are using two woofer speaker; (3) do you have enough test signal software to test your listening position heard sound field characteristics at different locations, as well as the room is how it affects the sound effects; (4) sound system all necessary correction work already completed.
Woofer speaker set-up and correction can be divided into five steps:
1. woofer speaker set-up adjustments; 2. listener seat adjustment; 3. the main speakers and woofer speaker phase adjustment between; 4. the balance of the various parameters; 5. woofer speaker and main speakers match of gain.
I have seen in a room in the system to adjust the sound system to determine if more than one woofer speakers the best set-up of different methods. Here is one method:
This is a process of trial and error, you may want to once again listen to the same content. When you're bored you can sit down and have a rest, to auditory fatigue to a minimum.
In each test every step to make notes, to take advantage of some of the chart, try to write down some details, such as speaker set-up, and set the parameters, and so on, so that when you feel the sound is one hour earlier, you can then adjust back to a previous state. Remember, here you have to deal with the many variables, a record of each parameter can make adjustment process faster more efficient.