【 Weak current College 】 home theater but speaker refractory? with my final (in)-Power By 【 China power house network 】

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Home theater speaker system, also known as AV speakers, and high definition (HiFi) speaker is differentiated and linked to both AV speakers or HiFi speakers, high-fidelity speakers should meet the minimum performance requirements. Speaker is a subjective assessment of color of equipment, and ordinary consumers when it is difficult to grasp in buying, this article provides tips for buying, focusing on practical and actionable, hoping to enhance consumers ' on bad equipment of immunity.

　　
1. takes note of the differences between the speaker diaphragm material

　　
For home theater speakers, forms, there is the main speaker, surround, etc. in place and, first of all requires channel speaker sound. The tone is the sound characteristics of reflected, ordinary consumers effectively it is quite difficult to grasp. General speaker diaphragm material influence on the timbre is obvious.
　　
Conical diaphragm material mainly plain paper, mixed wool basin, surface coating resins Cone, PP basin, carbon fiber weave Bowl and glass basin, etc. Plain paper trough widely used, low-cost, its basic tone is neutral, the flaw is high-frequency response of the paragraph is not easy to handle when the-n, there are limitations on the skin. Cone with wool, mellow timbre brings a warm feeling. Surface spraying resin material cone has changed appearance, more delicate timbre. Fiber woven basin inner damping is large, flat, easy to carry out the response frequency is connected, but expensive, bass handling bad there will be a hard close on a subjective perception of hearing. PP-basin in the high-frequency broadcasting better, stronger sense of depth, but as a bass in home theater use restricted.



Ball-shaped diaphragm is typically used in high frequency speakers. Materials are hard ball such as aluminum and titanium alloys, soft ball silky membrane, membrane and nylon membrane. Hard ball a wide frequency response, sound penetrability, sense ofdepth. Soft ball frequency response is flat, timbre. Hard ball speakers generally good at replay analog audio source signals, soft ball speakers generally good at replay digital sound source signal. This is just a relative concept cannot therefore conclude that: hard ball top speakers are low profile, soft ball top speakers are top-grade configuration. If this said, the extensive use of titanium films of JBL company not only produces low quality goods, hard ball? actually top speakers is best applied to three different frequency speaker, soft ball speakers of relatively much easier. On the other hand soft dome speakers prices relatively low, usually only for hard ball speakers 1/3 ~ 1/2, so the more marketable speakers use soft dome speakers. However, in a home theater, because the sound is dynamic, and soft ball dynamic speakers, high-power voice more easily nervous, pay particular attention to the time of purchase.



Consumers on the speaker's tone was a general understanding that the purchase can according to their own preferences to determine what speaker, if they feel uncertain, it is best to enable home theater several speakers speaker diaphragm material.
　　


2. takes note of the double bass speaker and passive radiation-speaker difference
Double-bass speaker is a speaker uses the same two-diameter woofer, dual bass speakers of low-frequency radiation efficiency high, the horizontal nature of the good, the more suitable for home theater use. And passive radiation-speakers as a bass speakers plus a passive radiator, and look very similar, both in the same specification, double-bass speaker cost, price and bear power than passive radiation-speakers. Both methods are as follows, playback, respectively hold two bass vibration unit and sound are smaller and there was no significant difference, for double bass speakers. If you suppress a bass vibration unit and sound smaller, suppress other bass vibration unit medium frequency sound nothing changes, just bass and weakened, the latter is passive.







3. reset the speaker selection in skills

Central speaker forms relatively fixed, reset the speaker generally uses two 4-inch or 5 inch units, or on the basis of a ball top treble, its main role with a clear, stable and sound image, sound and image moves to guarantee its continuity and smoothness. Some of the speakers of the front is designed with the bottom surface of a certain angle. If you reset the speaker placement in higher or lower, use this class to reset the speaker more appropriate to compare the ease of speaker axial radiation at the audience.





In Dolby directional logic normal mode, reset the speaker requirements are low, the market of the speaker are in this category. In Dolby directional logic broadband mode and AC-3 system, on the central channel requirements are higher, demand response is flat, low distortion and wide dynamic, reset the speaker is preferred and the main audio channel of the speaker, or at least consistent indicators on should also close to the main channel.
In most of the speakers of the target, the lower the frequency response of about 80 ~ about 86dB 100Hz, sensitivity, power bear 20 ~ 40W, this category of the speaker is not very suitable for broadband mode and AC-3 System. In many of the speakers are using ordinary small power speaker frequency response not uniformity, distortion. In-band mode, the tone of the dialogues, distortion, a hoarse and feel, sound and image are erratic, such as a picture object move from left to right, sound like a move feel awkward and unnatural. In addition, in order to create sound feeling, some central speaker impedance, or less than 4 Ω, extremely easy to damage the amplifier. So the choice of speakers must be careful.
In the actual trial, if they feel the sound is very noisy, the trouble with most likely out of the box, you can place the AV amplifier, the phantom model better results, you can verify this conclusion. Impedance, see Tips for 8.


In

1. surround speaker selection tips
Surround sound effect is the increase in the sound field of surround sound like Telepresence, before and after the move, the guarantee of the continuity and smooth transition. Surround speakersThe smaller mass General, it is a sound field diffusion, requested speaker has a wide nature, or to have flat power response.




Surround speakers in many of the illnesses and similar in sound, should also pay attention to the time of purchase.
　　
Home THX surround sound requires a two-pole speaker, the speaker has two radiation direction, direction angle of 90 ° ~ 180 °, radiation does not point to the audience, and the use of reflection, the walls are very good diffusion sound field.
Dolby Surround directional logic, frequency response range 100Hz-7kHz, AC-3 surround the whole band. So the best buy around the speakers choose broadband segment speaker for later upgrades available.



2. pick the skills of the senses
Buy speakers that also need to do to the eyes, ears, hands to the to:
　　
Eye to: need to see the speakers look will be free from defects on the surface decoration of skin at the corners and seams are obvious on the surface at the blistering or rugged, etc. Note the distinction between epidural ball treble and plated with metal layers of plastic diaphragm treble the distinction between domestic plastic diaphragm treble poor performance, a sound sense of Burr, not strong, resistant to the treble of the diaphragm is usually not on a projection of reinforced strong patterns.
Hand to: OK a weight of just speakers, usually heavy on speaker cabinet box materials thicker or speakers use a relatively large magnetic circuit, some speakers speaker diameter looks great, but very small magnetic circuit, such speakers to listen to the voice of turbidity, down the bass is small, the treble highlight harsh, weight relatively light. In addition, some manufacturers behind the speaker or preceded by a thick (some thick up to 20mm) wooden, PVC decoration outside onto the film, let people create the illusion of a thick sheet (actual plate thickness can be very thin), such speakers generally lighter in weight, as long as the brand-name with the same specifications as a contrast to the speakers. Bass speakers, stretched five fingers are evenly spaced across the cone Cone, touch, look at the soft, supple description field sound converter fO a lower, there may be a better low-frequency response. Then press a few speakers, the outer ring of rings (for rubber edges), quick release, poor quality discount ring "pop" sound. Loudspeaker rings also use polyurethane foam, bass to a rubber-ring soft, sensitivity to higher, foam rubber ring surface than fold folded loop to rough, the service life is lower than the rubber off ring. Cloth impregnated rubber-ring bass speaker sensitivity is high, but distortion relatively large, fold-made cloth impregnated rubber ring speaker especially evident.



Above these distinguish mere summary judgement, not absolute. It is a good idea to take the actual ear to listen to be compared. To make a comparison of the reference brand product will be of benefit.

　　

3. identify the reference configuration

And select AV amplifier, select product for reference is a very effective way. Currently on the market a typical home theater speakers are: Yamaha NS-30X, NS-5X, NS-10M and NS-70 (above as the main speaker), NS-P50 (wrapping and Central), the Greek 5.1a (complete set), the Greek 3.1 (complete set), hermit FB Series (full set), C-LV Series (full set), Panasonic THX series home theater speaker (full set), Dr. AM10 JBLMR series, (satellite), muses AV-2 series, the little whirlwind of MB + BC series, etc.

　　
4. the speaker test of magnetic shield


Conditions in the room is limited, the Lord speaker and the speaker from the TV set in place. When the stray magnetic field kinescopes surface exceeds 1 Gauss, will make the image's color or graphic changes, thus it is magnetic shield is important, but outside magnet speaker of the magnetic field generated by the magnet is so strong, so the speakers must adopt magnetic shielded speakers. To achieve the same performance requirements, magnetic shielding speakers price than non-magnetic shielding of the speakers, some manufacturers to reduce costs, and still use the outer magnet speaker or magnetic shielding bad speaker, check for magnetic shielding. Inspection when speaker and television set side by side, the status will be set in a Blue State no signal, after some time (some speakers in the short time that ordinary people do not see the appreciable effect, after about ten minutes later, the impact will occur. So don't think that will sound and the TV set on it, you can visit the magnetic shielding effect speaker), color (especially in front of the television picture tubes in the four corners), the magnetic shielding compliant, or non-magnetic shielding or possible magnetic shield does not meet requirements. Of the speaker of the higher magnetic shielding requirements, main speaker requirements can be reduced, so the main speaker system can also be placed in the sound field allowed from TV is distant place inspection.

　　
5. When you want to buy imported sound fake


The domestic market has many of the speakers is standard, some manufacturers use consumers ' imports of superstition, speakers for hands and feet. As domestic manufacturers registered trademarks abroad, domestic production, export and then entering the market, or outright to fake brands, grandly production sales, such speakers with speaker uses a patchwork of domestic KD, look in the rough, and high-frequency distortion significantly more weight bias. There is a differential method for consumers, typically woofer of ring external, import logo on the model, not the label made in China or dimension greater than imported parts, such as 6.5 speakers imported parts will mark the words EC-141, domestic speakers more 158,160, 8 inches speaker imported parts will mark the words EC-178, domestic more than 200 speakers, etc. So the purchase of imported products should choose credit higher agent shop purchase, if found, should please help identify knowledgeable people, beware of cheated.


The following

1. learn to see the speaker's index

BR > the current speaker of the target mark not too uniform and specification--
　　
First of all for impedance, usually 6-8 Ω, preferably with a multimeter actual measurements of DC resistance RD, impedance calculation value RD× (1.1 ~ 1.2). Some speakers nominal 8 Ω impedance, whereas only one of several ohms, extremely easy to make amplification frequent protection and corruption. These speakers do a pretty nice appearance, it is tempting, don't want to be careful.
Speaker's power is actually a reliability index, it refers to the standard power under load for a period of time without damaging the power, does not necessarily mean that the bigger the better sound power, not to mention many speakers marked not rated but maximum power. General use better 6.5 speakers speaker, rated power 40 ~ 50W, 8 inches speaker is 60-70W, use two power doubles.
The sensitivity of the homemade speakers use 6.5 speakers, generally used for about 86dB 2 around, with only 88dB 8 inches speaker 88dB around, using two only to 90dB, imported famous brand speakers on high 1-2dB. If you find the sensitivity label very high (higher than normal 3dB above), such as dual 8 inch speaker mark to 96dB, the indicators of suspicious.
For frequency response, look after the uniformity or decreased value, such as 40Hz-20kHz (± 3dB) or 40Hz-20kHz (-6dB). If there is no uniformity of value (± 3dB) or decrease (-6dB) annotations, the indicators have no significance.
Distortion values should be given a more loudly pressure test, known as 90dB or 94dB (home cinema in the test data of 94dB more stringent).
If the index is incomplete, there is leakage, the leakage of the project may be unsatisfactory, you should pay attention to distinguish.
Not just for the sake of cheap, don't buy no-name speakers is to avoid the trap of sound box.

　　
2. the speaker phase judgment skills


Home Theater set speaker phase should be consistent, but inconsistency, and with the presence of the speaker in polarity marked not standardized and inconsistent behavior, there are articles about using actual listening method, according to speaker phase contrast, low frequency sound will be weak and muddy features for judgment. But the actual operation, only some rich listening experience can quickly be judging, ordinary consumers use this method to determine the most extremely vague. If you are a multi-channel home cinema, including the reset, the situation is very complex, more difficult to determine. Here is a simple and accurate way, pick up a section of dry batteries, battery polarity quick add to the speakers terminals, two bass speaker cone will bounce forward or backward, forward, the batteries are of speaker terminals as speaker of the cathode, another post for the negative electrode. If backward, the batteries are of speaker terminals for speakers of anode, cathode for another post.



3. learning speaker DIY-related knowledge


Finally, it is recommended that you can understand some of the speakers made skills, so easily find speakers for unreasonable questions, contribute to enhancing the discernment, as have the opportunity to readers in the future for this class.