【 Weak current College 】 sound fundamentals — woofer 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. The following are the methods:

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.

The following are the specific steps:

1. put your entire room floor with sticky tape to stick into many 0.2 square meters (approximately 20 cm × 100 cm) chunks. These block Division is completed, your listening position can test in these blocks. If you fear that this will leave the tape on the floor, you can select those that will not leave imprinted tape.

2. create a table to systematically record you in each region to a woofer speaker feel. IfIf you do not have a record of these data, you can easily put you in each region to feel forgotten.

3. If possible, use these to listen to the block in the seat moved to two woofer speaker placed in a listening area Center, room the longest side of the Centre axis.

4. two woofer speaker gain downwards, and set their phase is set to 0 °, the balance of the decoder is set to the location of the "flat", you will test the music through the left, middle, and right channel speaker playback, raising two woofer speaker gain, until you hear the sound in the mix of their sound. And then to gain increased a little, then downwards until you just heard they appear when the mix sounds. Don't worry, the latter will be the final fine-tuning: now you have to do is to get the woofer sound reasonable, effective for the playback volume. Once the volume settings, close all the channels. When we assume that the woofer speaker of frequency points set to 80Hz or near placement.

5. put your CD or DVD player is set to loop, and then on every block, listen, record your hearing experience.

You'll notice that in some areas, a sound sense of balance than other chunks. In your record in the table. Once you are in each block, go after the audition to the front, you have chosen good along the axis of the direction to move the sub woofer speakers farther away from the wall. Then, in the room of each location and then listen again, a record of each block of feeling, note which chunks of audio sounds especially good or bad. Not much time, listen block sound good and bad mode will come out. Repeatedly for the above process until your woofer speaker set-up of audio satisfaction. Finally, write down every woofer speakers to listento the best of the chunk. From your records of a table, you will find the woofer speaker's best location.

6. find a room in sound best chunk, the woofer speaker moved some locations, additional listening test. This time, then go to the original hearing range of block, then you will find that move the seat location will be improved in a listening area where the sub woofer speaker sound. If you are a wall or other object of the limit and the location of the seat cannot be moved, you can skip this step.

7. Once you have found a woofer speaker and listen to the location of the "best" location, and then put all the channels are open, and then adjust the gain of the woofer speaker. Mortgage off sticky tape.

4. adjustment of the crossover point

8. in step 4 of 80Hz mentioned in the low-pass filter frequency frequency for your sound system is the best crossover point. But if you need to resize it, or to adjust the crossover point interested, below is some find new crossover point shortcut method. To complete this task, you need to be the main speakers and subwoofer speaker system is up and running. If you plan to put the main speakers are set to "high" mode, it is necessary to set them to this mode.

You sit in the listening position, so that a helper will be decoders subwoofer speaker low pass frequency downward until you hear the woofer speaker and master speaker's voice clearly separated from each other. Then let your assistant to woofer speaker low pass frequency adjusted upwards until you feel a woofer speaker and master speaker voice perfect combination to achieve a smooth transition.

I used to use music and pink noise signal successfully completed the above steps. Once you set up the best color separation point and sound effects, and then moved to another seat, repeat the above procedure. This way you will find a comprehensive sound best crossover frequency. When you enter the balancing stage, you will find the necessary adjustments to the crossover point.

5. phase delay time adjustment/

9. you may find that the adjustment phase settings (usually in the woofer speaker adjustment, if necessary, can also be adjusted on the decoder) will cause the primary speaker/sub woofer speaker integrated sound more balanced. Test will immediately display is improved: you can be in a certain phase to hear more or fewer low-frequency. Change the phase you hear listening room acoustics sound effects arising both sides, so that you are listening to the location of the sound effects will be different. To carry out phase adjustment, you must clear this would bring joys and half results. Like I said before, you sit in a listening area where the audition of different, let your assistant to adjust a woofer speaker phase (the other one is closed), audition repeatedly until you get the best sound. Then another woofer speaker for the same test, you must first turn off the speakers. Finally, two woofer speakers are turned on, if necessary and then they are more adjustment, you will find this process using a different test software would be more helpful.

Despite the delay adjustment for different purposes, I still use it with phase adjustment back together, because when you adjust the delay parameter, you can also change the phase. Delay can be regarded as a system to display the sub woofer speaker or reduce the woofer speaker signal routing differences between electronic method. Delay adjustment to different objectives for the professional audio and home audio fields are frequently used. Some people find ignored phase settings, put the effort in the delay would be better organised. In the woofer speaker sound effects of the integration process, the delay can be used to make from the woofer speaker and main speakers at the arrival of direct sound to hear. Know the speed of the voice, you can quickly figure out a variety of positioning mode signal transmission distance of difference (so even if the delay of many), but how do you figure out how to figure the amount of delay in 39a? for this particular situation, suppose front woofer speaker and friendly speaker of a substantial mode enables its audio at the same time get to listen to the location. Calculation of sound from the left, Center, right, and the former woofer speakers to listen to the location of the time (in ms) or distance (in feet or metres). And thenThen calculate the rear woofer speaker delay.

For example, suppose your left and right, in front of the main speaker/subwoofer speakers from the listening position 5 meters, while the rear left overload listen subwoof position 1 m, 5m – 1m = 4m. Therefore you need to make the rear woofer speaker 4m delay. In this way, from the main left and right, front woofer in/sound and rear woofer speaker sound can also reach the listening position.

6. balance settings

10. the equalization. To make this adjustment should be particularly careful: it produces a sound problem may be solved as much, especially when the wrong application. Some decoders can do very well, but there's very bad. To know its limitations, and remember it balanced is the woofer speaker of direct sound instead of your listening room! in hands-on, there are several points to keep in mind. An equalizer is a frequency adjustment of electronic equipment, it cannot correct time acoustic problem. There is no analog Equalizer you can on the frequency response curve steepness of the curve in special for balance, so you can only put effort into making the frequency response curve flattened, or reducing the wave crest. Over the years, I have seen many do not use test equipment and set up an equalizer technology. The following are the most effective way, it is assumed that you are using a parameter equalizer. The equalizer in fine-tuning the woofer speaker when is the best device, it can adjust the woofer speaker's gain, bandwidth, and frequency. Together, you can effectively adjust the low-frequency spectrum. Here, you have done a lot of work, can effectively improve the woofer speaker and your sound system integration. You already know the room space. When your parameter Equalizer balanced scale is set to 0, playback your test software, to hear in frequency response has no wave exists. If you want, you can listen to the area of every seat is a such a test.

We first want to hear more charges of resonance. The main speakers and subwoofer speakers are set to open. Choose a proper band point, adjust the gain of an appropriate value, such as a + 3 to + 4dB and a higher balance value Q. And then slowly upwards, and reduce the frequency and size, you have to carefully find that gain the most obvious frequency point, you may need to do a few times. Once the maximum frequency gain results found, you will find resonance frequency. Slowly reduce the frequency of gain, until wave disappeared, replaced by a balanced and neutral sound. Now change the equilibrium q value until you hear the sound more natural balance. If necessary, adjust the gain value. On the other slightly low amplitude of resonance frequency and repeat the above process until you are satisfied. Now the individual listening zone seat then listen up.

The aim is to listen to the area of all seats, find the one you heard of acceptable frequency response of a compromise position. This might not make it. Instead, you can listen to the region can only find a seat can achieve acceptable sound. But to follow this approach, you can find the best performance woofer speaker set-up, and parameter settings.