AudioControl SA-3051, Руководство по эксплуатации

Страница: 26 / 38

SA-3051/SA-3052 Operation Manual
3. Microphone Placement
The CM-10 microphone that comes with the SA-3051/52 utilizes an omni-directional capsule, use a
microphone stand to hold the microphone at ear height (sitting) in each of the listening positions. Don’t
place the microphone on the top of the couch or use a pillow to hold it, as this will affect the measure-
ments.
4. Setting Levels
Put the SA-3051/52 into the digital SPL mode and match the output levels of the by using the output level
controls in the surround controller. Use the surround test tone one channel at a time. The owner’s manual
of your surround processor will have more information on this.
5. Equalization Guidelines
The overall goal of equalizing a home theater is to have a smooth transition from one third-octave band to
the next with no greater than 3 dB of variation. You also do not want to use your equalizer to re-invent the
laws of physics and try and make a speaker do something it can’t.
Although the audio police will not hold you accountable, you should follow some guidelines when it
comes to making equalization corrections:
• Your equalization curve will be the inverse of what your analyzer displays.
• Cut the peaks before boosting the dips.
• If the analyzer shows a 3 dB bump at a given frequency, you should cut the frequency 3 dB.
• After making initial equalization adjustments, re-analyze the system and adjust again if necessary.
• When in doubt, re-analyze and re-equalize a particular speaker or group of speakers.
6. Left, Center, Right (LCR) Speakers
In this step you will want to measure the frequency response of each speaker at each listening position
and then average them together to achieve a spatial average of the listening room. Set the SA-3051/52
display to 2 dB per step with the speed set on Slow Averaging (20 second averaging). The system volume
level should be set at a reference position of approximately 90 dB and pink noise should be used as test
material.
Starting with the center channel, use the following procedures:
a) Take a measurement in each seating position and store them in memories of the analyzer.
b) Average the measurements of each seating location.
c) Following the Equalization Guidelines, make the appropriate equalization corrections to the
frequency response.
d) After making equalization corrections, repeat the above procedures.
After you have completed the above steps, repeat them for the left and right channels. Disconnect the
channels you are not equalizing by unplugging the RCA connectors for the appropriate amplifiers.
7. Subwoofer Equalization
To measure and equalize the subwoofer you will want to follow the same procedures as you do for the
LCR speakers. However, because of the omni-directional nature of bass at lower frequencies, it will not
be necessary to take subwoofer measurements at all of the various seating locations.
8. Splicing The Subwoofer
There tends to be an occurrence of peaks or dips at the point where the subwoofer and the main LCR
speakers overlap, generally around the crossover frequency (80 Hz). It is important to smooth out this
transition point.
Center Speaker Splice: Disable all channels, except for the subwoofer and center channel. Play pink
noise through them and use only the center channel equalization controls to smooth out the splice between
the subwoofer and the center channel.
L & R Speaker Splice: Disable all channels except for the left, right, mains and the subwoofer. Play pink
noise through them and use the left & right channel equalization controls to splice in the subwoofer.
5-3