How exactly does the gain knob on subwoofers work? - AVS Forum
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post #1 of 6 Old 07-09-2012, 11:10 AM - Thread Starter
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Every time you raise it by a numbered increment, does it just raise it by a certain # of dbs? Thanks, trying to figure something out!
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post #2 of 6 Old 07-09-2012, 11:13 AM
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Depends on the sub but usually not; that is, there is no standard for dB/number. Many AVR controls are calibrated, however.

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post #3 of 6 Old 07-09-2012, 11:21 AM
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It's just amplifying the voltage given to it by the pre amp or receiver. Ideally your pre amp has enough voltage headroom that it isn't clipping the output signal which then would send a clipped signal for your sub to amplify. You should ideally try to keep your level on your receiver in the -2 to +2 range and then adjust your sub amplifier knob to get your desired output
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post #4 of 6 Old 07-09-2012, 01:05 PM
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Quote:
Originally Posted by DonH50 View Post

Depends on the sub but usually not; that is, there is no standard for dB/number. Many AVR controls are calibrated, however.

+1.. AFAIK, there's no standardization even as to whether manufacturers use linear potentiometers or log scale. When you have a linear control at one half, you have 3 dB more to go. Almost all the usable part of the control is in the first quarter turn (only 6 dB - - most folks would say 2 notches louder or quieter) are above the quarter turn point.. Makes things seem powerful because they are loud at low settings, but also makes precise setting more difficult than it ought to be, especially if you're in the forst quarter turn. When you have a log pot at one half, you are at 1/10 power (roughly/theoretically, ignoring tolerances etc) meaning you are half as loud as it will be when you turn it up all the way.
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post #5 of 6 Old 07-10-2012, 04:29 AM
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Quote:
Originally Posted by omegaslast View Post

It's just amplifying the voltage given to it by the pre amp or receiver. Ideally your pre amp has enough voltage headroom that it isn't clipping the output signal which then would send a clipped signal for your sub to amplify. You should ideally try to keep your level on your receiver in the -2 to +2 range and then adjust your sub amplifier knob to get your desired output


This is about to sum it up. The gain control on a powered sub works the same way as on an power amps, but unlike those amps especially pro amps the markings are different, which could create confusion.However it's primary role is to aid calibration so I guess the numerical markings would act as as a point of reference for that process, but I wouldn't use it to determine any meaningful acoustical power by it however.

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post #6 of 6 Old 07-10-2012, 02:11 PM
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Quote:
Originally Posted by omegaslast View Post

You should ideally try to keep your level on your receiver in the -2 to +2 range and then adjust your sub amplifier knob to get your desired output
If Audessey calibration is used, from what I have been reading, raising the sub knob is NOT recommended after Audessey set up.
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