Originally Posted by DonH50
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.