Originally Posted by cel4145
That means you have the gain (volume) on the back of the sub set to high. You need to turn the sub down such that Audyssey sets the channel (trim) level for the sub much closer to 0.
Like I mentioned earlier, just got my PB12...but while I was waiting, I read tons on these forums. Below is a really good explanation from Ed at SVS regarding this topic...when I read it...it all started to make sense. Hope this helps someone else...it sure did me.
"The final calibration level of the subwoofer is a function of the input voltage and the gain setting on the plate amp. If the input voltage is strong, then less gain is required at the amp. If the input voltage is weak, then more gain is required at the amp.
The gain control is not a volume control and it's important to understand that the amp can be driven to full power at less than the full gain setting, if the input voltage is sufficiently strong.
So we leave enough gain at the plate amp to accomodate a wide range of input voltages, and in most cases with typical consumer AVRs, the required gain setting to achieve correct subwoofer calibration will generally fall between 11 o'clock and 1 o'clock.
In order to send the subwoofer a nice clean signal from the AVR sub-jack, we recommend running the sub channel level somewhere in the -5 to 0 range. Most AVRs will start clipping the sub-out signal if the sub channel level is pushed too far into the positive region.
If you are running an auto set-up AVR, set the gain around 12 o'clock and then run auto set-up and then check the sub channel level in the AVR. It should fall somewhere around -5 to 0. If it's way outside that range in either direction (particularly if it's a high positive setting), then adjust the gain accordingly and re-run auto-set-up. This is an iterative process, but it usually doesn't take more than one adjustment to get an optimal AVR sub channel level along with the correct sub calibration level.
Director - Technology and Customer Relations