Originally Posted by audiopunk
yep. Ran YPAO again each time.
Come to think of it. At the very beginning of the YPAO test, it made that noise again.
Also, it DID NOT make this noise when I first got the sub. That's what makes me think something is wrong :/
It is possible that something is wrong with the sub, but it's more likely a set-up and implementation issue. First, are you sure that you have the sub in the best position in the room? Did you do a sub crawl to determine where the sub should be?
From a setting standpoint, your trim level is too high for your master volume level. SVS has always recommended staying in negative trim numbers in the AVR as you approach -10 in MV. Recently, Ed Mullen has emphasized the desirability in staying well in negative trim levels, even at more conservative volume levels, to insure that the sub amp, and not the AVR amp is sending the voltage signal to the sub. The sub amp needs to do all the heavy lifting. This helps to prevent clipping or, in this case, port chuffing.
Here is what you need to do. First turn up the gain on your sub a little and reduce your trim level settings. Try to stay around -5 in your AVR, even if that means that you are -5 in gain on the Plus, rather than the -10 you are using now. Doing this may correct the problem of port chuffing, but if not, it will at least insure that you are doing everything correctly from a user-operator standpoint.
The reason I asked whether you had done a sub crawl is that sub position can be a big factor in performance, particularly as we try to push them a little. If using the proper gain/trim relationship doesn't solve the problem, and the sub is in the best position, then I think that you do need more sub.