Also dial the low pass filter to max value on the subs when using your avr's bass management; sometimes one of the sub inputs will be designated LFE to do this automatically, but turning it up to max value is a good precaution (I briefly looked at a manual and it had two connection methods and one was an LFE input your sub doesn't have....that may have been a different incarnation of the PSW10 than you've got). As William said, there is usually a 6dB gain advantage if using both L/R inputs on a sub, but unless you're having issues with low signal from your avr, but this shouldn't be a worry with most.