I set sats as Small and only Center as Large. Rest, crossover was set at 65hz! On certain tracks using Foobar with channel mixer plugin i am getting popping and crackling sound from woofer. Only at high volume levels say 85%. Previously, this wasn't happening. Yes, system is connected through Analog. I am using latest drivers for Xonar as well. Ok, i'll go with what you're saying. If you're using Z5500 with xonar as well then could you post your settings for movie and music playback. I am using Foobar for music playback and MPC-HC x64 for all movie formats playback. Post the settings any way, so that i can tell you my experience. Let me know, if you want to see my settings screen shots. Its just i haven't been experiencing the crackling sounds from woofer before. Is it because of Foobar channel mixer plug in or because of normalization level in MPC HC? Should i try checking sound via laptop?