Hey guys, I'm having trouble getting my sub woofer to sound good with movies. When I play music, the sound is great and the sub woofer thumps and can shake the walls if I turn it up, but at the same or lower volume levels the sub rattles when reproducing bass from movies. I have tried adjusting settings and just don't have the "know how" for frequencies to get it sound right. Equipment - Receiver - Sony STR-DE675 Speakers - (allTechnics) center - SB-C22 8ohm 160w music / 80w DIN front - SB CR33 2 way 8ohm 140w / 70w rear - SB S29 8ohm 80w / 40w Sub woofer -Sony SA-WM20 active sub I have read and re-read the stereo manual a number of times making sure I have checked all the settings. And there are a lot of settings, small/large speakers, distance to listener, balance, level, not to mention all the presets for multi-channel surround. The settings on stereo specifically for the sub are - 1. Sub woofer level (from -6dB to +6dB) 2. Low Frequency effect - attenuates the level of the channel output from sub without affecting level of bass frequencies sent to sub from front/center/surround channels via the bass redirection circuitry. (from -20dB to 0dB. At 0dB outputs full LFE signal at mix level recorded) Selecting off mutes the sound of the LFE channel from the sub. Two other settings I don't fully understand are Dynamic range compressor which I just have set to OFF, and Front speaker bass adjustment 99Hz to 1.9 kHz which I assume doesn't effect the sub woofer. The sub woofer itself has three adjustable settings - 1. Phase - Normal / Reverse 2. Cut off Frequency 50Hz / 200Hz 3. Level - Min / Max I have set the stereo sub level to -6dB and the cut off to 50Hz and turned the level all the way down. I have tried the other settings without getting + results. I'm just not sure what to do. I cannot justify buying a new stereo as this 5.1 is plenty capable for my needs, and I do not want larger speakers. I'm hoping I don't need a new sub and given the fact that it sounds fine with music I doubt the problem lies with a broken part. edit - the rattle is deff coming from the sub and nowhere else. And if it matters, the speakers are wired directly from the stereo and not from stereo to sub to speakers. Thanks for any help.