I have the following system: Onkyo 595 Twin SVS CS+ with s1000 amp The bass is great on DVDs but I noticed something while watching Star Wars on VHS. The bass is obviously much less because it is on VHS. The thing is that the bass is much greater while the reciever is set to "all channel" than when it is on "pl movie II". I assume that pl movie II is surround and all channel is not. Is there a reason why the bass is much greater on all channel. It really sounds great! I do have the Cinema RQ switched to off.