Quite curious on this one. I used to own this reciever and used this output for my subwoofer. I'm thinking thats why my Mirage BPS-150i is fried. I could never turn the input gain on the sub up much past 2 without it bottoming out. Would this be a millivolts thing? Any suggestions on technical/specs and purpose on this "mix" output would be much appreciated. Since I bought this sub as a demo in June of 1998 I have always had this problem. I did take it back twice in the first year to get the drivers replaced. The voice coil and drivers were seperating. This time around I mentioned a problem with the input gain and sure enough it needs replacing. I thought I had a 5 year warranty on it but since its a powered unit Mirage only has a one year warrenty. I was quoted at $300.00 to fix this and since its $700.00 street and $1000.00 for the BPS-400 I'm considering my options. Thanks in advance.