I have a Rotel RSP-1066 and the crossover is set at 80hz. Since I've owned my sub, I've set the subwoofer frequency cutoff at 80hz on the back of the sub. I've since learned that it may be better to set the subwoofer's frequency cutoff on the back of the sub to 150hz (maximum setting) because I'm letting the rotel perform the 80hz cutoff. Since I've done this, it appears to sound better, however I still need to do more listening. Which way is correct? Thanks for the info!!!