I am new to this forum and would appreciate some advice. I am not new to the a/v world, but I am in know way an audiophile. I just purchased a Marantz 6200 receiver and have it running my Polk psw-150 powered sub (200 watts/10" sub). My previous receiver was a Technics SADX-930. Of course the Marantz runs cirlcles around the Technics except when it comes to the sub output (t.v./movies) . I only used one channel on the rear of the sub and had the sub volume turned only half way when it was hooked up to the Technics. Now that I have it hooked up to the Marantz I have the sub volume turned up 3/4 and am using both channels on the rear of the sub. I also have the sub level on the receiver set at 10 out of 15. I've read reviews about this sub that said it's not good at producing room shaking bass, but it did pretty well when hooked up to the Technics. I know that speakers will sound different with different audio equipment, but I surely thought that the Marantz would have this sub moving out of its stationary spot without me having to turn all of the levels way up. I have the crossover on the back of the sub set at it's lowest point which is about 50hz. It does pretty good with music, but t.v/movie sub output is seriously lacking. I am still learning this receiver. Is there something about the Marantz that I don't know or do I have to buy a better sub. Is there anything that I can try to increase the output. Thanks.