My friend just replaced his 20 year old Harmon Kardon with an Onkyo 600. He has some polk speakers that are about 12 years old. They are larger than bookshelf speakers but not towers. It seems that now he does not have as much bass as he had before with the HK. All of the speakers are set on large and he does not have a sub. I tried the crossover at 80, 100, and 120. It is not on night mode. Is it possible that the Onkyo is so much more clean that the bass is just not as boomy? Also I bet his old reciever did not even have a crossover. What should he set this one too and is there less bass because he has a crossover? Thanks!!!