i've got the same player, and if i'm not mistaken you can't access the correct menu to setup the bass management if the disc is currently playing; you have to hit stop first. i'm at work tonight so i cant rush and give you a definitive answer but i can get you one by 0900!
p.s.- it really is a good player, especially for only about 120 bucks!
oh, another possibility is that there's just not any sound low enough on the disc to make it below the crossover and to the sub. you might want to play the test tones on the 2805 to make sure the sub comes on first, verify the crossover freq (for you 80hz is about right), and also check the indications on the front of the player to make sure everythings kosher.
