Can you access the service menu and adjust the Bass in the dac settings? I've just got an A729 and raised 50Hz from -4.5 to 0. Might be worth seeing what settings your player has.
In fact it sounds similar to the issue I was having with the NW A3000 eq, the lowest slider boosted frequencies that were higher than the lowest it was producing so while it made some songs sound better, others like Unfinished Sympathy (the 1st bass kick especially) didn't sound as pleasant without the natural bass. I'm pleased with the A729 in that sense as the Clearbass does affect these lower frequencies.
Last edited by Deders; 09-28-2012 at 08:38 PM.