CEC modifications - do they work?????

Hi

I have some experience with the CEC TL1x, Parasound cdp-2000 and Parasounds drive 2000. Sound are very similar to each and another, but they have a common weak side which I can not live with - bass production estimated between 80-120 cycle. My question is, have anyone experience with mods which can solve this problem???

Otherwise, I love the sound from these belt driven cd players. They're not detailed like a Sony, but I play horns, so I do not care.

Thanks, Tadman