Judging by what the OP has writen so far I would dismiss hearing loss and attibute it to tone settings. I had an LH500 and it was not muddy at all. I was at the time using a passive Jazz bass and it was clear as can be. I always had the bass at 0, mids full, treble at 2(close to flat for a Fender tone stack). The sansamp is going to seriously affect your sound as well. You need to cut with that preamp rather than boost to get it sounding clear.
Gotcha. I need the BDDI more for a volume boost. The 62 Jazz is too quiet. If I put it straight into the head, I have to pump the volume. I'd rather not do that. I'll set the knobs where I've been instructed, then add in the BDDI. But instead of relying on it I'll try to cut it as much as possible. It'll be a fun day of level adjusting

