I'm sure that the people using inverters, including myself, are not going to switch to dc-dc ps's. I'm sure there still has to be away to get rid of any inverter noise, if there's any at all, depending on your inverter.
I know that I can cancel out a dying alternator for engine whine because my car is brand spankin' new. Today I'm going to sand and polish the grounding spot and see if that makes a difference.
Update: Well, I did a bit of rewiring and fixing up ground points and whatnot, but still had the same old engine whine and slight hum. I went to radio shack and bit the big one and bought the ground loop isolator. No whine or noise at all. I'm extremely excited and best of all, I don't hear any lose of sound quality (but then again, I don't play my music at ear bleeding levels).
[This message has been edited by blkdragon6 (edited 11-02-2000).]