i would say it made the sound livelier. And a lot of the little instruments being played are also accentuated. The amp is plugged in to the bp unit then to an inexpensive sinewave ups. But no ultimate outlets or bybee stuff. The zero autoformer is intriguing though.Do you know of any tube amps for the car like milbert without the price tag ? There's a diy trans for car tube use I found but that's about it:
http://www.audiohobbyist.com/projects/smps.htm