Well, that email is long lost, but tonight it occured to me to try it out AND THE TONE WAS MAGIC!!!!!!!!!!! I had started to get disillusioned with my amp a little, and I normally only play at 'room' volume, and the difference was absolutely amazing. It changed it's character, the amp really came alive, and interestingly my duncan custom - which I normally think is too piercing - sounded just right. The tone seemed to change; high presence lost it's shrillness.
The clean channel was much better dirty than it used to, awesome crunch and blues sounds, and the lead channel - which used to be a bit of a single sound chanel, and unuseable below 6.5 - had the greatest brownest sustaining touch-sensitive usable distortion at gain 3!!!!!!!
I couldn't stop playing. Having the power stage working hard really seems to be the secret with these amps, I'll be leaving it like this for a while
Just thought I'd share. I'll email Boogie to double check that I've done it right, because I'm not 100% on the changing-speaker-impedence thing.
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*disclaimer: this is just from my memory, so I take no responsibility if you try it on your DC-3. IIRC The tubes won't last as long either.