The Devil
IHTFP
I have nerdily put my stylus on the run-in groove and tapped the plinth of the LP12, as penance. With the preamp on full volume, a faint "bonk"-style plinth-tap noise was audible through the speakers. Audible acoustic feedback is not really going to occur with an LP12. Mana still has an effect, apparantly, when the hi-fi bits are in a different room from the speakers. I don't find that surprising, but many people do.