8V? oh really. i know Memphis M class and up will take up to 10V rms. most will only be readily able to take 6V maybe 7V rms but sending the amp slightly more pre-amp voltage won't hurt anything unless it's drastically more.
Yeah I remember Eclipse doing that and people looking for amps to match. Dunno if anybody ever found one. A post above mentions Memphis but I don't see any specs on their amps' sensitivity range.