Haven't had my Red Stripe long enough to dial in, but so far I can't get it past 2 on the MV before things in my house start to fall apart. From what I read, anything past 3 is useless in most situations (so I've read- and believe). At some point in my life, I'm going to crank that thing, just to say I did it. Speakers be damned. Could blow old speakers, but I wonder if it would break in new speakers more quickly...?
Related note, I read that while recording Whitesnake's 1987 album, John Sykes slaved one Red Stripe Coli into another then dimed the volumes. No idea what kind of earthly cabs could handle that...