JM,
I have sooooooooo much METAL :twisted: stuff, I like to play Blues and such too (appeases my mum as well :)), and I KNOW the Painkillers sound soooooooo beautiful when split. NOT recorded yet (am still in Houston right now and stuff is shipped on way home) but the mid position on the Pet with Painkillers (inside 1/2 of both pups) through the Rivera is almost religious. Therefore I am pretty damn sure (as the Blackjack is 5 way switching, not just 3) they will shine in that too, and I already know they kick some serious HEAVY ass (also downtune well). Thats my thought anyway. The clean sound from the PK's was a very unexpected bonus tbh, but it's my thinking right now.
BTW, did a JM whilst here LOL. Dunlop Craybaby From Hell, Boss TU2, Cables, Slide etc. :) Get it whilst I can/it's cheap :) Oh and some M-Audio powered Monitors.