RD HW/SHW (Ran an alpha max on 3300 clamped rms for a year and sold it still fully functioning, My Solo X 18D2 laughed at an RD D9 @1ohm and managed 148.8 with music 153 @ 34Hz burp (TL/Dash), Ground Zero Plutonium, Treo SSX is nice, AA Mayhem's are pretty tough as are BTL's. ATomic APXX's seldom fail if the power is clean, A Sundown NS could be built up, Ssacket could build you a daily monster, TC 5200/5400/LMS Ultra DD 9518g's we used took 4800 daily for quite awhile, they did eventually breakdown though. I played with a HDC3-A 15 and it took 3K like it was playing around (144.4 @ 24Hz headrest termlab,) we burped our coppers on 5K each without failure (152dB headrest termlab 36Hz) We burped our IA DP's @ 9800 clamped per (154.7 @ 36Hz headrest/termlab) broke a glue joint here and there, lol, but they'd take 4K easy as pie. The DC Level 5's seem to take as much as you can throw at them. The TSNS (if you can find one) would be a wicked beast as well.