BAT VK-225se power amp, and all I can say is WOW!
Bass slam, grip, and control are simply astounding
Comes from having a great power supply and bi-polar (BJT) output stage able to deliver big current when needed, even into low impedances.
"BAT: Bipolar transistors in its discrete Class AB output stage. Each channel uses six high-power bipolar output devices, boasting a combined rating of 1380 watts."
Cheers George