After using my GT1000fx for years, I recently drug my old ART SLA-2 out of the closet that I haven't used in years. I was surprised that I actually preferred it to the Matrix because the low end seems to hit harder. I think the issue is the Matrix has a small switching power supply so it can't bring those huge low end spikes. The ART has a huge ass transformer in it, which I assume can provide more power for big chugs.