After chatting with some fellows over at DIY Car Audio, here’s a few other high-end selections worth considering.
HELIX DSP.2 / LINK HERE
Pioneer DEX-P99RS / LINK HERE
ZAPCO Amps / LINK HERE
Specifically the ST-D (class D), Z-AP (SQ amps) and Z-SP (take a beating) lines.
Check out Stevens Audio on Facebook.
Sundown Audio / LINK HERE
Raven Design Studio / LINK HERE
These come highly recommended.
10XL and 12XL Versions