British Audio is the best in the World and In Phase have made beautiful sounding amps for many years. Bass is always difficult to get right as the Amp has a mammoth task of moving and controlling speakers of such size. The IPA2001D Class D Digital Mono block is the best of its kind, it will get the best out of Any Subwoofer and its 1 OHM Stable. Remote bass gain included. 800w RMS x1 @ 4 ohms, 1200w RMS x1 @ 2 ohms, 2000w RMS x1 @ 1 ohms, 4000 Watts Max Power, Regulated power supply, MOSFET power supply, Oversize Power Transformer. Bipolar Output devices, Variable gain adjustment, Variable cross over (high/low pass), Thermal protection, Overload protection.