Excalibur X1100.1 Mono Car Audio Monoblock Power Amplifier 1000W RMS at 1 Ohm 720W 2 420W 4 Variable Low Pass Subsonic Filter Bass Boost and Phase Control for Subwoofers.

True Class-D Monoblock Power: Delivers 1000W RMS at 1 Ohm, 720W RMS at 2 Ohm and 420W RMS at 4 Ohm — honest continuous ratings matched to real subwoofer loads Adjustable Low-Pass and Subsonic Filters: Low-pass spans 50–250 Hz for clean sub integration; subsonic filter (10–50 Hz) removes infrasonic waste and protects your driver Flexible System Integration: Variable sensitivity from 0.2V to 6V pairs with factory radios or aftermarket head units; selectable 0/180-degree phase aligns bass timing precisely Clean Signal Baseline: THD below 0.2% and signal-to-noise ratio exceeding 90 dB keep bass reproduction accurate and defined even when pushing the amplifier hard at volume Compact, Protected Chassis: Measures 233 x 184 x 55 mm for discreet boot or under-seat install; dual 45A fuses and internal thermal protection ensure safe, reliable long-term use