GP-1000.4

The Crunch GP-1000.4 Ground Pounder is a four-channel Class A/B amplifier rated at 1000W max power, delivering 4 x 125W at 4 ohms, 4 x 250W at 2 ohms, and 2 x 500W bridged. That is enough clean power to run a complete four-speaker system, or a front stage with the rear pair bridged to a subwoofer.

Four operation modes cover four-channel stereo, dual stereo bridged, stereo plus bridged mono, and dual bridged mono, so the amp adapts as the system grows instead of forcing a layout on day one.

High-level inputs are the practical feature here. They connect to factory head units with no RCA outputs, which means a stock radio can stay in the dash while every speaker in the vehicle gets amplified power. RCA inputs are also on board for aftermarket sources, with input sensitivity adjusting from 0.2V to 9V.

Class A/B topology with SPEED-FET MOSFET output devices keeps the signal path clean at high output, and QTD aluminum heat sinking adds mass to hold temperatures down through long sessions. Variable electronic crossovers run 12dB per octave, built-in bass control adds switchable 0, +6, or +12dB, and frequency response spans 10Hz to 22kHz.

Nickel-plated brass screw-down terminals accept 4 AWG power and ground with 12 AWG speaker wire, LED diagnostics report overload and speaker short conditions, and 30A fusing protects the run. The chassis measures 10 x 8 x 2.375 in at 6.25 lb in black and red.