Crunch GP-3500.1D 3500W Monoblock Car Amplifier

The Crunch GP-3500.1D Ground Pounder is a mono Class D car amplifier designed to power a subwoofer system. It provides a dedicated low-frequency amplification channel for vehicles whose factory or aftermarket audio system needs more bass output. Its compact chassis helps make a dedicated subwoofer upgrade practical in a wide range of vehicle installations.

This amplifier is intended for listeners building a mono subwoofer stage rather than powering full-range speakers. Manufacturer-listed output is 875 watts at 4 ohms, 1,750 watts at 2 ohms, and 3,500 watts at 1 ohm. Select a subwoofer or subwoofer wiring configuration that presents a safe final impedance for the amplifier.

The GP-3500.1D uses a variable electronic crossover with a 12 dB-per-octave slope to help blend a subwoofer with the rest of the system. Its adjustable low-pass filtering and 10-40 Hz subsonic filter allow the bass range to be tailored to the enclosure and vehicle. A 0-180-degree phase adjustment can assist with system integration when bass response changes at the listening position.

Crunch equips this model with a high-energy pulse-width-modulated power supply, SPEED-FET MOSFET output devices, and a QTD aluminum heat sink. These elements support the amplifier's Class D architecture while helping manage heat in a compact 11.5-inch-long chassis. Low-noise preamplifier circuitry is used for low-level source signals.

The GP-3500.1D can accept RCA low-level inputs or speaker-level inputs, making it suitable for many aftermarket and factory-radio upgrade paths. A wired bass remote is included for convenient bass adjustment from the cabin. It is a focused solution for adding a dedicated subwoofer amplifier to a car audio system.

Key Features

• Mono Class D Design: Provides one dedicated channel for a subwoofer system.
• 1-Ohm Stability: Supports manufacturer-rated operation down to a 1-ohm load.
• Variable Electronic Crossover: Helps set the subwoofer's operating range within the system.
• Adjustable Subsonic Filter: Offers 10-40 Hz filtering for enclosure-aware setup.
• RCA And Speaker-Level Inputs: Supports aftermarket radios and many factory-audio integration paths.
• Wired Bass Remote: Allows convenient bass-level adjustment from the driver's area.

Design & Installation

The GP-3500.1D has a black-and-red aluminum QTD heat-sink design with nickel-plated brass connection terminals and screw-down connectors. Its Class D layout, SPEED-FET MOSFET output technology, and pulse-width-modulated power supply are engineered for subwoofer amplification in a relatively compact footprint. LED diagnostics provide visual indication for overload and speaker-short protection.

Mount the amplifier securely in a location with adequate ventilation and do not install it upside down. Use 4 AWG cable at the power and ground terminals, up to 12 AWG speaker wire at the speaker terminals, and the specified 30A x 2 fuse arrangement. Connect by RCA or speaker-level input as appropriate, set the low-pass, subsonic, phase, and bass controls conservatively, and verify that the final subwoofer load is no lower than 1 ohm.