Hifonics HCC-2500.1D Mono Subwoofer Amplifier

The Hifonics Colossus Classic HCC-2500.1D is a mono car audio amplifier designed to power a subwoofer system with dedicated low-frequency amplification. Its single-channel layout gives installers a focused solution for adding bass without using the channels intended for full-range speakers. The amplifier is specified for 625 watts at 4 ohms, 1,250 watts at 2 ohms, and 2,500 watts at 1 ohm.

This amplifier suits vehicle owners building or upgrading a subwoofer-focused system and needing adjustable bass-system controls. It can work with aftermarket systems through RCA connections and supports speaker-level audio inputs for integration options. A wired bass remote is included for convenient adjustment from the cabin.

The HCC-2500.1D is voiced and equipped for low-frequency duty, with a 10 Hz to 500 Hz frequency-response specification and a variable low-pass crossover. Its adjustable subsonic filter, bass boost, bass control, and phase adjustment provide setup flexibility for different subwoofer and enclosure combinations. The 0-180-degree phase control can help align the subwoofer's output with the rest of the system.

Hifonics uses its Super D-Class topology with Ultra-Fi MOSFET output devices and a low-noise preamplifier circuit in this model. The design also uses a dual-coil pulse-width-modulated power supply and an aluminum heat sink to support efficient operation and heat management. Total harmonic distortion is specified at less than 0.1%.

At 16.9 inches long, the HCC-2500.1D is intended for installations with adequate room and ventilation around the amplifier. It is a dedicated mono amplifier, so it is best paired with a subwoofer or subwoofer array wired to a final impedance supported by its published power ratings. Preamp outputs allow the signal to be passed to an additional amplifier when expanding a system.

Key Features

• Mono Subwoofer Output: Delivers one dedicated channel for a bass-focused speaker system.
• 1-Ohm Power Rating: Specified for 2,500 watts into a 1-ohm load.
• Variable Low-Pass Filter: Adjusts the subwoofer crossover point from 30 to 250 Hz.
• Subsonic Filter: Provides adjustable filtering from 15 to 35 Hz.
• Wired Bass Remote: Lets the driver make bass-level adjustments from the cabin.
• Speaker-Level Inputs: Supports integration with compatible factory or aftermarket source units.

Design & Installation

The HCC-2500.1D uses a heavy-duty aluminum alloy heat sink, Ultra-Fi MOSFET output devices, nickel-plated RCA jacks, and high-temperature, impact-resistant nickel-plated connectors. Its molded power, ground, and speaker terminals are angled for access and cleaner wire routing. LED diagnostics are included to indicate overload and speaker-short protection conditions.

Mount the amplifier securely on a surface with adequate ventilation, and do not install it upside down. Use the published 4 AWG power and ground terminal capacity, 12 AWG speaker terminal capacity, and external 150A fuse requirement as installation references. The main power cable should run directly to the battery and be fused within 18 inches of the battery terminal.