Hifonics HFEQ-2 4-Band 1/2-DIN Equalizer/Crossover

The Hifonics HFEQ-2 is a compact 4-band car audio equalizer and active crossover designed to give a multi-amplifier sound system more hands-on signal control. It fits between compatible line-level source outputs and amplifiers, allowing the user to adjust tonal balance, output levels, and crossover points from one central processor. It is intended for custom car-audio installations rather than as a replacement radio or speaker amplifier.

This processor is a practical choice for listeners who want to refine bass, midrange, and treble response beyond the adjustments available on many source units. Its four EQ controls operate at 45 Hz, 120 Hz, 2.2 kHz, and 12 kHz, covering sub-bass, mid-bass, midrange, and treble regions. The controls allow up to 18 dB of cut or boost for system tuning.

The HFEQ-2 supports two stereo unbalanced line-level input channels, allowing selection between two connected audio sources. Input-level controls help match the processor to the source unit's line-level sensitivity, while the master volume control adjusts overall audio level. A separate subwoofer level control provides convenient adjustment of the subwoofer output level.

For systems using separate amplification, the HFEQ-2 provides front, rear, and subwoofer output channels. The front and rear outputs use high-pass filtering, while the dedicated subwoofer output uses low-pass filtering when the crossover is engaged. A front-to-rear fader and a stereo/mono subwoofer-output selection add flexibility for common multi-channel system layouts.

The processor uses a 1/2-DIN chassis that can be installed in the dash or under the dash using the included mounting hardware. Its illuminated control knobs can be set to red or blue to suit the vehicle interior. With a maximum output voltage above 9 volts and a specified signal-to-noise ratio above 100 dB, it can serve as a signal-management upgrade in a compatible RCA line-level car-audio system.

Key Features

• 4-Band Equalizer: Adjusts sub-bass, mid-bass, midrange, and treble response.
• Two Source Inputs: Selects between two connected stereo line-level sources.
• Active Crossover: Separates high-pass front/rear and low-pass subwoofer signals.
• Three Output Zones: Provides dedicated front, rear, and subwoofer outputs.
• Subwoofer Level Control: Lets you adjust bass output from the processor.
• Selectable Knob Illumination: Switches illuminated controls between red and blue.

Design & Installation

The HFEQ-2 uses a compact 1/2-DIN chassis with illuminated front-panel controls and gold-plated RCA-level input connections. It includes a dedicated power, ground, and remote-turn-on connector, along with mounting brackets and mounting hardware. The design places the primary level, fader, input-selection, EQ, crossover, and illumination controls within reach for system adjustment.

Install the unit in a location with adequate clearance, such as under the dash or in a compatible dash opening, and test connections before final mounting. Connect it to a constant or switched +12V source using the provided 1-amp inline fuse, a clean chassis ground, and a source-unit remote or antenna lead. Use its line-level inputs with compatible source equipment and route front, rear, and subwoofer outputs to the corresponding amplifier inputs.