Audio360 AD7500B Digital Bass Processor

The Audio360 AD7500B is an in-line digital bass processor for car audio systems that need more low-frequency detail and adjustability. It is designed to process a line-level signal before it reaches downstream crossovers, equalizers, or amplifiers. This makes it a practical addition for systems using RCA-connected source units and aftermarket amplification.

Rather than functioning as a conventional bass boost control alone, the AD7500B uses a dedicated digital bass driver circuit intended to restore low-frequency information in the program material. The result is a bass presentation that can be tailored for the vehicle, subwoofer system, and listening preferences. It is suited to listeners who want more control over bass character without replacing the rest of their audio system.

A SWEEP control selects the bass center frequency from 27Hz to 63Hz, allowing adjustment toward deeper sub-bass or higher-impact bass frequencies. A separate WIDE control changes the range of frequencies affected by the processing. Together, these controls allow more targeted tuning than a single fixed-frequency bass control.

The AD7500B is specified with a 10Hz to 35kHz frequency response, a 133dB signal-to-noise ratio, and 0.0025% total harmonic distortion. Its balanced RCA inputs are rated to accept up to 15V RMS and provide more than 62dB of noise rejection. These specifications support integration with higher-output aftermarket source and signal-processing equipment while helping reduce unwanted electrical noise.

A dash-mount remote is included for convenient adjustment from the driver's seat, with an LED indicator for status visibility. The processor also includes a PFM subsonic filter switch to reduce very low-frequency content below the useful range of a subwoofer system. Powered by 12V DC and rated for a 150mA current draw, it is intended for permanent vehicle-audio installation.

Key Features

• Digital Bass Processing: Restores and shapes low-frequency content in the signal path.
• 27Hz–63Hz Sweep: Select the bass center frequency for system-specific tuning.
• Wide Control: Adjust the frequency range affected by processing.
• Balanced RCA Inputs: Supports up to 15V RMS input signals.
• Dash-Mount Remote: Adjust bass output conveniently from the driver's seat.
• PFM Filter Switch: Reduces unnecessary ultra-low-frequency signal content.

Design & Installation

The AD7500B uses a dedicated bass-processing layout with two rotary tuning controls, balanced RCA inputs, RCA outputs, and a separate dash-mount remote control. Its published specifications do not identify the enclosure material or exact chassis dimensions. The control arrangement is focused on direct adjustment of bass frequency, processing width, and output level.

Install the AD7500B in the RCA signal chain before downstream crossovers, equalizers, or amplifiers. Connect a compatible line-level source to its balanced RCA inputs, route the RCA outputs to the next audio component, and supply 12V DC power. Use the remote in an accessible dash location, then set the SWEEP, WIDE, remote level, and PFM filter according to the subwoofer system's usable low-frequency range.