Audio Control Epicenter Plus Bass Restoration Processor With Auxiliary Input (EPICENTERPLUS)

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You like all the bumpin' bass you hear in hip hop, rap, and EDM? Well you can put that deep, pulsing bass into any kind of music — from classical, jazz, and rock to folk and Tejano — with an AudioControl Epicenter Plus bass restoration processor. Most factory radios dial down bass response to protect flimsy speakers, so when you do add a subwoofer, there's no bass to play. The Epicenter Plus will bring it back.

AudioControl's legendary Epicenter Plus bass processor maximizes the low-frequency power and punch of your bass system, whether it's a simple powered bass tube or a full-blown competition setup. Simply install this processor between your receiver and your amplifiers or crossovers, and you'll finally be able to hear all the good bass you've been missing. Speaker-level inputs allow you to add an Epicenter to even a factory system. An included wired remote lets you control the amount of thump from the front seat.

How does it do it?

Sophisticated processing analyzes the incoming signal and synthesizes low-bass fundamental tones, increasing bass response tremendously. The Epicenter Plus connects to almost any receiver — the balanced inputs will reject noise from your car's electrical system. A subsonic filter removes extreme low frequencies from your signal so your amps and subs will play more efficiently, while a single band ParaBass equalizer lets you fine-tune the bass tone.

Adds an auxiliary input for your system

The Epicenter Plus provides an auxiliary input, so you'll be able to play your tunes through your car audio system from almost any phone or portable music player. Clicking the remote knob switches between the main receiver and auxiliary sources.

Product highlights:

  • -bass restoration processor with aux input
  • -increases bass response from your system
  • -2-channel preamp inputs and outputs
  • -speaker-level inputs accept signal up to 400 watts
  • -auxiliary RCA line input adds an audio source
  • -fixed subsonic filter (33 Hz, 12/dB octave)
  • -wired remote for bass level and source selection
  • -frequency response: 10-22,000 Hz
  • -fuse rating: 2A
  • -8-1/16"W x 1-1/4"H x 7-9/16"D
  • -warranty: 5 years


Bass Restoration: Rather than simply turning up the bass, the patented bass restoration circuit takes a full range input signal and measures the upper harmonics of the bass frequency range to determine what frequencies have been lost during the recording process, then correctly restores the missing bass information. The remote rotary knob allows you control how much bass is restored to the system. A full range signal is output from the Epicenter Plus that can feed a full range amp, a subwoofer amp (with built-in crossover), or an outboard crossover.

Speaker Input: The speaker level input is compatible with nearly any factory stereo system.

Auto Turn-on: The speaker level input also has a signal sensing circuit; the unit turns on when there's a speaker level input signal and turns off when the signal disappears.

Remote Output: The +12 volt DC remote output will trigger an amp to turn on whenever the Epicenter Plus is on. The remote's maximum current output is 1 amp.

Auxiliary Input: There is a pair of RCA auxiliary input jacks on the unit so you can easily add an iPod, satellite radio, or other secondary source. The aux input is engaged by pressing the knob on the wired remote. Note: The auxiliary source must have its own volume control; the Epicenter Plus has no way of controlling the volume.

Bass Maximization: The Bass Maximization circuit allows The Epicenter Plus to maximize the bass output of any system while restraining destructive bursts, which can damage speakers. the 5.0 volt factory setting can be changed to 7.5 volts if the amplifier and speakers can handle it.

Remote: The bass restoration level is adjusted using the included wired remote. The remote is designed to be dash mounted, within reach of the driver; it can be mounted under the dash with the supplied bracket, or the bracket can be removed and the knob and LED can be custom mounted through the dash. Dimensions:

  • Width: 2.557"
  • Height: 1.489"
  • Depth: 1.824" (2.448" including knob)

Subsonic Filter: The subsonic filter crossover point is 33 Hz; it's governed by a replaceable chip, so it can be changed to 20, 25, 30, 35, 40, or 45 Hz.

Balanced Inputs: Using the balanced differential input circuit cancels noise picked up in the transmission line between the Epicenter Plus and the the source unit. The inputs can be set to balanced or unbalanced if needed.

Ground Isolation: The power supply ground is switchable, in case of ground loop noise. The factory position is fully isolated (typically the best choice), but can be changed to Ground or 200Ω.

Terminal Blocks: The power/ground/remote in/remote out terminal and the speaker level input terminal are removable; the wiring is attached to the block, then the block is plugged into the Epicenter Plus.


  • Frequency response: 10Hz-22kHz;±1dB
  • THD: 0.003%
  • S/N Ratio: 130dB
  • Balanced Input Noise Rejection: >60 dB
  • Input Impedance: 20 kΩ
  • Output Impedance: 150 ohms

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