AudioControl Epicenter Plus

Bass processor with aux input for factory or aftermarket systems (Gray)

The Epicenter Plus processor from AudioControl will maximize the low-frequency power and punch of any bass system, whether you’ve got a simple powered tube or a full-blown competition setup. You can connect the Epicenter Plus to any stereo, and its speaker-level inputs will even accept the output from a high-power factory amplifier. Simply install this processor between your car’s receiver and your outboard amplifiers, and hear what you’ve been missing.


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