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AudioControl EQS - Black (Open Box)

6 Channel Trunk Mount 13-Band Graphic Equalizer with 5-year warranty*!

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AudioControl EQS - Black (Open Box)

6 Channel Trunk Mount 13-Band Graphic Equalizer with 5-year warranty*!


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For over two decades, AudioControl has been designing and manufacturing award-winning autosound products at our factory located in the rainforests of the Pacific Northwest. During this period, countless sound-off winning contestants have chosen AudioControl products to give them the competitive edge. "Can you really win without AudioControl", was part of an article written commenting on competition winning systems. Nothing sounds better than an awesome recording played back on a kickbutt system. Unfortunately, the acoustics of your vehicle can take away from your systems performance. While AudioControl products do not change the laws of physics (although they act like they do), autosound enthusiasts have long known that AudioControl products "make good stereo sound better"

EQS - 6 Channel Trunk Mount Equalizer

Great sound for six channels, all in one unit. Separate inputs and equalization for front, rear, and subwoofer speakers. The EQS has seven bands of full and half octave equalization control for the front and rear plus six, one-third octave equalization bands for maximum bass control. Add to that the Programmable Frequency Match (PFM) filter and a low output impedance line driver and you get maximum output and sonic clarity everywhere in the car. And to easily use a factory head unit, the EQS has built-in speaker level inputs. Truly a product for those who consider perfection possible.

Key Features:

Dual Bandwidth Equalization:

The EQS has 40 bands of AudioControl's award winning dual bandwidth equalization for total sound control. With the EQS, you have six, one-third octave equalization controls for the subwoofer plus seven, full and half octave equalization controls for both the front and rear channels.

Separate Front, Rear, and Subwoofer Inputs:

The EQS has six channels of input and six channels of output to provide a simple interface with today's multi-channel systems. By combining the sonic performance of AudioControl processing with the bells and whistles of a multi-channel head unit, you get maximum performance - using only one component. In addition, a unique switching system actually senses if connections are present at the subwoofer inputs of the EQS. If only four channels are being used, the EQS switches the subwoofer equalization automatically to the rear channels.

Maximize Your Bass Performance:

Optimum output of your performance sound system requires every component and speaker operating in an ideal environment. The AudioControl PFM (programmable frequency match) circuit gets the maximum output from your low frequency speakers and protects them from non-musical subsonic information. This programmable subsonic filter provides an 18 dB/octave high pass filter for your subwoofer or other low frequency speakers. The PFM is the ultimate tool for tuning subwoofer enclosures.

High Voltage, Low Impedance Line Driver:

Like other AudioControl products, the EQS has a 13-volt, low output impedance pre-amp line driver. This means the EQS can dramatically increase the pre-amp signal level from your source unit and deliver it downstream to the amplifiers. Higher signal voltage means maximum output, sonic clarity, and the ability to drive multiple amplifiers!

Easy Interface with Factory Installed Systems:

The EQS lets you easily add aftermarket amplifiers to factory installed source units via a built-in 4-channel active speaker level input adapter. Different than most speaker level adapters, there is no loss in fidelity when using AudioControl's design. In addition you can even continue to use your fader.

AudioControl EQS Features

  • Item Condition: Like New, Open Box
  • 13-Band Graphic Equalizer
  • Six Inputs and Outputs
  • Dual-bandwidth Equalization
  • Auto-mode Configuration Simplifies Installation
  • Programmable Frequency Match (PFM) Subsonic Filter
  • Speaker Level Inputs - Can Accept 400 Watt Signals!
  • Balanced Line Level Inputs For Superior Noise Rejection
  • Input and Output Level Matching Controls
  • Built-in Line Driver
  • Front / Rear / Sub Fader Compatible
  • 13 Volt Signal Compatible
  • Output Voltage Display
  • Color: Black Blue
  • Also available in White: AudioControl EQS (White)
  • Weight: 3.25 lbs.
  • Dimensions: 8.8" W x 9.3" D x 1.3" H
  • Authorized Dealer
  • 5 Year Manufacturer's Warranty (*when installed by an authorized AudioControl dealer)

EQS Specifications

  • Maximum input/output level: 9.5 Vrms/13.5 Vpeak
  • Input/output channels: selectable: 4 or 6 channels
  • Input gain: ± 18 dB
  • Frequency response: 0Hz-100kHz ± 1dB
  • Equalization center frequencies:
    • 31.5, 40, 50, 63, 80, 100, 120,160, 250, 500, plus 1k, 2k, and 10k Hz
  • Total harmonic distortion: 0.003%
  • PFM subsonic filter slope: 18 dB/octave
  • PFM frequency: programmable 15 to 100 Hz (Factory shipped @ 33 Hz)
  • Signal to Noise ratio: -110dB
  • Balanced input noise rejection: >60dB
  • Input Impedance: 20 K ohms
  • Output Impedance: 150 Ohms
  • Power supply: High headroom PWM
  • Power draw: 500mA
  • Recommended fuse rating: 2 Amp

Check out the AudioControl EQS Owner's Manual

Product History:

AudioControl EQS-BlackBlue thumbnail
(newest, current model)
AudioControl EQS-Gray thumbnail
(previous model, replaced by AudioControl EQS - Black (Open Box))

Equalizer Specifications

Type of Equalizer
This determines the way the equalizer processes the signal from the source unit. A parametric equalizer allows to you adjust the center point of the frequency band you are adjusting as well the bandwidth which can be narrowed or widened. A graphic equalizer has fixed frequency bands and bandwidth and only the frequency bands can be adjusted. A digital equalizer uses a software program to tune your system.
A graphic equalizer typically has more adjustable bands and is less expensive, whereas a parametric will have fewer bands but offer a greater level of control and provide more tuning options. Digital equalizers will tune your system with the most detail and precision but require a computer and are typically a little higher in price.
Equalizer Bands
The number of graphic or parametric equalizer bands the receiver has. The better the EQ, the more likely you will be able to "tweak" your sounds to your desire.
13 band
Equalizer Frequencies
The frequency range that allows control of the center frequency of each equalization band.
31.5 - 10,000 Hz
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Built-in Bass Reconstruction
Bass reconstructors, or bass enhancers, improve low frequency reproduction in a car audio system with at least one subwoofer. These bass expander products will help your subs produce accurate bass thumps.
Line Driver
A line driver is a small amplifier used to support the strength of the audio signal coming from the source unit.
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Total Number of Inputs
This is the total number of input connections that go into the unit.
Total Number of Outputs
This is the total number of output connections that the unit will produce.
Max Output Level
The maximum level (in volts) of signal output. A higher level will increase the clarity and boost your signal.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
0 - 100,000 Hz
THD (Total Harmonic Distortion)
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
-110 dB
The width of the item from left to right (side-to-side) measured in inches.
The height of the item, measured from top to bottom, in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.

Warranty and Return Policy

Parts Warranty Duration
5 years
Labor Warranty Duration
5 years
Warranty Provider

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NVX XWS1625 25 ft. of 16 Gauge Speaker Cable/Wire

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: AudioControl EQS - Black (Open Box)