Precision Power PPI DEQ.8

Digital Sound Processor w/ 31 Band Graphic Equalizer & 9 Band Parametric EQ w/ Time Alignment


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DEQ.8 Features:

  • 31-Band Graphic Equalizer with 172MHz-28/56 bit Digital Signal Processing (DSP)
  • 9-Band Parametric Equalizer
  • 24 bit ADC/DAC with 96kHz sample rate
  • Connect to a PC or Mac computer and modify your configuration in real time using an intuitive software
  • WinXP/Vista/7 & MAC Compatible
  • SD Card slot for easy transfer of configuration data
  • 8-Channel outputs allows for a unique customization
  • Individually adjust each input channel or link channels together
  • Create a simple 2 way setup with subwoofers or a 4 way setup with multiple drivers
  • 4-way crossvoer
  • Left and right gain adjustments
  • Time alignment controls
  • Create up to 4 preset memory settings
  • Selectable balanced or unbalanced inputs
  • High level inputs for factory integration
  • SPIDF Input
  • Fine tune your factory system without losing any factory features
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

DEQ.8 Specifications:

  • Number of Bands: 40 (31 Graphic, 9 Parametric)
  • Maximum Input Signal at 0dBFS:
    • RCA Connector: 2Vrms (+8 dBu) or 0.9Vrms
    • High Level Inputs: 4Vrms (+14dBu) unbalanced signal
    • High Level Inputs: 8Vrms balanced signal (20 dBu)
  • Maximum Output Level at 0dBFS: 8Vrms with a balanced signal (20dBu)
  • Signal-to-noise ratio: 114dB

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.
31 band
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.

Low-Pass (LP)
High-Pass (HP)
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.
8 volts

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Loveland, Ohio

Great bang for the buck.

September 14, 2014

I could not be happier with this processor. Finally have a good interface with the Uconnect in my 2011 Charger. Using the high level inputs the signal is crystal clear. No added noise. The unit has 32 band EQ on each input and parametric EQ on all output channels. Each output also has crossover settings.The routing makes it very easy to match inputs to outputs. You can also create 4 different configurations and switch between them for what ever you need. The software is very easy to figure out and can be downloaded from PPI to look at before you buy. I am using this in my system that I am competing with in SQL in MECA.
Only con for some might be the need to use a computer to configure the system. A computer also is needed to switch between your configurations. But for all the control this unit offers for the money this can be easily overlooked. I am planning to get a 8" windows tablet to do this and stream music from in the car.

7 of 9 found this helpful

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Great DSP for the price

May 11, 2014

The PPI DEQ.8 is a great processor for the price you pay. Its basically a plug and play mini DSP, and shares the same software (which is a good thing since the miniDSP is a well respected product.)

I do wish they made a display or controller for it, for on the fly adjustments, or even an Android app. But those things have been brought up with PPI already.

I would recommend this unit to anyone who wants FULL control of their system, and or wants to integrate it into a factory head unit.

8 of 11 found this helpful

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Accessory Tools and Products

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

25 ft. of True Spec 16 Gauge EnvyFlex Speaker Cable/Wire (100% Oxygen-Free Copper)

Your Price $17.99

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Why did you choose this?
Sonic Electronix Store
I have had this in my car for almost a month. It is working perfectly. no added noise and has everything you could possibly need in a processor. Very good quality. I recommend it if you are wanting to get serious about your audio setup.
Joseph D on Sep 12, 2014

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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: Precision Power PPI DEQ.8

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Precision Power PPI DEQ.8

Digital Sound Processor w/ 31 Band Graphic Equalizer & 9 Band Parametric EQ w/ Time Alignment


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