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Audyssey MultEQ Pro Sound Equalizer Review

by Patrick Hart October 10, 2006
Audyssey Sound Equalizer with MultEQ Pro

Audyssey Sound Equalizer with MultEQ Pro

  • Product Name: MultEQ Pro Sound Equalizer
  • Manufacturer: Audyssey Laboratories
  • Performance Rating: StarStarStarStarStar
  • Value Rating: StarStarStarStarStar
  • Review Date: October 10, 2006 19:00
  • MSRP: $ 2500

Analogue input: 8 channels, unbalanced
Analogue input reference level: Industry standard for controller outputs – 150mVrms

Room correction: MultEQ XT filter for each channel applied at sub/sat splice

SNR: 108dBA

Connections: RS-232 port, USB 2.0, 4 pairs analogue RCA (unbalanced) outputs, 4 pairs analogue RCA (unbalanced) inputs, test port (Audyssey use only)


  • Unprecedented calibration ability
  • Delivers 8x more bass accuracy than MultEQ XT receiver-based version
  • 2 X accuracy over MultEQ XT above low-bass region
  • Unit appears transparent within system
  • High value for installers & integrators
  • Highest quality DACs and ADCs utilized


  • Requires professional setup and calibration for best results
  • Requires optimal speaker placement for best results
  • Lower cost speakers may not exhibit desired performance envelope
  • Typically requires separates or amplifier
  • 8 pairs of RCA interconnects required for full utilization
  • No +12V Trigger


Audyssey MultEQ Pro Sound Equalizer Introduction

Ultimate audio performance within the listening area starts with the loudspeakers and the room. How the Installer gets the loudspeaker system to integrate within the listening space is what can make or break even the best assembled audio systems.  In our article Better Sound Through Active Room Correction (recommended reading before reading this review) the important metrics of loudspeaker placement and selection, room acoustics, and how to best integrate all of these variables using the new Audyssey Pro MultEQ enabled processor for the ultimate theatrical experience in the comforts of your home was discussed.  We now expand upon this with a formal review of the Audyssey MultEQ Pro sound equalization processor. 

Audyssey comes to the table with a proprietary phase and frequency measurement technology. Co-founder and Chief Scientist, Tom Holman, in my December 2004 interview with he and cofounder and CTO Chris Kyriakakis states "While real-time analysis is 'time-blind' (so you have to know something about the time domain before you use it) nevertheless, if you clean it up, it has some advantages over the FFT-based analyzers. The THX R2 (from the eighties) was readily able to do spatial averaging and temporal averaging and we realized if we made an extension of it using a laptop with an add-on spectrum analyzer peripheral that we could send signals across dynamically from the analyzer and do a lot of mathematics to it and therefore clean up the signal." 

To gather the precise phase and frequency data requires another capability; extremely accurate (claimed to within 0.25" !) speaker-to-microphone distance information. When an installer begins to go through the Audyssey Sound Equalizer measurement routine the first packet of data he feeds into the MultEQ Pro's memory is the speaker task-name such a left-front, center, etc. (The installer will have already defined the size of the room [length, width and height] on a previous screen within MultEQ Pro). While it is taking distance information MultEQ Pro will also take the first 200 milliseconds of phase and frequency data and place the information into the i.e. "left-front" folder. Repeat the operation with the microphone stationary at this first "sweet spot" eight times (for the Sound Equalizer's 8 channels) for all satellites and subs in the room. MultEQ Pro will now have a very precise map of how the speakers are arranged in the room.

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