MR3eq is a 500 series equaliser module built on the Harrison MR3 EQ circuit, one of the sections engineers name specifically when they talk about why those consoles sounded the way they did.

The EQ people actually name when they talk about Harrison desks.

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3-Band Parametric EQ with HP Filters Originally developed for the Harrison MR3 studio console, the MR3eq stands out as one of Harrison’s most popular EQ designs, renowned for its punchy, smooth sound, and powerful sculpting capabilities. Introduced in 1981, the Music Recording 3 (MR3) console rapidly became the preferred tool for numerous leading engineers and studios worldwide, helping to create some of the most iconic albums from the 70s and 80s. Like all Harrison production tools, the MR3 EQ delivers the vibe to inspire artists and the precision for engineers to excel. Thanks to the MR3eq module, the distinctive Harrison sound is now accessible in the 500 Series format. The MR3eq is a high-performance analog EQ, crafted from decades of experience in equalizer and filter design. The circuit design of this EQ allows for precision in surgical tasks or the creation of broad musical strokes with lots of band interaction for a rich and colorful sonic character. 3-Band Parametric EQ with HPF The MR3eq is a powerful three-band parametric equalizer that features High-frequency 6 dB/octave Shelf bands, which can be switched to a 2nd order Bell response with Harrison’s renowned proportional Q. The Mid-band offers a continuously variable Q, while a separate High Pass Filter section includes a 3dB corner frequency. The MR3eq’s flexible design and powerful sculpting capabilities make it a versatile tool that enhances a wide array of source materials, proving equally effective in both tracking and mixdown scenarios. Features: The Harrison sound. Perfect for both precision EQ’ing and broad musical strokes. Three-band parametric EQ with +/- 10 dB boost/cut range. High-frequency (800 Hz – 15 kHz) 6 dB/octave Shelf band, switchable to 2nd order bell. Mid-band (400 Hz – 8 kHz) with continuously variable, proportional Q. Separate High Pass Filter with 3dB corner frequency. Separate In switches for EQ and HPF sections. Input overload LED. Compatible with 500 Series format chassis.

At a Glance

What Is the MR3 EQ?

The equaliser section from the Harrison console line, with the particular curve shapes and interaction between bands that gave those desks their character. This module puts it in 500 series format.

Does It Fit Any 500 Series Rack?

Yes, it is a standard 500 series module.

How Do I Build a Full Harrison Channel?

The 32Cpre+ preamp module, this MR3eq equaliser and the Comp Dynamics module together give preamp, EQ and compression across three 500 series slots.

Why Harrison Audio

Harrison built the consoles that mixed a large share of the records and films you know, starting in Nashville in 1975 with the 32 Series. The MR3 EQ and the 32C channel strip are the circuits that gave those desks their sound. Harrison is now part of the Solid State Logic group, and the current products put those original designs into 500 series modules, rackmount interfaces and networked systems.