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Furman PQ-4 Parametric Equalizer

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Page last updated Aug 11, 2025

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Description

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The Furman PQ-4 Parametric Equalizer is a versatile tool for musicians and audio engineers seeking precision in their sound shaping. Trusted in studios for its impeccable performance, this parametric equalizer offers unmatched control over your audio frequencies. With its ability to fine-tune and sculpt sound, the PQ-4 provides four fully adjustable frequency bands, allowing for detailed and precise equalization.

This equalizer is designed to handle diverse audio tasks, from correcting problematic frequencies to enhancing the tonal quality of your recordings. Whether you're working in a live setting or a studio environment, the Furman PQ-4 delivers consistent results with its low-noise circuitry, ensuring your audio remains clean and transparent.

Its user-friendly interface makes it accessible to both novices and seasoned professionals alike. The PQ-4 is equipped with high and low shelving filters, as well as a range of 20 Hz to 20 kHz, covering the entire audio spectrum. This flexibility makes it an ideal choice for any musician looking to perfect their sound.

Key Features:

Four fully adjustable parametric frequency bands
High and low shelving filters
Frequency range from 20 Hz to 20 kHz
Low-noise circuitry for clean audio output
User-friendly interface for ease of use in any setting

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Ola Englund

DIMEBAGS CFH GEAR TONE TEST - PQ4, MXR 6-band, RG100HT

Ola Englund

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Furman PQ-4 Parametric Equalizer.

Features and functionality

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The Furman PQ-4 allows precise control over frequency selection, boosting or cutting, and the width around the frequency, making it versatile for tone shaping.
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The PQ-4 is favored for its ability to fine-tune specific frequencies, offering greater tonal customization than fixed-frequency graphic EQs.
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Use cases and applications

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Users often run the Furman PQ-4 in the effects loop to achieve distinct upper mid-range enhancements, crucial for emulating Dimebag's tone.
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Placing the parametric EQ before the amp can effectively boost mids while tapering lows and highs, mimicking Dimebag's setup.
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The PQ-4 is highly effective in the effects loop, particularly at the end of the chain, enhancing tone clarity and tightness.
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User experience

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Achieving Dimebag's tone solely with EQs might not be satisfying, as his sound involved extensive post-processing and compression beyond EQ adjustments.
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Users consistently find the Furman PQ-4 superior to graphic EQs, particularly for its precise control and ability to shape tone effectively.
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Comparisons

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Rack EQs in the effects loop are preferred over pedals, providing superior sound due to post-preamp application and better value, especially on the used market.
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Dimebag Darrell

Guitarist

Pantera

Verified via Photo

Visible in this photo of Darrell's rack gear. It is also mentioned in this 1992 interview at 21:27 and this June 1996 Guitar World interview.

Interview with Pete Brown, 1992

[Brown] What kind of Randalls are they?

[Darrell] They're Randall RG100HTs. They're rack mount. I think HT means "rack mount", I don't know.

[Brown] You got a pedal board?

[Darrell] I don't I have them in a rack and the only thing else I use is a Furman PQ-4 parametric equalizer. I just use that, I don't really use it for much more than just cuttin' out some frequencies that I don't want and boostin' a couple that I do want. And the main thing is another vital, detrimental thing to my tone, is a little blue MXR Six Band EQ, nine volt battery and that's it. I use a-

[Brown] A whammy pedal?

[Darrell] I don't even include that, because I come out and I fuckin' just use that thing to get super ridiculous squeals. I just got it, I don't even know how to use it good yet.

Guitar World, June 1996, posted online on January 22, 2013 as "From the Archive: Dimebag Darrell Discusses Pantera's 1996 Album, 'The Great Southern Trendkill'"

You've got a killer, brittle rhythm tone on this album. Have you changed your basic setup at all since the last record?

Kinda. I ended up using the old, carpeted Randall RG-100 head I recorded Cowboys From Hell with.

What happened to the Randall Century 200's you've been playing through for the longest time?

When we were jamming around and doing the demos I didn't bother to hook up my normal rig; I just wanted something that would do the job. So, we dragged in a bunch of my old shit and set it up. In addition to my RG-100 stack, I used an old Furman PQ-3 parametric EQ, which has a different gain structure from the PQ-4's I've got in my main rack, my blue MXR 6-band graphic EQ and a cheap little Boss Noise Gate. Then, when we did the demos, I was liking the way everything was sounding so I thought, "Don't fuck with it, there it is!"