Used Peavey Q431FX Pro Sound Effect

Used Peavey Q431FM 31-Band Graphic Monitor Equalizer with FLS

Estimated Year: 2000s 

Made in: USA

The Peavey Q431FM is a pro-level 31-band graphic equalizer built specifically for monitor and PA system control, featuring Peavey’s FLS (Feedback Locating System) to quickly identify and eliminate problem frequencies. This is the monitor-focused version of the Q431F, making it especially useful for live sound applications where feedback control is critical.

With 31 bands spanning 20Hz–20kHz, this unit gives you precise control over your mix using constant-Q filters, meaning adjustments stay tight and musical without affecting neighboring frequencies. The FLS system lights up problem frequencies, allowing you to dial them out fast—huge for stage wedges, vocal mics, or loud environments.

It also includes a 40Hz low-cut filter to remove rumble, a bypass switch for quick A/B comparison, and LED output metering for monitoring levels. Built like a tank and made in the USA, this is a workhorse EQ for live rigs, installs, or rehearsal spaces.

Condition 

Good condition with cosmetic wear from rack use. 

- Rack rash and scratches on faceplate and top 

- All sliders intact and moving properly 

- LEDs, switches, and FLS system functioning 

- Fully tested and working 

Store Policies 

- All items are tested before listing and again before shipping. 

- Orders typically ship next business day. 

- Shipping is available to the continental U.S. only. 

- We do not accept trades on shipped items. 

- Returns are accepted within 48 hours of delivery. The buyer covers return shipping, and a 20% restocking fee applies. If you have any questions before buying, feel free to message us—we’re happy to help.