Behringer FBQ1502HD Ultragraph Pro Equalizer

Behringer FBQ1502HD Ultragraph Pro — 15-Band Stereo Graphic EQ with FBQ Feedback Detection

The Behringer FBQ1502HD Ultragraph Pro is a 15-band stereo graphic equalizer made for live, studio, and installation scenarios. It is built around 4580 dual op-amps and a Planet Earth switching power supply, with the addition of a dedicated mono XLR subwoofer output for bi-amped setups.

FBQ Feedback Detection and Subwoofer Crossover in One Unit

Instead of a basic EQ, this model features an integrated FBQ Feedback Detection System that instantly lights up the fader corresponding to any problematic frequency. Its dedicated subwoofer output with adjustable 30 Hz–200 Hz low-pass crossover also enables use as a 2-way crossover.

15 Bands per Channel with Switchable Boost/Cut Range

Frequency shaping is provided by two sets of 15 bands with fixed Q. Adjust the boost/cut range between ±6 dB for subtle tweaks or ±12 dB for more dramatic changes; a switchable highpass filter removes unwanted rumble.

• Number of Bands: 2 × 15 — full spectrum coverage for dual independent channels
• Boost/Cut Range: ±6 dB or ±12 dB (switchable) — adapts to both precise room tuning and aggressive sound sculpting
• Activate the highpass filter to eliminate low-end rumble and free up amplifier headroom.

Servo-Balanced I/O with Dedicated Subwoofer Output

XLR and 1/4" TRS connectivity integrates easily into most signal chains. Servo-balanced design helps reject ground-loop hum.

• Analog Inputs: 2 × XLR, 2 × 1/4" TRS — accepts balanced line-level signals from mixers and playback gear
• Analog Outputs: 2 × XLR, 2 × 1/4" TRS, 1 × XLR sub out — routes main PA plus a dedicated mono subwoofer
• Set the subwoofer crossover anywhere from 30 Hz to 200 Hz low-pass.

1U Rack Format with Hard-Bypass and Internal Power Supply

The 19" / 1U enclosure is sized for compact racks and small installations. With relay-controlled hard-bypass, signal passes directly through, and auto-bypass maintains audio during power outages.

• Rack Format: 19" / 1U — suitable for compact touring racks and installation cabinets
• Power Supply: internal Planet Earth switching, IEC AC input — no wall-wart required, ready for worldwide use
• Signal path is protected by relay hard-bypass with automatic bypass in case of power failure.