3 Band Parametric Equalizer-Terminals/Phono Jacks

The RDL FP-PEQ3 is a highly versatile three-band parametric equalizer designed for precise, independent control of frequency, boost or cut, and bandwidth. Its adjustable coverage spans 15 Hz to 20 kHz, while each filter provides a bandwidth range from 0.04 to 1.5 octaves and an amplitude range of ±15 dB. Balanced terminal-block and unbalanced phono connections accommodate +4 dBu and −10 dBV audio paths, and output-level metering provides a visible reference during setup and adjustment.

Ideal Use Cases

The FP-PEQ3 is suited to audio systems that require targeted correction across low-, mid-, and high-frequency regions. Its three switch-selectable frequency ranges cover 15 Hz to 200 Hz, 150 Hz to 2 kHz, and 1.5 kHz to 20 kHz. This broad range makes the equalizer useful for acoustic adjustment, correcting specific frequency problems, or refining overall system response. It is also a practical choice when an installation includes either balanced terminal-block wiring or unbalanced phono connections.

Why Choose This Model

Each of the three filters is independently adjustable, giving the operator direct control over frequency, boost or cut amplitude, and bandwidth. The narrowest 0.04-octave setting supports highly focused adjustments, while settings up to 1.5 octaves permit broader tonal changes. Boost or cut is adjustable across ±15 dB and is switch-selectable for easier acoustic adjustment. Adjustable gain from off to +3 dB provides additional output-level control, while the built-in output-level meter helps monitor the resulting signal.

Installation and Integration

The input section provides a +4 dBu balanced connection on a detachable terminal block and a −10 dBV unbalanced phono jack. Corresponding outputs include +4 dBu balanced audio on a plug-in terminal block and −10 dBV unbalanced audio through a phono jack. Input impedance is 10 kΩ for both the balanced bridging and unbalanced inputs. The unit requires ground-referenced 24 Vdc at 120 mA. Recommended power supplies are the PS-24AS for the USA and PS-24AX for international use; the power supply is not included.

Listed dimensions are 1.42 by 3.25 by 5.66 inches, equivalent to 3.61 by 8.26 by 14.38 centimeters. The specified ambient operating range is 0°C to 50°C. The FP-PEQ3 uses the RDL FLAT-PAK format and combines terminal-block wiring with phono-jack access in one unit.

Performance Highlights

With the filters set flat, frequency response is specified from 10 Hz to 20 kHz within ±0.25 dB. THD+N is less than 0.005%, and noise is specified below −90 dB relative to +4 dB. For the balanced input, common-mode rejection is rated at 50 dB at 100 Hz. These measurements complement the independently adjustable filters and support the stated studio-quality, low-noise performance. The overlapping frequency bands allow adjustments to be placed throughout the equalizer’s 15 Hz to 20 kHz operating range.

What Makes It Different

The FP-PEQ3 combines three independently adjustable filters with unusually broad control over each filter’s bandwidth and amplitude. Rather than limiting adjustment to a single parameter, it provides control of frequency, boost or cut, and bandwidth. Its switch-selectable frequency ranges, ±15 dB adjustment, and 0.04- to 1.5-octave bandwidth allow either tightly focused or broader correction. Balanced and unbalanced connection options, output-level metering, and the RDL FLAT-PAK form factor bring those controls together in a compact installation format.

Final Assessment

For systems requiring detailed three-band equalization, the FP-PEQ3 offers documented control from 15 Hz to 20 kHz, independent filter adjustment, and both balanced and unbalanced connectivity. Its low THD+N, specified low-noise performance, flat-filter frequency response, and output metering make it a strong fit for careful audio-system adjustment. Installation planning should include a compatible 24 Vdc power supply because one is not supplied with the unit.