3-Band Parametric Equalizer


Radio Design Labs' FP-PEQ3 is part of the group of versatile FLAT-PAK products from Radio Design Labs. The unique FLAT-PAK case can be directly screwed or bolted to cabinets or shelves. Optionally available rack-mounting accessories permit single or multiple FLAT-PAK module mounting. All FLAT-PAK modules are supplied with a power interconnect cable for daisy-chaining multiple modules from a single power supply.

The FP-PEQ3 is the ideal choice in many applications where parametric equalization or acoustic notch filtering is needed. Power connections are made using either the full-size barrier block terminals or a dc power jack located in one end panel. A second dc power jack is provided on the other end panel for connecting additional FLAT-PAK modules.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

The FP-PEQ3 is a single channel module featuring three identical independent filters. Each filter has separately adjustable FREQUENCY, BOOST/CUT amplitude, and bandwidth (BW) parameters. The FREQUENCY has three fully overlapping switch-selectable ranges: 15 Hz – 200 Hz, 150 Hz – 2 kHz, 1.5 kHz – 20 kHz. The BOOST/CUT provides a 15 dB range, switch-selectable to produce either cut or boost. Setting a given filter’s BOOST/CUT to minimum completely removes that filter from the circuit. The bandwidth (BW) allows adjustment from 0.04 octave to 1.5 octave.

Acoustic feedback filtering alignment using the FP-PEQ3 is simpler and quicker than with other parametric equalizers. System levels may be selectively increased by setting a filter to the BOOST mode, tuning the FREQUENCY and adjusting the BOOST/CUT potentiometer for feedback. That filter is then simply switched to the CUT mode. The bandwidth (BW) control may be adjusted for broad effect, or for a sharp 1/25th octave notch at a single frequency.

Balanced and unbalanced inputs and outputs are provided. Unbalanced connections are intended for –10 dBV signals on phono jacks. Unbalanced –10 dBV signals are internally converted to +4 dBu and back. Balanced +4 dBu input and output signals connect through a plug-in terminal block. The input gain control allows the installer to set the module gain between off and 3 dB greater than the input signal. The module is normally adjusted for unity gain, however if the BOOST mode is used, it is possible to generate excessive signal levels. Overload is avoided by setting the gain using the dual LED meter provided on the FP-PEQ3. The dual LED output meter follows standard VU ballistics. A green LED illuminates at 15 dB below +4 dBu output. The intensity of the green LED progresses from minimum at -11 dBu to full intensity at +4 dBu. The adjacent red LED illuminates at +4 dBu. The audio may be adjusted for maximum intensity of the green LED. Flashing of the red LED is equivalent to a VU meter needle swinging above the 0 level.

The FP-PEQ3’s low profile and compact size permit mounting in confined spaces and in various locations in equipment racks. The location of the input/output jacks permits high-density mounting against flat surfaces while maintaining accessibility to the connectors. The low noise, studio quality performance of the FP-PEQ3 makes it the ideal choice in most sound systems. The economical cost makes notch filtering possible in small systems where expensive products are precluded. Many versatile systems may be designed using FP-PEQ3s mounted near amplifiers, to rack sides or in an equipment rack (either the front or rear rack rails) using the RDL FP-RRA.

  • Inputs (2):
    • +4 dBu balanced on plug-in terminal block
    • –10 dBV unbalanced phono jack
  • Input Impedance: 10 kW (balanced bridging); 10 kW (unbalanced)
  • Gain Range: Off to +3 dB (adjustable)
  • Outputs (2):
    • +4 dBu balanced on plug-in terminal block
    • –10 dBV unbalanced phono jack
  • Filters (3): Independently adjustable
    • Frequency Range: 15 Hz – 200 Hz, 150 Hz – 2 kHz, 1.5 kHz – 20 kHz (adjustable) (switch selectable ranges)
  • Boost/Cut Amplitude: ±15 dB adjustable
  • Bandwidth: 0.04 octave to 1.5 octave (adjustable)
  • Freq. Response (filters flat): 10 Hz – 20 kHz (± 0.25 dB)
  • THD + Noise: < 0.005%
  • Noise: < -90 dB (below +4 dBu)
  • CMRR (balanced input): 50 dB @ 100 Hz
  • Power Requirement: Ground-Referenced 24 Vdc @ 120 mA
  • Dimensions: 1.42" H x 3.25" W x 5.66" L (3.61 x 8.26 x 14.38 cm)

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