RDL FP-PEQ3 Data Sheet

FLAT-PAK

™

SERIES

Model FP-PEQ3
3-Band Parametric Equalizer

ANYWHERE YOU NEED...

•

Highly Versatile Parametric Equalizer

•

Independent Adjustment Controls

•

Adjustable Bandwidth .04 to 1.5 Octave

•

Adjustable Frequency 15 Hz to 20 kHz

•

Cut or Boost Adjustable +/- 15 dB

•

Overlapping Frequency Bands

•

Output Level Metering

•

Studio Quality, Low Noise Performance

You Need The FP-PEQ3!

The 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.

APPLICATION:

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.

The FP-PEQ3 is a single channel module featuring three identical independent filters. Each filter has separately adjustable

FREQUENCY, BOOST/CUT

switch-selectable ranges: 15 Hz – 200 Hz, 150 Hz – 2 kHz, 1.5 kHz – 20 kHz. The
switch-selectable to produce either cut or boost. Setting a given filter’s
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/CUT

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.

Wherever a parametric equalizer is needed to provide adjustable filtering, low noise and distortion, reliability, compactness
and unsurpassed versatility, the FP-PEQ3 is the ideal choice. Use the FP-PEQ3 individually, or combine it with other RDL
products as part of a complete audio/video system.

The FP-PEQ3 is the ideal choice in many applications where parametric equalization or acoustic notch

potentiometer for feedback. That filter is then simply switched to the

amplitude, and bandwidth (BW) parameters. The

BOOST/CUT

BOOST

mode, tuning the

FREQUENCY

BOOST/CUT

to minimum completely removes that

CUT

mode. The bandwidth (BW) control

has three fully overlapping

provides a 15 dB range,

FREQUENCY

and adjusting the

RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• [phone] •• FAX [phone] •• http://www.rdlnet.com

FLAT-PAK

SERIES

Model FP-PEQ3

™

3-Band Parametric Equalizer

2A MAX

BUS

GAIN

POWER

OR

24 VDC

POWER

SOURCE

24 VDC

1A MAX

INPUT

INPUT

+

OUTPUT

BALANCED

Signal From/To Line

Level Sources

INPUT

OUTPUT

INPUT OR OUTPUT MAY BE

OR

BALANCED OR UNBALANCED

INPUT

OUTPUT

UNBALANCED

INPUT OR OUTPUT MAY BE WIRED TO TERMINAL BLOCK OR JACK
NOTE: FOR ACOUSTIC FEEDBACK CONTROL, ONLY THE SOUND SYSTEM MICROPHONE SIGNALS ARE NORMALLY CONNECTED THROUGH THE FP-PEQ3

TYPICAL PERFORMANCE

Inputs (2) +4 dBu balanced on plug-in terminal block; –10 dBV unbalanced phono jack
Input Impedance: 10 k
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 to 200 Hz, 150 Hz to 2 kHz, 1.5 kHz to 20 kHz (adjustable)
(switch selectable ranges)
Boost/Cut Amplitude: ±15 dB adjustable
Bandwidth: 0.04 octave to 1.5 octave (adjustable)
Frequency Response (filters flat): 10 Hz to 20 kHz (+/- 0.25 dB)
THD+N: < 0.005%
Noise: < -90 dB (below +4 dBu)
CMRR (balanced input): 50 dB @ 100 Hz
Power Requirement: 24 Vdc @ 120 mA, Ground-referenced
Overall Dimensions: Height: 1.42 in. 3.61 cm
Width: 3.25 in. 8.26 cm
Length: 5.66 in. 14.38 cm

BAL

LEVEL

FILTER 1

+4

dB15

04

150
FREQUENCY

+

+

1 5X 04

2K 150

OR

FILTER 2

BOOST BOOST

BW

10

1

.1

HZ

FREQUENCY

FILTER 3

BOOST

120 mA

24 VDC

dB

15CUT015 dB0 CUT

BW

1 5X 04

10

1

.1

2K 150

HZ

FREQUENCY

1) SET ALL SYSTEM MIC INPUTS TO THE MAXIMUM LEVEL BELOW WHICH FEEDBACK OCCURS

2) SET FILTER TO "BOOST" WITH AMPLITUDE POT CENTERED; TUNE THROUGH
FREQUENCIES UNTIL FEEDBACK OCCURS

3) SWITCH THAT FILTER TO "CUT" AND REPEAT STEP 2 FOR THE OTHER FILTERS IF NECESSARY

4) SET SOUND SYSTEM TO THE DESIRED OPERATING LEVEL

5) IF FEEDBACK OCCURS, INCREASE THE CUT (CCW) OF EACH FILTER

6) IF NO FEEDBACK OCCURS, DECREASE THE CUT (CW) OF EACH FILTER JUST BEFORE FEEDBACK

7) INCREASE TEMPERATURE AND HUMIDITY STABILITY OF SYSTEM BY INCREASING FILTER BANDWIDTH
AS NEEDED.

Ω

(balanced bridging); 10 k

FP-PEQ3

CUT0

BW

1 5

X

2A MAX

10

1

.1

2K

HZ

PWR BUS

POT SETS AMOUNT OF BOOST

FULLY CW = NO BOOST/CUT

FULLY CCW = 15DB BOOST/CUT

POT SETS BANDWIDTH OF FILTER

AT SELECTED FREQUENCY

POT SETS CENTER FREQUENCY

ADJUSTMENT TO REDUCE ACOUSTIC FEEDBACK IF

A REAL TIME ANALYZER IS UNAVAILABLE

Ω

(unbalanced)

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time exclusive
of EMC data, if any, supplied with product. Specifications are
subject to change without notice.

Power to Additional

Flat-Pak Modules, Total

Current Not to Exceed 2 A

or Available Supply Current

ADJUST GAIN CONTROL

FOR STEADY GREEN AND INTERMITTENT RED LED
LEVEL SHOWN IS FOR BALANCED OUTPUT TERIMNALS

(UNBALANCED OUT JACK IS -10dBV FOR BALANCED +4)

SETTINGS FOR EACH

FILTER

NOTE: APPROXIMATE BOOST/CUT, BANDWIDTH AND FREQUENCY

INCREMENTS ARE SHOWN FOR EACH CONTROL

6

9

OR CUT

OF FILTER

12

0.15

450

0.3

04

700

150

4

1.5

dB15

0 CUT

0.6

1.3

1 5

1.2K

1.5K

2K

FREQUENCY

INPUT LEVEL

ADJUSTMENT

GAIN

BOOST

BW

X

10

X10 = 1,500HZ TO 20,000HZ

1

X1 = 150HZ TO 2,000HZ

.1

HZ

BAL

LEVEL

+4

SWITCH SELECTS

BOOST OR CUT FOR

THE AMPLITUDE

SETTING ON THE POT

BANDWIDTH

ADJUSTABLE FROM

.04 OCTAVE TO

1.5 OCTAVE

X.1 = 15HZ TO 200HZ

891-2075A

U.S.A. [phone], [phone]; Fax: [phone]

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287

Radio Design Labs Technical Support Centers