FP-PEQ3 Data Sheet
FLAT-PAK SERIES
™
Model FP-PEQ3
3-Band Parametric Equalizer
ANYWHERE YOU NEED...
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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: 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.
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.
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.
RDL • P.O. Box 1286 • Carpinteria, CA., USA 93014 • (805) 684-5415 • FAX (805) 684-9316 • http://www.rdlnet.com
FLAT-PAK SERIES
Installation/Operation
Model FP-PEQ3
3-Band Parametric Equalizer
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
INPUT LEVEL
ADJUSTMENT
BAL
LEVEL
+4
FILTER 1
BOOST
BAL
LEVEL
+4
FILTER 2
BOOST
FILTER 3
BOOST
15 dB 0 CUT 15 dB 0 CUT 15 dB 0 CUT
INPUT
+
BW
BW
04 1 5
04 1 5
X
X
10
10
10
1
1
1
.1
.1
.1
150 2K HZ 150 2K HZ 150 2K HZ
FREQUENCY FREQUENCY FREQUENCY
04
OUTPUT
15
BW
X
PWR BUS
2A MAX
24 VDC
24 VDC
POWER
SOURCE
BUS
POWER INPUT
2A MAX
1A MAX
OR
GAIN
FP-PEQ3
24 VDC
120 mA
GAIN
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
POT SETS AMOUNT OF BOOST
9
BOOST
4
OR CUT
12
1.5
FULLY CW = NO BOOST/CUT
15 dB 0
CUT
FULLY CCW = 15DB BOOST/CUT
BALANCED
Signal From/To Line
Level Sources
0.15
INPUT
POT SETS BANDWIDTH OF FILTER
AT SELECTED FREQUENCY
+
04
450
POT SETS CENTER FREQUENCY
OF FILTER
OUTPUT
OR
0.3
0.6
1.3
BW
15
700
1.2K
1.5K
SWITCH SELECTS
BOOST OR CUT FOR
THE AMPLITUDE
SETTING ON THE POT
BANDWIDTH
ADJUSTABLE FROM
.04 OCTAVE TO
1.5 OCTAVE
X
10 X10 = 1,500HZ TO 20,000HZ
1
.1 X1 = 150HZ TO 2,000HZ
150 2K
X.1 = 15HZ TO 200HZ
HZ
FREQUENCY
INPUT OR OUTPUT MAY BE
ADJUSTMENT TO REDUCE ACOUSTIC FEEDBACK IF
A REAL TIME ANALYZER IS UNAVAILABLE
BALANCED OR UNBALANCED
INPUT
+
OR
OUTPUT
UNBALANCED
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.
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)
Input Impedance:
Gain Range:
Outputs (2):
Filters (3):
Frequency Range:
Boost/Cut Amplitude:
Bandwidth:
Frequency Response (filters flat):
THD+N:
Noise:
CMRR (balanced input):
Power Requirement:
Overall Dimensions:
891-2075A
+4 dBu balanced on plug-in terminal block; –10 dBV unbalanced phono jack
10 kΩ (balanced bridging); 10 kΩ (unbalanced)
Off to +3 dB (adjustable)
+4 dBu balanced on plug-in terminal block; –10 dBV unbalanced phono jack
Independently adjustable
15 Hz to 200 Hz, 150 Hz to 2 kHz, 1.5 kHz to 20 kHz (adjustable)
(switch selectable ranges)
±15 dB adjustable
0.04 octave to 1.5 octave (adjustable)
10 Hz to 20 kHz (+/- 0.25 dB)
< 0.005%
< -90 dB (below +4 dBu)
50 dB @ 100 Hz
24 Vdc @ 120 mA, Ground-referenced
Height:
1.42 in.
3.61 cm
Width:
3.25 in.
8.26 cm
Length:
5.66 in.
14.38 cm
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
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