1
551E
552E
/
Introduction
Chapter 1
551E Front and Rear panels
BAND 5
BANDWIDTH
CUT/BOOST
CUT/BOOST
BAND 4
FREQUENCY
BANDWIDTH
CUT/BOOST
FREQUENCY
BANDWIDTH
BAND 3
FREQUENCY
0
850
350
1.0
1.5K
2K
100
.05
2.0
-20
+12
0
350
850
1.0
140
X1
X10
1.5K
140
0
1.0
850
350
X1
X10
1.5K
X1
140
X10
X0.1
X0.1
X0.1
2K
100
.05
2.0
-20
+12
2K
100
.05
2.0
-20
+12
(OCT)
(OCT)
(Hz)
(dB)
(dB)
(OCT)
(Hz)
(Hz)
(dB)
BAND 2
BANDWIDTH
FREQUENCY
BAND 1
BANDWIDTH
FREQUENCY
HIGH CUT
CUT/BOOST
LOW CUT
INPUT
SYSTEM
CUT BANDS
850
0
1.0
350
0
1.5K
140
X1
X10
350
850
1.0
18K
1.5K
42K
X1
5K
115
X10
140
X0.1
X0.1
65K
3K
100
2K
.05
+12
2.0
-20
2K
100
.05
2.0
-20
50
22
U
ACTIVE
E
8
BYPASS
551
EQUALIZER
PARAMETRIC
FIVE BAND
POWER
CLIP
-15
260
+15
6
LEVEL (dB)
(OCT)
(Hz)
(dB)
(OCT)
(Hz)
(dB)
+12
CUT/BOOST
E
LYNNWOOD, WA, USA
MANUFACTURED IN
FIVE BAND PARAMETRIC EQUALIZER
INPUT
OUTPUT
BALANCED/
UNBALANCED
BALANCED
BALANCED
1
2
3
INPUT
BALANCED/
UNBALANCED
551
TIP = HIGH(+) = PIN 2
2
1
3
OUTPUT
RING = LOW(-) = PIN 3
SLEEVE = GND = PIN 1
RING
TIP
SLEEVE
PERSONNEL.
TO QUALIFIED SERVICE
PARTS. REFER SERVICING
NO USER SERVICEABLE
THIS UNIT CONTAINS
15 WATTS
MAXIMUM
AC INPUT
FABRIQUÉ AUX E.-U. PAR SYMETRIX INC., LYNNWOOD, WASHINGTON.
RÉFÉREZ TOUTE RÉPARATION À UN TECHNICIEN QUALIFIÉ.
TYPICAL BALANCED CONNECTIONS
Thank you for choosing the 551E Five Band
Parametric Equalizer or the 552E Dual Five Band
Parametric Equalizer. [With the exception of
Chapters 9 and 10, all text in this User's Guide is
applicable to both the 551E and 552E. For brevity
we will use the name “551E/552E” to refer to both
units.] Both models deliver superior fidelity,
flexibility, power, and precision through an
unbeatable combination of wide dynamic range,
ultra-low distortion, minimal phase shift and
ringing, easy to use controls and rock-solid
construction. The 551E/552E is a leap forward in
affordable equalizer technology.
The five, fully parametric EQ bands are identical
in function. Each delivers up to 12 dB of boost
and 20 dB of cut, has an adjustable bandwidth
control (from .05 octaves to 2 octaves), and a
frequency control range from 10 Hz to 20 kHz.
Use each band anywhere in the audio spectrum,
not just the pre-selected ranges you find on most
equalizers. This can be very useful in sound
system work, among other things. For instance,
you can use three bands to correct low frequency
problems and still have two bands left for
midrange and high frequency work.
You will find the 551E/552E is just as useful for
recording and broadcast applications. The
wide control range allows you to perform
creative as well as corrective equalization.
Sweetening vocal tracks, getting that huge drum
sound, disk mastering, or perfecting your radio
station’s signature sound are the kinds of tasks
that are well within the 551E/552E’s capability.
As for sonic quality... Our proprietary topology
delivers extremely low-noise audio performance
- the kind you would normally expect only from
a much more expensive unit. We have also
included a servo balanced output that com-
pletely removes all DC offset, and direct-
coupled input and output stages that maximize
the 551E/552E’s low-frequency response while
minimizing noise and distortion.
Inside and out, the 551E/552E is designed to
stand up to the worst abuse your roadies can
dish out. The tour-worthy all steel chassis
houses a double-sided fiberglass circuit board -
a significant advantage over the more common
phenolic PCBs. Gold-plated XLR connectors, a
bypass relay, and high precision components
ensure accuracy and reliability. Last, but not
least, the 551E/552E has an internal power
supply with a detachable cord.
Feel free to contact us if you have questions,
comments or suggestions at:
Phone
(425) 787-3222
Fax
(425) 787-3211
Website
www.symetrixaudio.com
Office hours - 8:00am - 4:30pm Pacific Time
(dB)
BAND 5
(OCT)
(Hz)
BANDWIDTH
CUT/BOOST
0
1.0
350
850
1.5K
(dB)
CUT/BOOST
BAND 4
(OCT)
(Hz)
FREQUENCY
BANDWIDTH
0
140
X1
X10
1.0
350
850
1.5K
140
(dB)
(OCT)
CUT/BOOST
FREQUENCY
(Hz)
BANDWIDTH
BAND 3
0
1.0
X1
X10
350
850
1.5K
X1
X10
140
FREQUENCY
+12
2.0
100
2K
.05
BAND 5
-20
(dB)
0
(OCT)
(Hz)
1.0
350
850
CUT/BOOST
BANDWIDTH
+12
1.5K
100
2K
.05
2.0
-20
X0.1
-20
+12
.05
100
2K
BAND 4
2.0
(dB)
0
(OCT)
(Hz)
1.0
350
850
BANDWIDTH
FREQUENCY
CUT/BOOST
X0.1
+12
.05
2.0
-20
2K
100
X0.1
BAND 3
(dB)
(OCT)
0
1.0
(Hz)
850
350
FREQUENCY
BANDWIDTH
CUT/BOOST
140
X1
X10
X0.1
-20
+12
1.5K
140
2K
100
.05
2.0
X1
X10
.05
2.0
+12
-20
X0.1
1.5K
X1
X10
140
100
X0.1
2K
FREQUENCY
BAND 2
(dB)
(OCT)
BANDWIDTH
(dB)
(Hz)
FREQUENCY
0
1.0
850
1.5K
350
0
140
X1
X10
BAND 1
BANDWIDTH
(OCT)
FREQUENCY
(Hz)
HIGH CUT
1.0
350
850
1.5K
18K
X1
X10
115
5K
42K
140
CUT/BOOST
LOW CUT
INPUT
LEVEL (dB)
CHANNEL 1
22
50
U
8
ACTIVE
BYPASS
CUT BANDS
-20
.05
2K
2.0
BAND 2
100
-20
+12
X0.1
(dB)
(OCT)
0
1.0
850
(dB)
350
0
(Hz)
FREQUENCY
BANDWIDTH
2.0
.05
2K
100
BAND 1
X0.1
3K
65K
(OCT)
(Hz)
1.0
850
350
42K
18K
5K
HIGH CUT
FREQUENCY
BANDWIDTH
CUT/BOOST
1.5K
-20
2K
.05
2.0
140
X10
X1
-20
+12
X0.1
100
1.5K
100
2K
2.0
.05
X1
X10
115
3K
65K
X0.1
140
260
6
+15
-15
CLIP
CHANNEL 2
LEVEL (dB)
50
22
U
ACTIVE
BYPASS
LOW CUT
INPUT
PARAMETRIC
EQUALIZER
DUAL
FIVE BAND
8
-15
+15
6
260
POWER
CLIP
CUT BANDS
552
E
+12
CUT/BOOST
+12
CUT/BOOST
1
3
2
2
1
3
OUTPUT
INPUT
CH1 INPUT
BALANCED
CH1 OUTPUT
UNBALANCED
UNBALANCED
BALANCED
BALANCED/
BALANCED/
SLEEVE = GND = PIN 1
RING = LOW(-) = PIN 3
TIP = HIGH(+) = PIN 2
SLEEVE
RING
BALANCED
TIP
BALANCED/
UNBALANCED
BALANCED/
UNBALANCED
BALANCED
CH2 OUTPUT
CH2 INPUT
TYPICAL BALANCED CONNECTIONS
ELECTRIC SHOCK DO NOT EXPOSE
TO REDUCE THE RISK OF FIRE OR
CAUTION
WARNING:
NE PAS OUVRIR
RISQUE DE CHOC ELECTRIQUE
No user serviceable parts inside. Refer servicing to qualified service personnel.
S’adresser a un reparateur compétent.
SEE OWNERS MANUAL. VOIR CAHIER D’INSTRUCTIONS.
Il ne se trouve a l’interieur aucune piece pourvant entre reparée l’usager.
AVIS:
THIS EQUIPMENT TO RAIN OR MOISTURE
552
E
AC INPUT
20 WATTS
MAXIMUM
RÉFÉREZ TOUTE RÉPARATION À UN TECHNICIEN QUALIFIÉ.
FABRIQUÉ AUX E.-U. PAR SYMETRIX INC., LYNNWOOD, WASHINGTON.
LYNNWOOD, WA, USA
MANUFACTURED IN
PARAMETRIC EQUALIZER
DUAL FIVE BAND
DO NOT OPEN
RISK OF ELECTRIC SHOCK
552E Front and Rear panels
