Symetrix 551E Specifications

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551E Five Band Parametric EQ

BAND 4

FREQUENCY BANDWIDTHCUT/BOOSTFREQUENCY BANDWIDTH

1.0

350 850

1.5K140

.05 2.0 -20 +12

2K100

551

FIVE BAND PARAMETRIC EQUALIZER

SYSTEM

LEVEL (dB) (OCT)(Hz)

ACTIVE BYPASS

POWER CLIP

-15 260+15 6

CUT BANDS

5022

115

BAND 1

BANDWIDTHFREQUENCYHIGH CUT CUT/BOOSTLOW CUTINPUT

(dB)

140

350 850

100

1.5K

1.0

.05 +122.0 -20

X10 X0.1X0.1

18K

42K

X10

65K3K

FREQUENCY

(Hz) (dB)

350

850

1.5K140

2K100

BAND 2

BANDWIDTH

(OCT)

1.0

.05 2.0 -20

CUT/BOOST

X10

+12

BAND 3

(dB) (dB)(OCT)(Hz)

1.0

850350

1.5K

140

2K100

.05 2.0 -20

X10

+12

UPERIOR FIDELITY, FLEXIBILITY, POWER, AND PRECISION. That’s what sets the 551E Five Band Parametric Equalizer apart from the rest. Delivering 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 is a leap forward in 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, and each 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

- the kind you would normally expect only from a much more expensive unit. We’ve also included a servo balanced output that completely removes all DC offset. Direct-coupled input and output stages maximize the 551E’s low-frequency response while minimizing noise

and distortion. 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.

Inside and out, the 551E is designed to stand

up to the worst road abuse. The tour-worthy

all steel chassis houses a double-sided fiberglass

circuit board - unlike the flimsy phenolic PCBs

found in most budget priced units. Gold plated

XLR connectors, a bypass relay, and high You’ll find the 551E is just as useful for recording and broadcast applications. The wide control range allows you to perform

precision components ensure accuracy and

reliability. Last, but not least, the 551E has an

internal power supply with a detachable cord. 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’s capability.

If you are an engineer in concert sound,

installed systems, recording, or broadcast,

contact your nearest Symetrix dealer today. See

for yourself why the audiophile performance

and uncompromising design of the 551E Five As for sonic quality... Our proprietary topology delivers extremely low noise audio performance

Band Parametric Equalizer make it the right

choice for any professional audio application. •

BAND 5

BANDWIDTH CUT/BOOSTCUT/BOOST

FREQUENCY

(Hz)

850350

140

X10

2K100

X0.1X0.1X0.1

(OCT)(OCT)(Hz)

1.0

1.5K

.05 2.0 -20 +12

(dB)

APPLICATIONS

Studio recording

Mastering

Feedback suppression in sound

systems

Room tuning

Radio and TV broadcast

Post production sweetening

FEATURES

Proprietary topology delivers

extremely low noise and

distortion

Five identical, fully overlapping

EQ bands

High cut and low cut filters

Servo balanced output (elimi-

nates DC offset)

Direct coupled inputs and

outputs (superb low frequency

response)

Symetrix, Inc. • Lynnwood, WA USA • Tel 425-787-3222 • Fax 425-787-3211 • www.symetrixaudio.comSymetrix, Inc. • Lynnwood, WA USA • Tel 425-787-3222 • Fax 425-787-3211 • www.symetrixaudio.com

Symetrix, Inc. • Lynnwood, WA USA • Tel 425-787-3222 • Fax 425-787-3211 • www.symetrixaudio.com

Internal power supply with

detachable cord

551E

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551E Five Band Parametric EQ

TYPICAL BALANCED CONNECTIONS

AC INPUT 15 WATTS MAXIMUM

FABRIQUÉ AUX E.-U. PAR SYMETRIX INC., LYNNWOOD, WASHINGTON.

RÉFÉREZ TOUTE RÉPARATION À UN TECHNICIEN QUALIFIÉ.

THIS UNIT CONTAINS NO USER SERVICEABLE PARTS. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

TIP = HIGH(+) = PIN 2 RING = LOW(-) = PIN 3 SLEEVE = GND = PIN 1

SLEEVE

RING

TIP

SPECIFICATIONS

Input/Output

Maximum Input Level +22 dBu Balanced Maximum Output Level +22 dBu Balanced, +18 dBu Unbalanced Input Impedance 20k Ohms Balanced, 10k Ohms Unbalanced Output Impedance 300 Ohms Balanced, 150 Ohms Unbalanced

Performance Data

Frequency Response +0 dB, -3 dB (20 Hz to 62 kHz) Dynamic Range >114 dB Signal to Noise Ratio >96 dB (unweighted, ref to +4 dBu, eq in, all bands flat) THD+Noise (1 kHz at +4 dBu) <0.002% (<10 Hz to 30 kHz measurement bw,

EQ Band Control

Frequency Control Range 10 Hz - 20 kHz (inc. Frequency Switch) Cut/Boost Range -20 dB, +12 dB Bandwidth .05 oct - 2.0 oct

eq in, all bands flat)

INPUTOUTPUT

OUTPUT

Cut Filters

Low Cut Filter Slope 12 dB/octave

INPUT

UNBALANCED

BALANCED/

UNBALANCED

BALANCEDBALANCED

Specifications subject to change without notice.

FIVE BAND PARAMETRIC EQUALIZER

551

MANUFACTURED IN

LYNNWOOD, WA, USA

Cutoff Frequency Range 6 Hz - 260 Hz High Cut Filter Slope 12 dB/octave Cutoff Frequency Range 3 kHz - 65 kHz

Physical

Size (hwd) 1.72 x 19 x 8.25 inches, 4.37 x 48.26 x 20.955 centimeters Shipping Weight 8 lbs, 3.64 kg

Electrical

Power requirements 117V nominal, 95 to 130V AC, 50 to 60 Hz, 15 watts

230V nominal, 165 to 255V AC, 50 Hz, 15 watts

551E ARCHITECTS AND ENGINEERS SPECIFICATIONS

The Parametric Equalizer (EQ) shall be a single channel unit that shall provide five independent bands of proportional-Q type filtering. There shall also be separate highpass and low-pass filters. The unit shall occupy one rack space (1U).

The EQ shall incorporate five identical filter bands. Each band shall have the following controls and control ranges: a cut/boost control with a -20 dB - +12dB range, a frequency sweep control with a 100 Hz 2kHz range, a frequency range multiplier switch with X10, X1, and X.1 settings, and a bandwidth control with a .05 octave - 2.0 octave range. There shall also be a 12 dB/ Oct high-pass filter with a user adjustable cutoff frequency range 1Hz to 250 Hz, and

a 12 dB/Oct low-pass filter with a cutoff frequency range from 2.5 kHz to 60 kHz. A front panel input level control shall provide ±15 dB of gain adjustment.

When the unit is inoperative (either by loss of power or via the BYPASS switch), the inputs and outputs will be wired together by a relay.

The frequency response with all filter bands flat, EQ in, high-pass and low-pass set to the outside extremes of their ranges shall be 20Hz - 62 kHz (+0, -3dB). The total harmonic distortion plus noise shall be less than 0.002% (EQ in, all bands flat). The dynamic range shall be greater than 114 dB. The EQ shall accept a maximum

551E

Symetrix, Inc. • Lynnwood, WA USA • Tel 425-787-3222 • Fax 425-787-3211 • www.symetrixaudio.com

input signal of +22 dBu and have a maximum output level of greater than +22 dBm. There shall be a front panel clip indicator that will illuminate at 1dB below clipping. It shall monitor the input, output and each EQ band.

The inputs shall be direct coupled, active balanced designs terminated with 3-pin XLR (AES/IEC standard wiring), and ¼" TRS female. The input circuitry shall incorporate RFI filters. There shall be a servo-balanced, direct-coupled output that shall terminate in 3-pin XLR (AES/IEC standard wiring) and ¼" TRS.

The EQ shall be capable of operating by means of its built-in power supply

connected to 117V nominal AC, 95-130V, 50-60 Hz (230V nominal AC, 165-255V, 50 Hz where applicable). Power consumption shall be 15 watts maximum. There shall be a rear panel receptacle for an IEC type detachable power cord. The EQ shall be UL and CE approved.

The unit shall be a Symetrix Incorporated model 551E Five Band Parametric Equalizer.