Samson Servo 550 Users Manual

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• Rack-mount stereo power amplifier (3-space).

• 275 watts per channel into 4 ohms (stereo).

• 550 watts into 8 ohms (mono-bridged).

• 20 Hz to 50 kHz frequency response.

• Electronically balanced 1/4" TRS inputs.

• 1/4" and binding post outputs.

• Turn-on muting to prevent speaker “thumps.”

• Servo protection circuitry continuously keeps DC

output during idling at or near 0 volts (thus keeping idle

speakers at their 0 point).

• Protection circuitry against overheating and overcurrent.

• High-current output power transistors.

• Unique bipolar circuit design.

• Front-panel clip, idle and protection lights.

• Independent left- and right-channel input controls with

41-position detents.

• Convection cooled (No Fan).

• All-steel chassis with new black matte titanium finish and

lightweight anodized aluminum heat sink.

SERVO 550

AMPLIFIER

POWER

The Servo 550 excels in live performance use,

recording studios and permanent installations. Easy to

install, this 3-space rack-mount stereo power amplifier

(which can also be used in bridged mono mode) delivers

275 watts per channel into a 4 ohm load (in bridged

mono mode, 550 watts into 8 ohms), over a bandwidth

of 20 Hz to 50 kHz. It utilizes high-current output power

transistors and a unique bipolar circuit design that contin-

uously keeps DC output during idling at or near 0 volts.

The Servo 550 also features balanced 1/4" Tip-Ring-Sleeve

inputs and both 1/4″and binding post terminal outputs,

front-panel clip, idle and protection lights plus thermal

and overcurrent protection circuitry. The Servo 550 is con-

vection cooled for silent operation, eliminating fan noise

and the need for filter maintenance. Built rugged with a

solid steel chassis, the Servo 550 is designed for reliable per-

formance over the long haul.

SAMSON TECHNOLOGIES CORP., SYOSSET, NEW YORK

TO PREVENT SHOCK DO NOT OPEN. NO USER

SERVICABLE PARTS INSIDE. REFER SERVICING

TO QUALIFIED SERVICE PERSONNEL.

TO PREVENT FIRE OR SHOCK HAZARD DO NOT

EXPOSE TO RAIN OR MOISTURE.

CAUTION

HEATSINK MAY BE

HOT! DO NOT BLOCK

AIRFLOW OR OVER-

HEATING MAY OCCUR

RISK OF ELECTRIC SHOCK

DO NOT OPEN

SERIAL

NUMBER

F

U

S

E

FUSE

FUSE RATING

12A/250V (115V)

6A/250V (230V)

CAUTION !

~AC INPUT

115V/230V, 50/60HZ

400W (115V)1050W (230V)

USE CLASS 2 WIRING MAXIMUM LOAD IMPEDANCE 4Ω

RIGHT LEFT

OUTPUT 275 W/4Ω

SERVO 550 STUDIO AMPLIFIER

RIGHT

LEFT

INPUTS

(BALANCED

10KΩ/0dBm)

TIP RING SLEEVE

TIP +

RING -

SLEEVE GND

BRIDGED

MONO

STEREO

BRIDGED MONO -+

GROUND +RIGHT LEFT + GROUND

Contact:

Samson Technologies Corp., P.O. Box 9031, Syosset, NY 11791-9031 • Phone: (516) 364-2244 • Fax: (516) 364-3888 • www.samsontech.com

∞MAX ∞MAX

CLIP

IDLE

CLIP

IDLE

PROTECTION

SERVO - 550

STUDIO AMPLIFIER 275 WATT STEREO

POWER

SAMSON

Output Power (typical all channels driven):

4 Ω, 1 kHz, 1% THD, 324 W

4 Ω, 1 kHz, 0.5% THD, 275 W

8 Ω, 1 kHz, 1% THD, 235 W

8 Ω, 1 kHz, <.019% THD, 175 W

8 Ωbridged, 1 kHz, 1% THD, 650 W

8 Ωbridged, 1 kHz, < .08% THD, 550W

Frequency Response (-3 dB): <10 Hz to 85 kHz ±3 dB

Frequency Response (1 watt): 20 Hz to 20 kHz, -.4/-.25

Crosstalk (adj. channels): -74 dB, 1 kHz @ rated output

Distortion (THD+N, 20 Hz to 20 kHz) (80 kHz LPF):

at rated power: < .06%

at 1 watt: < .05%

Sensitivity (level control at maximum): +4 dBu

Damping Factor (8 Ω): > 100

Dynamic Range: 100 dB below rated output

(20 Hz to 22 kHz B.P.F.)

Input Impedance: >10 k Ωbalanced/> 10 k Ωunbalanced

Power Consumption: 360 W @ 120 V/60 Hz

395 W @ 220 V/50 Hz

Dimensions: 19″(w) x 5.2″(h) x 9.2″(d)

482mm (w) x 132mm (h) x 234mm (d)

Weight: 32.4 lb / 14.7 kg

ARCHITECT’S & ENGINEER’S

SPECIFICATION

The power amplifier shall be capable of stereo or

mono bridged operation. In stereo mode, it shall deliver a

minimum of 175 watts into loads of 8 ohms each with both

channels operating, or 275 watts into loads of 4 ohms each

with both channels operating. In mono bridge mode, it

shall deliver a minimum of 550 watts into an 8 ohm load. It

shall be passively cooled, and shall have internal short-circuit

and thermal protection circuitry. A protection LED indicator

shall activate and the power amplifier shall shut down to

protect against short circuits, overheating, severe overcur-

rent conditions or DC offset present at the outputs. The

power amplifier shall have slow start-up and muted inputs

on turn-on. Inputs shall be on balanced 1/4″tip-ring-sleeve

connectors and outputs shall be on 1/4″phone connectors

and on binding post terminals. The front panel shall have

independent level controls for left and right channels, a mas-

ter power switch and LED indicators for clip, idle and ampli-

fier protection.

The power amplifier shall have a frequency response

of 20 Hz to 50 kHz, signal-to-noise equal to or greater than

103 dB and THD less than 0.03%. Total power consumed at

full audio power shall be 838 watts (115 Vac) and 975

watts (230/240 Vac). The dimensions shall allow for stan-

dard 19″EIA rack mounting. It shall be 5.2″(132 mm; 3

rack spaces) high and 9.2″(234 mm) deep. Weight shall be

32.4 lb. (14.7 kg). The power amplifier shall carry a three-

year warranty.

The power amplifier shall be a SAMSON SERVO 500.

SERVO 550 SPECIFICATIONS

UL

®

5.0000

4.0000

3.0000

2.0000

1.0000

0.0

-1.000

-2.000

-3.000

-4.000

-5.000 0.0

.1000

.2000

.3000

.4000

.5000

.6000

.7000

.8000

.9000

1.000

20 100 1k 10k 50k

AUDIO PRECISION Servo 550 LEVEL (dBr) & THD+N (%) vs FREQ (Hz)

Ap

0 dB ref THD

Specifications subject to change without notice. ©1998 Samson

FREQUENCY RESPONSE