Samson Servo 550 User Manual

• 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 continuously 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 convection cooled for silent operation, eliminating f an noise and the need for filter maintenance. Built rugged with a solid steel chassis, the Servo 550 is designed for reliable performance 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 OVERHEATING MAY OCCUR

RISK OF ELECTRIC SHOCK

DO NOT OPEN

SERIAL

NUMBER

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, Sy osset, 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 Ω bridged, 1 kHz, 1% THD, 650 W

8 Ω bridged, 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 Ω balanced/> 10 k Ω unbalanced 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 overcurrent 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 hav e independent level controls for left and right channels, a master power switch and LED indicators for clip, idle and amplifier 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 standard 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 carr y a threeyear warranty.

The power amplifier shall be a SAMSON SERVO 500.

SERVO 550 SPECIFICATIONS

FREQUENCY RESPONSE

0 dB ref THD

5.0000

4.0000

3.0000

2.0000

1.0000

0.0

-1.000

-2.000

-3.000

-4.000

-5.000 0.0

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

20 100 1k

10k

1.000

.9000 .8000

.7000

.6000 .5000

.4000 .3000 .2000 .1000

50k