Samson SERVO 120A - Manual (Page 2)

SERVO 120A
FEATURES
> Power to spare - Each channel delivers 60 watts of power
into 4 Ohms (or, in Bridge mode, 120 watts into 8 Ohms).
> Clean, crisp sound - Impressive audio specifications such as
.01% THD, S/N of 105 dB, crosstalk of 75 dB, and frequency
response of 3 Hz to 65 kHz guarantee ultra-clean sound
quality in any live or recording environment.
> Independent input level controls for each channel with
41-position detents.
> Ten-segment LED meters for each channel continuously
display power output levels and allow you to correct for
overloading (clipping) conditions.
> Front-panel Protection LED shows you at a glance
overheating or faulty wiring conditions.
> Innovative front-panel Speaker on/off switch and
dedicated headphone jack enables private cue monitoring
of the input signal.
> Both electronically balanced 1/4˝ TRS and unbalanced
RCA-type input connector jacks are provided along with
5-way binding post output connectors.
> Convection cooling (no fan) makes for whisper-quiet
operation even in critical listening environments such as
recording studios.
> Unique bipolar circuit design that continuously keeps DC
output during idling at or near 0 volts (thus keeping idle
speakers at their zero point). This serves to minimize heat
overload problems by effectively preventing the Servo 120a
from applying power when unnecessary.
> Protection relay circuitry (linked to the DC offset circuitry)
that prevents “thumps” when powering on or off. This means
that you can use the Servo 120a with a single power strip
into which a mixer or other audio devices are connected,
without danger of damage to connected speakers.
> Toroidal transformer power supply.
> Rugged construction (an all-steel chassis with a titanium
finish and a lightweight anodized aluminum heat sink)
makes the Servo 120a eminently roadworthy.
> Flexible design allows the Servo 120a to be used free-standing
or, with the use of included rack ears, mounted in any
standard 19˝ rack (taking just a single rack space).
> Three-year warranty.
ARCHITECT’S & ENGINEER’S SPECIFICATIONS
The Samson Servo 120a shall be a single space rackmount
stereo power amplifier. It shall deliver 60 watts per channel at
4 Ohms or 120 watts into 8 Ohms in bridge mono mode. It
shall have 1/4˝ balanced inputs and RCA unbalanced inputs.
It shall be a bi-polar design and use a toroidal transformer.
The front panel shall have volume controls and LED metering
for each channel. The front panel shall also have a headphone
output jack and an associated speaker mute switch. The rear
panel shall also have binding posts for the amplifier outputs.
432 mm
291 mm
44 mm
483 mm
SERVO 120A SPECIFICATIONS
Rated Output Power, per channel (@ 1 kHz)
Stereo mode
4 Ohm, <0.05% THD+N ..... 60 W
4 Ohm, 1% THD+N ............ 80 W
8 Ohm, <0.05% THD+N ..... 50 W
8 Ohm, 1% THD+N ............ 55 W
Bridge mode
8 Ohm, <0.05% THD+N ..... 120 W
8 Ohm, 1% THD+N ............ 150 W
Typical Distortion, per channel
THD+N (80 kHz LPF @
1 kHz rated output power) .... 0.01%
IMD (SMPTE 4:1, 60 Hz &
7 kHz @ rated output power) ... 0.03%
Signal To Noise Ratio
(22Hz - 22kHz
bandwidth @1dB below
rated output power) ............. 105 dB
Frequency Response ......................... 10 Hz - 20 kHz +0, -0.5 dB
3 Hz - 65 kHz, +0, -3.0 dB
Input Sensitivity ............................... -10dBv on the RCA inputs,
+4 dBu on the 1/4" inputs to
achieve rated power. (Level
control set to maximum)
Crosstalk (adjacent channels) ........... -75 dB, 1 kHz
Output DC Offset Voltage ................... ± 50 mV, DC Servo Controlled
Headphone Output Level .................... 400 mW (into 100Ω @
1% THD+N)
Dimensions (W x D x H) .................... 19 ˝ x 11.5˝ x 1.75˝
483mm x 292mm x 44mm
Weight ............................................ 15.4 lbs (7 kg)
PRODUCT SPECIFICATION SHEET
SERIES DESCRIPTION CATEGORY
SERVO 120A POWER AMPLIFIER AMPLIFIERS