Rolls RA280 - Manual

RA280 Stereo Power
Amplifier
The RA280 is a stereo 80 WRMS/channel audio
power amplifier in a standard 19" 2U rack format.
It is intended for pro-audio and musical applica-
tions, and is ideal for a studio monitor amplifier,
small PA systems, or as a midrange/treble driver in
high power systems. The RA280 is a CD servo type
amplifier and is built solid with a painted steel
chassis, anodized aluminum front panel, a special
high performance toroid transformer, and fused
power lines. The MOSFET output stage is fault
protected and helps the RP280 forgive momentary
output shorts. CAUTION: As with all convection
cooled power amplifiers the heat sink (rear panel
fins) must have proper ventilation.
FEATURES:
• MOSFET drivers in a voltage and current gain
circuit
• 1 second turn-on delay
• LED power output meters
• Fault protected outputs
SPECIFICATIONS
Power Output, Stereo: 80 Watts RMS/ch. 4 Ω
50 Watts RMS/ch. 8 Ω
Bridged - 150 Watts RMS 8 Ω
Sensitivity: <1 VRMS for full output
THD: <.08% (1kHz @ 1 Watt)
S/N Ratio: 106 dBU
Power Bandwidth: DC - 30 kHz +/- 1dB
Damping Factor: > 150
Slew Rate: 100 Volts/microSecond
Phase Shift: <10 Deg., 20Hz - 20kHz
Input Impedance: 10 K Ω Balanced
Power: 120 VAC 60Hz 2.5A
230 VAC 50Hz
Size: 19” x 3.5” x 7.5”
(48 x 9 x 19 cm)
Weight: 12 lbs (5.5 kg)
ROLLS Coporation
5143 South Main Street, Salt Lake City, UT, 84107
(801) 263-9053 FAX (801) 263-9068
[email protected] • www.rolls.com
MADE IN U.S.A.
RISQUE DE CHOC - NE PAS ENLEVER
SERIAL NUMBER
WARNING: To reduce the risk of electric shock or
fire do not expose
this device to rain
or moisture.
CHANNEL 2 INPUT
CHANNEL 1 INPUT
BRIDGE NORMAL
OUTPUT 2
O
UTPUT 1
4A 120V - 2A 230 V
OUTPUT 1 OUTPUT 2
- - + +
MAINS POWER
WARNING For continued prootection against risk of fire, replace only with same type and rating of fuse.
CAUTION TO REDUCE THE RISK
OF
ELECTRI
C
SHOCK DO NOT
NOT REMOVE LI
D.
NO
USER SERVICABLE PARTS I
N
SIDE.
REFER SERVICI
NG TO QUALI
F
IED
SERVICE PERSONNEL
CO
RP
O
RAT
IO
N
VOL
UME 1
VOL
UME 2
R
A
280
PW
R
M
O
S
FET
P
OWER
A
M
P
LI
FI
ER
WAT
T
S
4
Oh
ms
1
4
2
8
8
0
WAT
T
S
4
Oh
ms
1
4
2
8
8
0