Rolls RA280 User Manual

Ra280 stereo power amplifier, Ra 280, Os fet

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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

50 Watts RMS/ch. 8

Bridged - 150 Watts RMS 8

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

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

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