Rolls RA170 User manual

RA170
70 VOLT / 70 WATT POWER
AMPLIFIER
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IMPORTANT NOTICE: THIS UNIT IS NOT
DESIGNED TO DRIVE SPEAKERS
DIRECTLY, IT IS FOR OPERATION IN 70
VOLT SYSTEMS. TOTAL TAPS SHOULD
NOT EXCEED 70 WATTS.
ROLLS CORPORATION
SALT LAKE CITY, UTAH
10/10
70V OUTPUT
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
MODEL RA170
SERIAL NUMBER
170-
WARNING:
DO NOT EXPOSETHIS EQUIPMENT TO RAIN OR MOISTURE
RISQUE DE CHOC - NE PASENLEVER
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE BACK
NO USER SERVICABLE PARTS INSIDE. REFER SERVICINGTO QUALIFIED SERVICE PERSONNEL
MAIN INPUTS
120VAC 50/60Hz 100VA 1.5A Fuse

INTRODUCTION
Thank you for your purchase of the ROLLS RA170 70 Volt / 70 Watt Power Am-
plier. The RA170 is a virtually indestructible single rack space amplier intended
for the contractor and install market. It requires no transformer coupling to drive
70 volt speakers directly. The mono unit features both RCA and 1/4” inputs. The
70 volt speaker outputs are provided via spring-loaded terminals.
DESCRIPTION
FRONT PANEL
VOLUME: This control adjusts the output level of the RA170.
PWR: LED indicating the unit’s power status.
CLIP: These LEDs light in the event of RA170 circuit overload.
REAR PANEL
70V OUTPUT
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
MODEL RA170
SERIAL NUMBER
170-
WARNING:
DO NOT EXPOSETHIS EQUIPMENT TO RAIN OR MOISTURE
RISQUE DE CHOC - NE PASENLEVER
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE BACK
NO USER SERVICABLE PARTS INSIDE. REFER SERVICINGTO QUALIFIED SERVICE PERSONNEL
MAIN INPUTS
120VAC 50/60Hz 100VA 1.5A Fuse
120 VAC 50/60 HZ 15 VA: IEC Power Cord. Connect to a properly grounded
AC source. NOTE: REPLACE THE FUSE WITH ONLY THE PROPER RATED
FUSE. INSTALLING A FUSE OTHER THAN THE RECOMMENDED RATING
WILL DAMAGE THE UNIT.
70V Output: Spring loaded terminals to be connected to 70 Volt speaker connec-
tions. No special transformers are required.
MAIN INPUTS: 1/4”and RCA jacks to be connected to line level signal to be am-
plied. Note: Do not use both jacks simultaneously as both jacks are tied directly
together.
BURN WARNING!
THE FRONT PANEL OF THE RA170 IS THE HEAT DISTRIBUTION FOR THE
OUTPUT STAGE. IF THE UNIT IS OPERATED AT HIGH VOLUMES, IT MAY
GET HOT.
INSTALLATION
Mount the RA170 in a safe and sturdy rack. Connect the output of the signal
source to the selected input of the RA170. Connect the 70V Output terminals to
the 70 volt speakers.
Plug the AC cord into a properly grounded AC outlet.
Send signal to the RA170 and adjust the VOLUME control for a comfortable
listening level.
SPECIFICATIONS
Recommended Load: 70 Volt line (70 Watts maximum)
Frequency Response: 70Hz to 20 kHz
Equiv. Input Noise: 100 microVolt typical, A weighted
600 Ohm input
S/N Ratio: 114 dB @ 70 Watts
Gain: 40 dB
Input Impedance: 47 k Ohms
Size (W x H x D): 19” x 1.75”x 5” (48 x 4.5 x 12.7)
Weight: 5.5 lbs (2.5 kg)
SCHEMATIC