INTRODUCTION
Thank you for your purchase of the Rolls RA53b Stereo Headphone Amplifier.
This unit was designed to provide years of dependable service. Please read this
manual carefully to ensure proper operation.
The RA53b is a five-channel headphone/earphone amplifier with a variety of input
options. In addition to the four master mix inputs, four separate mixes may be
monitored using the main inputs and the three Insert jacks on Channels 1, 2, and
3.
A 1/4” JOIN Input/Output jack is provided for connecting two RA53b units to-
gether, providing up to ten channels of headphone monitoring.
Finally - the RA53b is loud. It has plenty of gain for operation in noisy environ-
ments, and works with most any headphone impedance.
INSPECTION
1. Unpack and inspect the RA53b box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a
damage claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please complete our online Warranty Registration by visiting our website;
www.rolls.com. Click on the REGISTER YOUR WARRANTY HERE line. Or,
complete the Warranty Registration Card and return it to the factory.
TABLE OF CONTENTS
Introduction
1
Inspection
1
Table of Contents
1
Description
Front Panel
2
Rear Panel
2
Connection
3
Operation
4
Schematic
5
Specifications
6
Warranty
Back Cover
SPECIFICATIONS
Input Impedance:
10 K ohms
Max Input Level:
+18 dBV
Max Gain:
26 dB per channel
Maximum Output Power:
300 mW per channel
Output Impedance:
10 Ohms
S/N Ratio:
>90 dB
THD:
<.08%
IMD (SMPTE):
<.08%
Power:
12 VAC\DC
(Adapter Provided)
Size:
8.4” x 1.7” x 5”
(21.3 x 4.3 x 13 cm)
Weight:
2.5 lbs (1.14 kg)
1
6
