Rolls RA53b User manual

RA53b
Stereo Headphone Amplifier
OWNERS MANUAL
ROLLS CORPORATION
SALT LAKE CITY, UTAH
2/03
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be free from
defects in materials and workmanship under normal installation, use and service for a
period of one (1) year from the date of purchase as shown on the purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be limited to repair
or replacement (at our option), during the warranty period of any part which proves
defective in material or workmanship under normal installation, use and service, provided
the product is returned to Rolls Corporation, TRANSPORTATION CHARGES PRE-
PAID. Products returned to us or to an authorized Service Center must be accompanied by
a copy of the purchase receipt. In the absence of such purchase receipt, the warranty
period shall be one (1) year from the date of manufacture.
This warranty shall be invalid if the product is damaged as a result of deface-
ment, misuse, abuse, neglect, accident, destruction or alteration of the serial number,
improper electrical voltages or currents, repair, alteration or maintenance by any person or
party other than our own service facility or an authorized Service Center, or any use
violative of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties, obligations or
liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILITIES,
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, SHALL BE
LIMITED IN DURATION TO THE ONE YEAR DURATION OF THIS WRITTEN
LIMITED WARRANTY. Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL, INCIDENTAL
OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR ANY OTHER
WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER. Some states do not allow
the exclusion or limitation of special, incidental or consequential damages so the above
limitation or exclusion may not apply to you. This warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.

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 REGISTERYOUR 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
InputImpedance: 10 K ohms
Max Input Level: +18 dBV
Max Gain: 26 dB per channel
Maximum Output Power: 300 mW per channel
OutputImpedance: 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)
16

DESCRIPTION
FRONT PANEL
Note:Descriptions for Channel One through Channel Five are identical.
OUTPUT:1/4” and 1/8”(3.5mm) Tip-Ring-Sleeve jacks for connection to a
standard pair of headphones or earphones.Output impedance is 10 Ohms.
LEVEL: Controls the amount of output signal from the indicated channel.
POWER LED:Indicates that the RA53b is connected to the power supply and is
on.
REAR PANEL
POWER:For connection to a Rolls 12Volt (maximum) power supply.
RIGHT/MONO INPUT:1/4”TS jack for connecting the “Right”side of a stereo
signal.If used alone (nothing connected to the LEFT/STEREO jack), a 1/4”TS
plug with a mono signal will feed both sides of the RA53b Outputs.
LEFT/STEREO INPUT:1/4”TRS jack for connecting to the “Left”side of a stereo
signal.If used alone,(nothing connected to the RIGHT/MONO jack) a 1/4”TRS
plug with the “Right” side of the program material on the tip, and the “Left” side on
the ring may be connected for stereo operation.For example, a stereo headphone
output from a mixing console may be directly connected to the Left/Stereo jack via
a stereoTRS cable.
L /R INPUTS: RCA input jacks for connection to a signal source such as a CD or
cassette player.
BALANCED INPUTS:XLR input jacks for connection to a balanced line level
source such as the output of a mixer.
JOIN:1/4”TRS jack for connection to another RA53b JOIN jack.Linking two units
together provides 10 channels of monitoring from a master stereo signal, with six
channels having an insert option.
CHANNEL INSERTs: 1/4”TRS jacks for receiving a stereo signal and directly
accessing the indicated channel’s circuitry.
SCHEMATIC
2
5

CONNECTION
Connect the Rolls Power Supply to the POWER jack on the RA53b rear panel.
Connect the power supply to an ac outlet.
Determine which input configuration you will use;either discreet right/left, TRS
stereo, or mono.
For a discreet right/left input configuration, connect a 1/4”TS plug containing the
“Right” portion of the stereo signal to the Right/Mono Input.Connect a 1/4”TS
plug containing the “Left” portion of the stereo signal to the Left/Stereo Input.
If connecting a balanced signal, use the XLR inputs instead of the 1/4” inputs and
connect as indicated above.
For a TRS stereo input configuration, connect a Tip-Ring-Sleeve stereo plug into
the Left/Stereo input.This cable may come from a mixer’s headphone output for
example.Make sure nothing is connected to the Right/Mono Input.
To send a mono signal to the RA53b, connect a 1/4”Tip-Sleeve plug into the
Right/Mono Input.This mono signal will be fed to both the right and left sides of
the headphone outputs.Make sure nothing is connected to the Left/Stereo Input.
The RCA Aux Inputs are connected in the same manner as the discreet right/left
input configuration listed above.
To link another RA53b, simply connect a 1/4”TRS stereo cable to both JOIN jacks
on two RA53b units.
INSERTS
The Channel 1, 2 and 3 inserts have been provided so you can directly access
Channel 1, Channel 2 and Channel 3 headphone and earphone outputs with their
ownprogrammaterial.
The inserts requireTip-Ring-Sleeve connectors, with right and left signals on the
tip and ring respectively.
When these insert jacks are used, the main Right/Stereo and Left/Mono, as well
as the RCA and XLR Inputs - are disconnected to that channel. Only the stereo
signals sent to the Insert jacks go to the corresponding outputs.
OPERATION
Shown below is a possible connection/operation example for the RA53b. Head-
phones are connected to the Outputs on the front panel, and the other equipment
is connected to the rear panel Inputs as shown.The Left and Right Inputs to the
RA53b are connected to the mixer’s sub outputs, but could be connected to
auxiliary sends or even main outputs.The RCA Inputs are connected to a play-
back deck. For individual monitoring, a stereoTRS connector could be plugged
into a stereo auxiliary send from the mixer to an Insert jack on the RA53b.This
way, different material may be monitored on Channels 1, 2, and/or 3 than that of
the main inputs.A 1/4”Tip-Ring-Sleeve cable connects on RA53b JOIN jack to
another RA53b JOIN jack for ten channels of headphone/earphone monitoring.
34
12VAC/
DC MAX RIGHT/ MONO LEFT/ STEREO RIGHT LEFT JOIN 321
INSERTSINPUTS
R
L
MODEL RA53b
MADE IN
USA
Right and Left Sub Outs
For connection to
another RA53b