Page 1
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, TRANSPORTA TION CHARGES PREPAID. 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 defacement, 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,
RA53
Stereo Headphone Amplifier
CHANNEL ONE
OUT
LEVEL
CHANNEL TWO
OUT
LEVEL
CHANNEL THREE
0 100 100 10
LEVEL
OUT
CHANNEL FOUR
0 10
LEVEL
OUT
CHANNEL FIVE
0 10
OUT
LEVEL
POWER
RA53
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANT ABILITY 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.
ROLLS CORPORATION
SAL T LAKE CITY, UT AH
3/00
OWNERS MANUAL
Page 2
INTRODUCTION
SPECIFICATIONS
Thank you for your purchase of the Rolls RA53 Stereo Headphone Amplifier. This
unit was designed to provide years of dependab le service. Please read this
manual carefully to ensure proper operation.
The RA53 is a five-channel headphone amplifier with a variety of input options. In
addition to the four master mix inputs, three separate mix es ma y be monitored
using the main inputs and the two Insert jacks on Channels 1 and 2.
A 1/4” Link Input/Output jack is pro vided f or connecting two RA53 units together,
providing up to ten channels of headphone monitoring.
Finally - the RA53 is loud. It has plenty of gain f or operation in noisy environments, and works with most any headphone impedance.
INSPECTION
1. Unpac k and inspect the RA53 bo x and pac kage .
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 the Warranty Registration Card and return it to the factory.
TABLE OF CONTENTS
Introduction 1
Inspection 1
Table of Contents 1
Description
Front P anel 2
Rear Panel 2
Connection 3
Operation 4
Schematic 5
Specifications 6
Warranty Back Cover
Input Impedance: 10 KΩ
Max Input Level: +18 dBV
Max Gain: 26 dB per channel
Maximum Output P ow er: 300 mW per channel
Output Impedance: 10 Ω
S/N Ratio: >90 dB
THD: <.08%
IMD (SMPTE): <.08%
Po wer: 12 V AC
(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
Page 3
SCHEMATIC
DESCRIPTION
FRONT PANEL
REV
J6
PHONE 1/4
MONO/LEFT
J8
RCA PC
R703
10K
R701
10K
2
3
0
4
VEE
R705
R711
U7A
10K
4560
1
10K
R707
10K
R709
2
3
0
4
U8A
47K
4560
1
C13
10U
C11
120PF
J10
PHONE 1/4
VEE
J7
STEREO/RIGHT
R702
5
8
VCC
4560
5
8
VCC
4560
7
C16
10U
PHONE 1/4
J9
RCA PC
R704
R706
R712
10K
RA53.SCH
120PF
10K
C12
ROLLS CORPORATION
HEADPHONE AMPLIFIER RA53
B
Date: January 25, 1996 Sheet 1 of 1
Size Document Number
Title
Note: Descriptions for Channel One through Channel Fiv e are identical.
OUT: 1/4” Tip-Ring-Sleev e jac k f or connection to a standard pair of headphones.
LEVEL: Controls the amount of output signal from the indicated channel.
POWER LED: Indicates that the RA53 is connected to the po w er supply and is
on.
47K
10K
6
0
U7B
7
10K
R708
10K
R710
6
0
U8B
REAR PANEL
CHANNEL ONE
OUT
LEVEL
MODEL RA53
POWER
12VAC
MADE IN THE U.S.A
POWER: F or connection to a Rolls PS12, or 12 V AC 300mA.
LINK: 1/4” TRS jack for connection to another RA53 LINK jac k. Linking two units
together provides 10 channels of monitoring from a master stereo signal, with four
channels having an insert option.
RIGHT/STEREO INPUT: 1/4” TRS jack for connecting the “Right” side of a stereo
signal. If used alone , 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.
P100K X2
P5B
VEE
P508
5
P100K X2
4 6
3
0
4560
1
Q19
MPSA06
VCC
R502
PHONE 1/4
10K
2
4
U5A
R503
10
CHANNEL 5
D9
LDSG
R57
C?
15 NP
C10
120PF
30
VEE
2N2907
Q20
VEE
VCC
1N4001
D3
D1
R1
C14
1N4001
1K UF
231
4.7K
POWER
C18 503
4.7K
R2
4.7K
VEE
C15
1K UF
D4
1N4001
D2
1N4001
10K
R407
2
P4A
1 3
C7
120PF
6
5
8
VCC
U4B
7
30
R404
Q14
2N2907
MPSA06
R401
VEE
10
J4
VCC
Q13
P100K X2
P4B
4560
VCC
PHONE 1/4
5
P100K X2
4 6
3
0
4560
1
Q15
MPSA06
10
R402
10K
R408
C8
2
U4A
R403
CHANNEL 4
120PF
30
Q16
VEE
2N2907
10K
R507
2
P5A
1 3
C9
120PF
6
5
8
0
VCC
U5B
4560
7
30
R504
Q18
VEE
VCC
Q17
MPSA06
R501
2N2907
10
J5
LINK
CHANNEL TWO
OUT
RIGHT/
STEREO
INPUT
LEVEL
CHANNEL THREE
OUT
LEFT/
MONO
INPUT
0 100 100 10
LEVEL
RIGHT
AUX
INPUTS
LEFT
CHANNEL FOUR
0 10
LEVEL
OUT
SERIAL NUMBER
53-
CHANNEL FIVE
OUT
CHANNEL 2
INSERT
0 10
LEVEL
POWER
CHANNEL 1
INSERT
RA53
For e xample, a stereo headphone output from a mixing console ma y be directly
J11
PC 1/4
J12
PC 1/4
J13
JAPDC
connected to the Right/Stereo jack via a stereo TRS cab le .
LEFT/MONO INPUT: 1/4” TS jac k f or connecting to the “Left” side of a stereo
10K
P1A
P100K X2
4560
VEE
J1
P1B
P100K X2
4 6
0
4560
Q3
VCC
R108
5
3
2
U1A
1
R103
MPSA06
10
R102
PHONE 1/4
C2
120PF
30
CHANNEL 1
Q4
VEE
2N2907
10K
R207
2
P2A
1 3
C3
120PF
6
5
8
VCC
U2B
7
30
R204
2N2907
Q6
VEE
VCC
Q5
MPSA06
10
R201
J2
10K
R107
2
1 3
C1
120PF
6
5
8
VCC
U1B
7
30
R104
Q2
Q1
MPSA06
R101
2N2907
10
VCC
5
P100K X2
P2B
4560
VEE
VCC
R208
5
P100K X2
4 6
3
4560
1
Q7
MPSA06
R202
PHONE 1/4
10K
2
U2A
R203
10
C4
120PF
4
30
Q8
CHANNEL 2
VEE
2N2907
10K
R307
2
P3A
1 3
C5
120PF
6
5
8
VCC
U3B
4560
7
30
R304
Q10
VCC
VEE
Q9
MPSA06
R301
P100K X2
P3B
2N2907
VEE
10
J3
R308
5
P100K X2
4 6
Q11
VCC
PHONE 1/4
4560
10K
3
1
MPSA06
R302
2
U3A
10
C6
R303
CHANNEL 3
4
30
120PF
VEE
Q12
2N2907
VEE
signal. If used alone , a 1/4” TS plug with a mono signal will feed both sides of the
RA53 Outputs.
AUX INPUTS: RCA input jacks for connection to a signal source such as a CD or
cassette player.
CHANNEL 2 INSERT: 1/4” TRS jack for receiving a stereo signal and directly
accessing Channel Two output.
CHANNEL 1 INSERT: 1/4” TRS jack for receiving a stereo signal and directly
accessing Channel One output.
2
Page 4
CONNECTION
OPERATION
Connect the Rolls PS12 Pow er Supply to the POWER jack on the RA53 rear
panel. Connect the po wer 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/Stereo Input. Connect a 1/4” TS
plug containing the “Left” portion of the stereo signal to the Left/Mono Input.
For a TRS stereo input configur ation, connect a Tip-Ring-Sleeve stereo plug into
the Right/Stereo input. This cable may come from a mix er’s headphone output for
example.
To send a mono signal to the RA53, connect a 1/4” Tip-Sleeve plug into the Left/
Mono Input. This mono signal will be fed to both the right and left sides of the
headphone outputs.
The RCA Aux Inputs are connected in the same manner as the discreet right/left
input configuration listed above.
To LINK another RA53, simply connect a 1/4” TRS stereo cable to both LINK
jacks on two RA53 units.
INSERTS
The Channel 1 and Channel 2 inserts have been provided so you can directly
access Channel 1 and Channel 2 headphone outputs with their own program
material.
The inserts require Tip-Ring-Sleev e 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 Aux Inputs - are disconnected. Only the stereo signals sent to the Insert
jacks go to the corresponding outputs.
Shown below is a possible operation e xample for the RA53. Headphones are
connected to the Outputs on the front panel, and the other equipment is connected to the rear panel as shown. The Left and Right Inputs to the RA53 are
connected to the mixer’ s sub outputs, b ut could be connected to auxiliary sends
or even main outputs . The RCA Auxiliary Inputs are connected to a playback deck.
For individual monitoring, a stereo TRS connector could be plugged into a stereo
auxiliary send from the mixer to an Insert jack on the RA53. This way, different
material may be monitored on Channels 1 and/or 2 than that of the main inputs.
For connection to
another RA53
MODEL RA53
POWER
12VDC
MADE IN THE U.S.A
LINK
RIGHT/
STEREO
INPUT
LEFT/
MONO
INPUT
RIGHT
AUX
INPUTS
LEFT
Right and Left Sub Outs
SERIAL NUMBER
53-
CHANNEL 2
INSERT
CHANNEL 1
INSERT
3
4
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