Rolls RA53 User manual

RA53
Stereo Headphone Amplifier
OWNERS MANUAL
ROLLS CORPORATION
SALT LAKE CITY, UTAH
3/00
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.
0 10
0 10
0 100 100 10
POWER
RA53
OUT
CHANNEL ONE
LEVEL OUT
CHANNEL TWO
LEVEL OUT
CHANNEL THREE
LEVEL OUT
CHANNEL FOUR
LEVEL OUT
CHANNEL FIVE
LEVEL

INTRODUCTION
Thank you for your purchase of the Rolls RA53 Stereo Headphone Amplifier.This
unit was designed to provide years of dependable 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 mixes may be monitored
using the main inputs and the two Insert jacks on Channels 1 and 2.
A 1/4” Link Input/Output jack is provided for connecting two RA53 units together,
providing up to ten channels of headphone monitoring.
Finally - the RA53 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 RA53 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 theWarranty 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 KΩ
Max Input Level: +18 dBV
Max Gain: 26 dB per channel
Maximum Output Power: 300 mW per channel
OutputImpedance: 10 Ω
S/N Ratio: >90 dB
THD: <.08%
IMD (SMPTE): <.08%
Power: 12VAC
(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
0 10
0 10
0 100 100 10
POWER
RA53
OUT
CHANNEL ONE
LEVEL OUT
CHANNEL TWO
LEVEL OUT
CHANNEL THREE
LEVEL OUT
CHANNEL FOUR
LEVEL OUT
CHANNEL FIVE
LEVEL
Note:Descriptions for Channel One through Channel Five are identical.
OUT:1/4”Tip-Ring-Sleeve jack for 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 power supply and is
on.
REAR PANEL
LEFT/
MONO
INPUT
RIGHT/
STEREO
INPUT
LINK
AUX
INPUTS
RIGHT
LEFT
CHANNEL 2
INSERT CHANNEL 1
INSERT
POWER
12VAC
MODEL RA53
MADE IN THE U.S.A
SERIAL NUMBER
53-
POWER:For connection to a Rolls PS12, or 12 VAC 300mA.
LINK:1/4”TRS jack for connection to another RA53 LINK jack.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.
For example, a stereo headphone output from a mixing console may be directly
connected to the Right/Stereo jack via a stereoTRS cable.
LEFT/MONO INPUT:1/4”TS jack for connecting to the“Left” side of a stereo
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 ChannelTwo output.
CHANNEL 1 INSERT: 1/4”TRS jack for receiving a stereo signal and directly
accessing Channel One output.
Date: January 25, 1996 Sheet 1 of 1 Size Document Number REV
BRA53.SCH
Title HEADPHONE AMPLIFIER RA53
ROLLS CORPORATION
R703 10K
R707
10K
R709
10K
J6
PHONE 1/4
J8 RCA PC
MONO/LEFT
R701 10K
2 3
1
0 4
U7A
4560
R705 10K
C11
120PF
R711
47K
R407
10K
VCC VEE
2 3
1
0 4
U8A
4560
R408
10K
1 3
2
P4A P100K X2
4 6
5
P4B P100K X2
C7
120PF
C8
120PF
CHANNEL 4
VCC VEE VEE
3 2
1
0
U4A
4560
6 5
7
8
U4B
4560
R401
10
J4
PHONE 1/4
R402
10
Q13
MPSA06
Q14
2N2907
Q15
MPSA06
Q16
2N2907
VCC
J11 PC 1/4
R403
30
R404
30
J1
PHONE 1/4
R107
10K
R108
10K
VCC VCC
VEE
VEE
VCC
R101
10
R102
10
3 2
1
0
U1A
4560
Q1
MPSA06
6 5
7
8
U1B
4560
1 3
2
P1A P100K X2
4 6
5
P1B P100K X2
Q2
2N2907
Q3
MPSA06
Q4
2N2907
C1
120PF
C2
120PF
R104
30
R103
30
J2
PHONE 1/4
R207
10K
R208
10K
CHANNEL 1 CHANNEL 2
VEE
VCC
VCC
VEE
VCC
VEE
R201
10
R202
10
6 5
7
8
U2B
4560
3 2
1
4
U2A
4560
1 3
2
P2A P100K X2
4 6
5
P2B P100K X2
Q5
MPSA06
Q6
2N2907
Q7
MPSA06
Q8
2N2907
C3
120PF
C4
120PF
R204
30
R203
30 J5
PHONE 1/4
VCC VEE
6 5
7
8 0
U5B
4560
R501
10
Q17
MPSA06
Q18
2N2907
J12 PC 1/4
R504
30 R712
47K
R507
10K
VCC
5 6
7
8 0
U8B
4560
VCC VEE
1 3
2
P5A P100K X2
C9
120PF
C13
10U
C16
10U J7
PHONE 1/4
R708
10K
VCC VEE
R704 10K
R710
10K
J9 RCA PC
STEREO/RIGHT
R702
10K
R706 10K
5 6
7
8 0
U7B
4560
C12 120PF
J10 PHONE 1/4
POWER
P508
10K
VEE
4 6
5
P5B P100K X2
C10
120PF
C? 15 NP
R1
4.7K
2 3 1
J13 JAPDC
CHANNEL 5
VCC
VCC VEE
Q20
2N2907
3 2
1
0 4
U5A
4560
R502
10
Q19
MPSA06
R503
30
C14
1K UF
C18 503
D3
1N4001 D1
1N4001
J3
PHONE 1/4
R307
10K
R308
10K
CHANNEL 3
VEE
VCC
VCC
VEE
VCC VEE
R302
10
R301
10
6 5
7
8
U3B
4560
3 2
1
4
U3A
4560
1 3
2
P3A P100K X2
4 6
5
P3B P100K X2
Q9
MPSA06
Q10
2N2907
Q11
MPSA06
Q12
2N2907
C5
120PF
C6
120PF
R304
30
R303
30
VEE
VEE
D2
1N4001
D4
1N4001
C15
1K UF
D9 LDSG
R2
4.7K
R57
4.7K
SCHEMATIC
2
5

CONNECTION
Connect the Rolls PS12 Power Supply to the POWER jack on the RA53 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/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 configuration, connect a Tip-Ring-Sleeve stereo plug into
the Right/Stereo input.This cable may come from a mixer’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
headphoneoutputs.
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 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 Aux Inputs - are disconnected.Only the stereo signals sent to the Insert
jacks go to the corresponding outputs.
OPERATION
Shown below is a possible operation example for the RA53.Headphones are
connected to the Outputs on the front panel, and the other equipment is con-
nected to the rear panel as shown.The Left and Right Inputs to the RA53 are
connected to the mixer’s sub outputs, but could be connected to auxiliary sends
or even main outputs.The RCA Auxiliary Inputs are connected to a playback deck.
For individual monitoring, a stereoTRS 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.
LEFT/
MONO
INPUT
RIGHT/
STEREO
INPUT
LINK
AUX
INPUTS
RIGHT
LEFT
CHANNEL 2
INSERT CHANNEL 1
INSERT
POWER
12VDC
MODEL RA53
MADE IN THE U.S.A
SERIAL NUMBER
53-
For connection to
another RA53
Right and Left Sub Outs
34