Rolls RA53b User Manual
PS12
12V AC
www.rolls.com
SCHEMATIC
1
Rev:
5968 S 350 W
MURRAY, UTAH 84107
ROLLS CORPORATION
RA53b.SCH C
Rb
RA53b 5CH PRO HEADPHONE AMP
Title
Size: Document Number:
1
Sheet of
2 March 2003
Date:
RA53b
Stereo Headphone Ampli er
12
STEREO/LEFT
3
J19
XLR JACK F
R7
10K
R6
10K
2
J8B
RCAX2
3
R703
10K
R701
10K
C11
4560
R705
10K
120PF
R707
R709
47K
R711
C13
J7
J6
PHONE 1/4
R5
10K
2
3
4
VEE
U7A
1
J10
PHONE 1/4
10K
10K
2
3
4
VEE
U8A
4560
1
10U
12
MONO/RIGHT
3
J20
XLR JACK F
R10
10K
R9
PHONE 1/4
10K
R702
R8
10K
5
6
8
VCC
U7B
4560
7
10K
R708
10K
R710
5
6
8
VCC
U8B
4560
7
C16
10U
2
J8A
RCAX2
10K
1
R704
10K
120PF
R706
10K
C12
47K
R712
2N2907
C4
10K
P508
5
P5A
P100K X2
P5B
P100K X2
4 6
C10
120PF
C19
10UF 16V NP
3
2
4
VEE
U5A
4560
1
30
R503
2N2907
Q20
Q19
MPSA06
VCC
VEE
J5
PHONE 1/4
CHANNEL 5
120PF
4
VEE
30
Q8
2N2907
VEE
VEE
10
R502
J18
PHONE 1/8
J13
PC 1/4
10K
R307
2
P3A
P100K X2
P3B
P100K X2
1 3
C5
120PF
8
VCC
4560
VCC
Q9
MPSA06
4 6
6
5
U3B
7
30
R304
Q10
2N2907
VCC
VEE
10
R301
J3
CHANNEL 3
PHONE 1/4
VCC
1N4001
R308
J16
D9
LDSG
POWER
R57
4.7K
R2
R1
4.7K
4.7K
C14
1KUF
D1
D3
1N4001
231
J13
10K
5
C6
3
2
U3A
4560
1
R303
Q11
MPSA06
R302
PHONE 1/8
VEE
C15
1KUF
C18 503
D4
1N4001
D2
1N4001
JAPDC
SPECIFICATIONS
Input Impedance: 10 K ohms
Max Input Level: +18 dBV
120PF
4
VEE
30
Q12
2N2907
VEE
10
Max Gain: 26 dB per channel
Output Power: 221 mW per side, 442 mW per channel
(@ 32 Ohms)
Output Impedance: 10 Ohms
S/N Ratio: >90 dB
THD: <.08%
IMD (SMPTE): <.08%
Power: ROLLS PS12 - 12V AC
(Adapter Provided)
10K
R407
2
1 3
C7
120PF
6
5
8
VCC
U4B
4560
7
30
R404
Q14
VCC
Q13
MPSA06
10
R401
PHONE 1/4
CHANNEL 4
2
C1
120PF
8
VCC
4560
R104
VCC
Q1
MPSA06
J4
6
2N2907
R107
30
R101
P4A
VEE
PC 1/4
7
10K
R408
5
P100K X2
P4B
P100K X2
4 6
C8
3
2
U4A
4560
1
R403
Q15
MPSA06
VCC
10
R402
J17
PHONE 1/8
J11
10K
P1A
P100K X2
P1B
P100K X2
1 3
4 6
5
U1B
4560
Q2
Q3
2N2907
VCC
VEE
10
J1
PHONE 1/4
CHANNEL 1
VCC
120PF
R3
10K
R4
2N2907
10K
VEE
10K
R207
2
1 3
C3
120PF
6
5
8
VCC
U2B
4560
7
30
R204
Q6
VEE
VCC
Q5
MPSA06
10
R201
4
VEE
30
VEE
Q16
2N2907
10K
R108
5
C2
120PF
3
2
4
VEE
U1A
1
30
R103
Q4
MPSA06
10
R102
PHONE 1/8
J14
10K
R507
2
1 3
C9
120PF
6
5
8
VCC
U5B
4560
7
30
R504
Q18
VCC
Q17
MPSA06
10
R501
J12
PC 1/4
10K
R208
5
P2A
P100K X2
P2B
P100K X2
4 6
3
2
U2A
4560
1
2N2907
CHANNEL 2
R203
Q7
MPSA06
VCC
VEE
10
R202
J2
PHONE 1/4
J15
PHONE 1/8
Size: 8.4” x 1.7” x 5”
(21.3 x 4.3 x 13 cm)
Weight: 2.5 lbs (1.14 kg)
ROLLS CORPORATION
SALT LAKE CITY, UTAH
06/2011
Quick Start Guide
INTRODUCTION
PS12
12V AC
www.rolls.com
Thank you for your purchase of the Rolls RA53b Stereo Headphone Ampli er. This unit
was designed to provide years of dependable service. Please read this manual carefully to
ensure proper operation.
The RA53b is a ve-channel headphone/earphone ampli er 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 together, providing up to ten channels of headphone monitoring.
Finally - the RA53b is loud. It has plenty of gain for operation in noisy environments, and
works with most any headphone impedance.
DESCRIPTION
FRONT PANEL
INSPECTION
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.
WARRANTY
For complete Warranty information and registration, please visit 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.
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 con guration you will use; either discreet right/left, TRS stereo, or
mono.
For a discreet right/left input con guration, 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 con guration, 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
con guration 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 own program
material.
The inserts require Tip-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.
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 #PS12 - 12V AC power supply ONLY!!!
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 stereo TRS 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.
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