RA102
Ten Channel
Pro Headphone Amplifi er
ROLLS CORPORATION
SALT LAKE CITY, UTAH
3/09
OPERATION GUIDE
SCHEMATIC
SPECIFICATIONS
Input Impedance: 10K Ohms unbalanced
Max Input Level: +18 dBV
Input Connectors: RCA, R & L balanced XLR
Outputs: 10: 1/4" TRS Stereo jacks
10: 1/8" (3.5 mm) TRS Stereo jacks
Max Gain: 20 dB/Channel
Frequency Response: 20 Hz - 30 kHz
S/N Ratio: 90 dB
THD: <.008%
IMD: <.008%
Phase Shift (In to Out): 0 deg.
Slew Rate: 2 V per microsecond
Crosstalk: - 65 dB
Power Rolls Model PS15 or PS12
Weight: 7 lbs (3KG)
Size: 19” x 1.75” x 3.125” (48cm x 4.5cm x 17cm)
Headphone impedance: 8 Ohms to 1000 Ohms
WARNING:
WARNING: THE MINIMUM HEADPHONE IMPEDANCE FOR THE RA102 IS 8
OHMS. THE MAXIMUM HEADPHONE IMPEDANCE IS 1000 OHMS.
IF YOU CONNECT AND USE THE RA102 WITH A LOWER HEADPHONE IMPED-
ANCE THAN LISTED ABOVE YOU WILL DAMAGE THE UNIT AND POSSIBLY OTHER
EQUIPMENT THAT IS CONNECTED TO THE RA102.
1
ROLLS CORPORATION
5968 S 350 W
MURRAY, UT 84107
1
RA102.SCH J
3 March 2009
Title
Size: Document Number:
Date:
Rev:
Sheet of
RA102 HEADPHONE AMPLIFIER
Rb
RIGHT
LEFT
JOIN OUT
AUX/JOIN IN
V+
R5
100
2
3
1
4
U11A
4560
6
5
7
8
U11B
4560
R9
10K
R4
10K
R10
100
J22
PHONE 1/4
J21
PHONE 1/4
R8
10K
R2
10K
1 2
3
J23
XLR JACK F
1 2
3
J24
XLR JACK F
R1
10K
R6
10K
R3
10K
R7
10K
1
2
J25A
RCAX2
2
3
J25B
RCAX2
12VAC/12-16VDC
V+
V+
V+
V+
6
5
7
8
U6B
4556
2
3
1
4
U6A
4556
6
5
7
8
U7B
4556
2
3
1
4
U7A
4556
6
5
7
8
U8B
4556
2
3
1
4
U8A
4556
2
3
1
4
U9A
4556
6
5
7
8
U9B
4556
R603
10
13
2
P6A
P100K X2
46
5
P9B
P100K X2
46
5
P8B
P100K X2
46
5
P7B
P100K X2
46
5
P6B
P100K X2
13
2
P7A
P100K X2
13
2
P8A
P100K X2
13
2
P9A
P100K X2
R702
10K
R701
10K
R802
10K
R801
10K
R902
10K
R602
10K
R601
10K
R903
10
R904
10
R804
10
R803
10
R703
10
R704
10
R604
10
C19
2200uf
R901
10K
C601
27PF
C701
27PF
C801
27PF
C901
27PF
C602
27PF
C702
27PF
C802
27PF
C902 27PF
V+
2
3
1
4
U10A
4556
6
5
7
8
U10B
4556
46
5
P10B
P100K X2
13
2
P10A
P100K X2
R1002
10K
R1003
10
R1004
10
R1001
10K
C1001
27PF
C1002 27PF
C5
10uf
Vb
C9
2200 UF
C10
47 UF
R11
18K
R13
22K
2
3
1
J26
JAPDC
D2
1N4001
D5
LDRR
R14
10K
Vb
V+
Vb
Vb
Vb
C4
10U
C8
10U
C1
10U
C2
10U
J17
PHONE 1/4
J18
PHONE 1/4
J19
PHONE 1/4
J20
PHONE 1/4
V+
V+
V+
V+
6
5
7
8
U1B
4556
2
3
1
4
U1A
4556
6
5
7
8
U2B
4556
2
3
1
4
U2A
4556
6
5
7
8
U3B
4556
2
3
1
4
U3A
4556
2
3
1
4
U4A
4556
6
5
7
8
U4B
4556
R103
10
13
2
P1A
P100K X2
46
5
P4B
P100K X2
46
5
P3B
P100K X2
46
5
P2B
P100K X2
46
5
P1B
P100K X2
13
2
P2A
P100K X2
13
2
P3A
P100K X2
13
2
P4A
P100K X2
R202
10K
R201
10K
R302
10K
R301
10K
R402
10K
R102
10K
R101
10K
R403
10
R404
10
R304
10
R303
10
R203
10
R204
10
R104
10
R401
10K
C101
27PF
C201
27PF
C301
27PF
C401
27PF
C102
27PF
C202
27PF
C30227PF
C402
27PF
V+
2
3
1
4
U5A
4556
6
5
7
8
U5B
4556
46
5
P5B
P100K X2
13
2
P5A
P100K X2
R502
10K
R503
10
R504
10
R501
10K
C501
27PF
C502
27PF
Vb
Vb
J11
PHONE 1/4
J12
PHONE 1/4
J13
PHONE 1/4
J14
PHONE 1/4
C7
10U
J6
3.5STJK
J7
3.5STJK
J8
3.5STJK
J9
3.5STJK
2
J1
3.5STJK
2
J2
3.5STJK
J3
3.5STJK
J4
3.5STJK
J5
3.5STJK
J10
3.5STJK
C18
2200uf
D4 1N4001
D1 1N4001
D3
1N4001
J15
PHONE 1/4
C11
503
C12
503
C13
503
C14
503
C15
503
C17
503
C16
503
C3
10U
C6
10U
J16
PHONE 1/4
V+
www.rolls.com
OUT
IN
MAIN OUTPUTS
ROLLS
PS12
SERIAL NUMBER
OUT
OUT
OUTOUTOUTOUT OUT OUT OUT
clip
www.rolls.com
RA102
PROFESSIONAL TEN CHANNEL HEADPHONE AMP
PWR
OUT
6
7 5 8 8 9 0 1 0 2 0
6
WARNING
USING THIS SYSTEM AT EXCESSIVE VOLUMES CAN CAUSE
PERMANENT HEARING DAMAGE.
USE AS LOW A VOLUME AS POSSIBLE
In order to use this system safely, avoid prolonged listening at excessive sound pressure
levels. Please use the following guidelines established by the Occupational Safety Health
Administration (OSHA) on maximum time exposure to sound pressure levels before hearing
damage occurs. 90 dB SPL at 8 hours
95 dB SPL at 4 hours
100 dB SPL at 2 hours
105 dB SPL at 1 hour
110 dB SPL at 1/2 hour
115 dB SPL at 15 minutes
120 dB SPL - avoid or damage may occur
NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWLEDGE OF AU-
DIO ELECTRONICS, BALANCED AND UNBALANCED CONNECTIONS, AND PROPER
SIGNAL LEVEL SETTING.
INSPECTION / WARRANTY
1. Unpack and inspect the RA102 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 visit our web site at www.rolls.com and click on the Register Your Warranty Here button, or
complete the Warranty Registration Card and return it to the factory.
Note: Descriptions for Channel One through Channel Ten are identical.
OUTPUTS 1 - 10 : 1/8” (3.5 mm) Tip-Ring-Sleeve jacks for connection to a standard pair of head-
phones or earphones.
VOLUME 1 - 10: Controls the amount of output signal from the indicated channel for both the front
1/8” and rear 1/4” jacks.
POWER LED: Indicates that the RA102 is connected to the power supply and is on.
POWER INPUT: Connects to the Rolls PS15 or Rolls PS12 (Included).
INPUTS: Left and Right - Balanced XLR jacks
- RCA Unbalanced jacks
Note: Descriptions for Channel Six through Channel One are identical.
OUTPUT: 1/4” TRS jack - parallels the channel’s front panel 1/8” Output jack.
JOIN: 2 X 1/4” TRS jacks (IN and OUT) for joining RA102’s together
REAR PANEL
FRONT PANEL
INTRODUCTION
Thank you for your purchase of the Rolls RA102 Professional Stereo Headphone Amplifi er. The
ROLLS RA102 is a ten-channel headphone amplifi er for professional audio monitoring. A variety of
input options are available including RCA and balanced XLR separate right and left. The JOIN section
is for connecting more than one RA102 directly together without any signal loss or impedance issues.
You can connect many RA102’s together with the JOIN function. Each channel has a 1/4” headphone
output jack on the rear for professional installations and a 1/8” jack on the front for ease of operation
(both jacks may be used at the same time if needed).
Determine which input confi guration you will use; either RCA or XLR stereo. Mono can be achieved
by connecting the mono input signal to both left and right inputs at the same time.
For a discreet right/left input confi guration, connect a balanced XLR, or RCA plug containing the
”Right” portion of the stereo signal to the Right Main Input. Connect a balanced XLR, or RCA plug
containing the “Left” portion of the stereo signal to the Left Input.
For a TRS stereo input confi guration, connect a Tip-Ring-Sleeve stereo to dual Tip-sleve (mono) RCA
jack cable. This is a very specifi c jack referred to as a insert jack and must be purchase at a specialty
store, to the rear panel LEFT and RIGHT RCA Input’s on the RA102. This cable may come from a
mixer’s AUX output for example.
To send a mono signal to the RA102: connect a mono XLR or RCA to both the LEFT and RIGHT
inputs at the same time this will require a specialty cable. The mono signal will be fed to both the right
and left sides of the headphone outputs.
CONNECTION
CAUTION:
CAUTION: Plugging a mono 1/4” or 1/8” TS plug into the Headphone Out-
puts on the front or rear of the RA102 will cause permanent damage to the unit
because one side would be shorted to ground.
Never plug a mono plug into
Never plug a mono plug into
any of the Headphone Outputs THE RA102 WILL BE PERMANENTLY DAM-
any of the Headphone Outputs THE RA102 WILL BE PERMANENTLY DAM-
AGED.
AGED.
Mono/Stereo Operation:
JOIN EXPLANATION:
The JOIN section is for connecting RA102’s directly together so you can use one source plugged into
the fi rst RA102 and by connecting them with the JOIN in and outs you can have as many headphone
outs as you have units.
To properly connect the JOIN: Plug source material into the fi rst RA102, then plug a TRS 1/4” cable
(also referred to as a 1/4” stereo cable) from the JOIN OUT of the fi rst unit into the JOIN IN of the
second unit. Repeat the JOIN in and out scheme for as many RA102’s as you need, only plugging the
source material in the very fi rst unit in the chain.
Connect the AC adapter to an outlet with the proper voltage. For installations there is intentionally no
Power switch designed on the front of the unit. To turn the RA102 off the power must be terminated
at the adapter. The RA102 was designed for professional applications were most functions are not
accessed from the front. In these applications it is acceptable for the unit to be left on. No damage will
occur to the RA102 in this application, it was designed for it.
Tip
Sleeve
(ground)
Tip
Ring
Sleeve
(ground)
This is a MONO
jack and should
never be plugged
into the Head-
phone Output of
a RA102.
This is a TRS or
stereo jack that
is compatible
with the RA102
Headphone
Outputs.
OUT
OUT
OUTOUTOUTOUT OUT OUT OUT
clip
www.rolls.com
RA102
PROFESSIONAL TEN CHANNEL HEADPHONE AMP
PWR
OUT
www.rolls.com
OUT
IN
MAIN OUTPUTS
ROLLS
PS12
SERIAL NUMBER
-
1
-
2
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