Rolls Stereo Amplifier RA62b User Guide

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.  
RA62b  
Six Channel  
Stereo Headphone Amplifier  
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.  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
LEVEL  
LEVEL  
LEVEL  
LEVEL  
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.  
PAN  
STEREO  
INPUT  
6 CHANNEL  
HEADPHONE AMPLIFIER  
MONO  
OUTPUT  
L
R
RA62b  
pwr  
STEREO  
LEVEL  
LEVEL  
LEFT INPUTS  
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.  
R
L
CHANNEL ONE  
1/4" OUT  
INSERT  
LEFT/MONO  
INPUT  
CHANNEL ONE  
1/8" (3.5 mm) OUT  
L
RIGHT/STEREO  
INPUT  
R
L
PAN  
CHANNEL TWO  
HEADPHONE OUT  
INSERT  
FRONT PANEL  
STEREO IN  
R
CHANNEL TWO  
1/8" (3.5 mm) OUT  
TO CHANNELS  
3 THROUGH 6  
RIGHT INPUTS  
ROLLS CORPORATION  
SALT LAKE CITY, UTAH  
5/03  
OWNERS MANUAL  
 
SCHEMATIC  
INTRODUCTION  
Thank you for your purchase of the Rolls RA62b Stereo Headphone Amplifier.The  
ROLLS RA62b is a six-channel headphone/earphone amplifier for professional  
audio monitoring. It is intended for recording studios, sound reinforcement, and  
audiophile listening environments where full frequency response signal(s) are to  
be distributed to up to six individuals. A variety of input options are available  
including 1/4", RCA, and balanced XLR. Since the MONO/STEREO switch is after  
the pan control, it will mix 2 MONO signals and their balance can be adjusted with  
the Pan control. Up to six individual monitor mixes may be listened to via the rear  
panel insert jacks. The RA62b features a FR4 double sided circuit board, socketed  
integrated circuits, and painted steel chassis.  
This manual assumes the user has a basic knowledge of audio electronic equip-  
ment.  
FEATURES  
• 6: 1/4" Headphone and 6: 1/8" (3/5 mm) Earphone Outputs per channel with  
Level Controls  
• 1/4" and 1/8" Outputs may be used simultaneously  
• 1/4", RCA and XLR Inputs  
• 6 TRS Stereo Insert jacks for separate use of each channel  
• Up to 600 mW output per jack - it's loud  
• Stereo/Mono Switch - allows mixing 2 mono signals  
• Front and rear panel input jacks  
• May be used as a six channel Distribution Amplifier  
• FR4 Double-sided fiberglass epoxy circuit board  
• Socketed ICs  
• Made in the U.S.A.  
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 Occupa-  
tional 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  
5
2
 
DESCRIPTION  
CONNECTION  
FRONT PANEL  
Connect the AC cord to a properly grounded ac outlet.  
PAN  
STEREO  
INPUT  
6 CHANNEL  
HEADPHONE AMPLIFIER  
MONO  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
Determine which input configuration you will use; either discreet right/left, TRS  
stereo, or mono.  
L
R
RA62b  
pwr  
LEVEL  
LEVEL  
LEVEL  
LEVEL  
LEVEL  
LEVEL  
STEREO  
Note: Descriptions for Channel One through Channel Six are identical.  
OUT 1 - 6 : 1/4” and 1/8” (3.5 mm) Tip-Ring-Sleeve jacks for connection to a  
standard pair of headphones or earphones. These jacks may be used simulta-  
neously.  
VOLUME 1 - 6: Controls the amount of output signal from the indicated channel.  
MONO/STEREO SWITCH: When this switch is pressed in, the Right and Left  
channels are summed together providing a mono output signal.  
PAN: Controls the relative amount of signal sent to the Right and Left output  
channels.  
For a discreet right/left input configuration, connect a balanced XLR plug contain-  
ing the “Right” portion of the stereo signal to the Right Main Input. Connect a  
balanced XLR plug containing the “Left” portion of the stereo signal to the Left  
Input.  
For a TRS stereo input configuration, connect a Tip-Ring-Sleeve stereo plug into  
the front panel STEREO IN input.This cable may come from a mixer’s headphone  
output for example.  
STEREO IN: 1/4” TRS input jack which parallels the rear panel Right and Left  
input jacks.  
POWER LED: Indicates that the RA62 is connected to the power supply and is  
on.  
The Aux Inputs are connected in the same manner as the discreet right/left input  
configuration listed above.  
To send a mono signal to the RA62b, connect an XLR jack to either Main Input, or  
a single 1/4” Tip-Sleeve or RCA plug into either Aux Input input and press in the  
front panel MONO/STEREO switch.This mono signal will be fed to both the right  
and left sides of the headphone outputs.  
REAR PANEL  
MAIN INPUTS  
AUX INPUTS  
RIGHT  
SERIAL NUMBER  
MODEL RA62b  
62-  
LEFT  
RIGHT  
INSERT  
6
INSERT  
5
INSERT  
4
INSERT  
3
INSERT  
2
INSERT  
1
LEFT  
CAUTION  
LEFT  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
RIGHT  
120 VAC  
50/60 Hz 15 VA  
MADE IN U.S.A.  
WARNING:  
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.  
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT NOT REMOVE BACK.  
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL  
RISQUE DE CHOC  
-
NE PAS ENLEVER  
120 VAC INPUT: Connects to a properly grounded AC outlet.  
INSERTS  
MAIN INPUTS: Balanced XLR jacks for connecting to the desired Right and Left  
program material.  
The inserts have been provided so you can directly access each headphone  
output with its own program material.  
AUX INPUTS: 1/4” and RCA unbalanced inputs - for use in the event additional  
program material is to be mixed with the main inputs, or if XLR plugs are not  
available.  
The inserts require Tip-Ring-Sleeve connectors, with right and left signals on the  
tip and ring respectively. If you use a TS mono plug - you will only hear sound out  
of one side.  
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 that corresponding output.  
Note:The description for the Channel Inserts pertains to all six channels.  
CHANNEL INSERTS: 1/4” TRS jacks which directly access the channel’s  
heaphone output circuitry. This is a stereo jack and requires a TRS stereo signal.  
CAUTION: Plugging a mono 1/4” TS plug into the Headphone  
Outputs may cause permanent damage to the unit because  
one side would be shorted to ground. NEVER PLUG A MONO  
PLUG INTO ANY OF THE HEADPHONE OUTPUTS.  
Tip  
Ring  
Sleeve  
(ground)  
4
3
 

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