Rolls RA62b - Manual (Page 3)

SCHEMATIC
2
5
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