Rolls RA62b owner manual Schematic, Introduction, Features, dB SPL - avoid or damage may occur

SCHEMATIC

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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 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

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