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INTRODUCTION

Thank you for your purchase of the PM52 Headphone Tap. The PM52 is for
connecting headphones to a speaker line. The 1/4" Mono/stereo loop jacks
are for cascading more boxes in series. There are two headphone jacks
and volume control. The Headphone Tap uses the speaker line signal for
power, therefore requires no batteries or external power.

DESCRIPTION

MONO/STEREO Switch: Selects between a Mono or Stereo input mode.
POWER AMP LOOP: Two paralleled 1/4" stereo TRS jacks, one for
receiving the input signal and the other for connecting to a speaker or
other input device.
VOLUME: Controls the level of the signal to the headphones.
HEADPHONES: Two 1/4" stereo TRS jacks for connection to stereo
headphones.

     

                   

VOLUME

HEADPHONE

OUTPUTS

MONO

STEREO

POWER AMP LOOP

HEADPHONE

TAP

PM52

SPECIFICATIONS

Input Impedance:

150 

Size:

2.25" x 2.5" x 1.25"
(5.7 x 6.3 x 3.2 cm)

Weight:

1lb (.45 Kg)

SCHEMATIC

J3

PHONE 1/4

R2

150

P1B

5KA

STEREO

  1

2

  3

SW1A

DPDT

J1

PHONE 1/4

J2

PHONE 1/4

MONO

R1

150

J4

PHONE 1/4

P1A

5KA

Date:

 February 25, 1994

Sheet

    1

of

    1

Size

Document Number

REV

A

PM52

Title

PM52 HEADPHONE TAP

ROLLS CORPORATION

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

It is difficult to measure the exact Sound Pressure Levels (SPL) present at the
eardrum in live applications. In addition to the volume setting on this Personal
Monitor unit, the SPL in the ear is affected by ambient sound from floor wedges or
other devices. The isolation provided by the fit of quality earphones is also an
important factor in determining the SPL in the ear.
Follow these guidelines in the use of this product to protect your ears from
damage:
1. Turn up the volume only to the point where hearing is comfortable.
2. Ringing in the ears may indicate that the levels are too high. Lower the volume
level.
3. Have your ears checked by an audiologist on a regular basis. If you experience
wax buildup in your ears, stop using the system until an audiologist has examined
your ears.
4. Wipe the earphones with an antiseptic before and after use to avoid infections.
Stop using the earphones if they are causing great discomfort or infection.

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