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
Ω
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.
