®
Telex
Description and Wiring Diagrams
Model PH-3500 Headset (300623 Series)
General Description
The Telex PH-3500 is a passive noise attenuating head-
set for use in a noisy environment. Dual controls allow
the user to individually adjust the volume level for each
ear. Usingthelatestdesignandmodelingtechniques,Telex
has been able to maximize the amount of hearing pro-
tection provided by the PH-3500, while at the same
time minimizing weight. The PH-3500 has a noise re-
duction rating of 24 dB, and is suitable for use in noisy
environments. The PH-3500 features a unique headband
design that provides comfort for long periods of time.
Two versions of the PH-3500 are available: with a male
or female XLR4 connector.
Design Features
Comfortable foam-filled headband pad and ear cushions. The headband pad evenly distributes the headset weight, with no pressure
points, for maximum comfort. The ear cushions combine comfort and light weight with an excellent acoustic seal. An outer urethane
layer ensures long life. Gel-filled ear cushions are also available for this headset for users who prefer this type. All cushions are field-
replaceable.
Boom Microphone: The boom arm features a sealed ball-and-socket joint and flexible boom for precise microphone placement
on any head size. The boom and cord rotate for microphone placement on either side of the head. The microphone cartridge is an
electret condensor element. The microphone housing and cartridge are easily removed for replacement.
Cordage: The microphone cordage is protected inside the boom arm. Shielded wire throughout the headset protects against RFI
and EMI. Strain-reliefs on all cords provide maximum durability.
Operation
Headband Pressure Adjustments
There are three pressure settings. Increasing the pressure will improve the seal between the earcup and the head for greater noise
reduction. To change the pressure setting, remove the headset and fold the earcup inward as shown, then rotate the adjustment
knob to the desired setting. Repeat for both earcups. Both sides of the headband should be set to the same pressure setting to keep
the headband properly centered on the head.
HIGH
MEDIUM
LOW
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