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 Sigtronics  Corporation 
178 East Arrow Highway 
San Dimas, CA   91773 
Phone: 909 305-9399 
E-mail: [email protected] 
Web Site: www.sigtronics.com

…when it counts!

Model ST-48S

Headset Instructions

The ST-48S series headset is adjusted at the factory for immediate use. The headset 

is equipped with a single plug and a coiled cord.

The headband is adjustable through a full range of motion, and the locking nuts 

may be tightened to allow you to custom fit the headphone. Place the headphone 

over your head and adjust the slides up until minimum pressure is felt on the top 

of your head. For maximum noise attenuation, the clamping pressure of the head-

band has been set at the factory. Releasing the clamping pressure by bending the 

headband is not advised, because loss of attenuation will result.

The microphone boom is fully adjustable and will rotate 180 degrees for use on 

the left or right side of the head.

Make sure you are speaking into the side of the mic labeled “Talk” or substantial 

loss of gain will occur. Microphone placement should be at the corner of the 

mouth, approximately ¼” from the lips.

When you first connect the headset, turn the volume control on the headset up 

to the full clockwise position, then adjust the listening volume with the audio 

control of either your radio or intercom as appropriate. If applicable, crew mem-

bers should also turn their individual headset volumes up fully. Doing this allows 

for a full range of adjustment for each passenger, since those with the most acute 

hearing can turn their headset volume down, if necessary.

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The headset parts may be cleaned with mild soap and water using a soft cloth. 

Then dry immediately. Caution: Do Not immerse any part of the headset in water 

or any other liquid. Be especially careful not to allow the microphone to become 

wet! Exposure to moisture may cause internal corrosion and failure and will void 

your manufacturers warranty.

Cleaning will help the headset maintain its “like new” condition for many years.

WINDSCREEN

The microphone windscreen will reduce annoying wind noise and breath pops 

picked up by headset microphones. It also protects the microphone element 

from dirt and moisture. The windscreen should be washed regularly to maintain 

hygiene and avoid clogging. Wash in warm water and mild soap. Rinse thoroughly 

and make sure it is completely dry before putting it back on.

To remove the windscreen, carefully grasp the windscreen lightly along its entire 

length and remove from the microphone element being careful not to twist the 

element itself.

Put the windscreen on the microphone by gently pulling from the open end. Do 

not pull it so tightly that it stretches against the end of the microphone.

WARRANTY

Your headset is covered by a limited two-year parts and labor warranty. Please see 

the enclosed warranty card for details.

You may refer to the parts list on the reverse side, if you choose to replace parts 

yourself. The parts list describes parts for this particular headset only. Parts lists 

for other models are available on our Web Site or can be obtained by contacting 

Sigtronics Corporation.

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