Welcome to the Telex Intercom Headsets support section. This section of the website is designed to help end users troubleshoot their own systems quickly and effectively. All of the content in this support section is authored and maintained by Telex Intercom Headsets technicians with extensive field experience. If you are a first-time user, Telex recommends reading through the FAQ and Knowledgebase sections to familiarize yourself with system design and operation. If you still have questions, contact your nearest Telex Intercom Headsets technical support specialist.

 Featured FAQ

How long is the Telex warranty?

Please contact your nearest Telex representative regarding warranty terms on specific products.
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 Featured Glossary Term

Headphones/Headsets

Headsets are headphones with microphones added. Headphones and headsets are available in a wide range of variations. Some of the variations include: Lightweight, Heavyweight, Medium Weight: Lightweight can often be used or worn for a ten hour shift with only mild discomfort; medium weight usage ranges from two to six hours continuous, and heavy weight usage ranges from 15 minutes to 2 hours. Acoustic Isolation: which varies from 0dB to 40dB. Usually more isolation means a heavier headset. Acoustic Isolation (30dB to 40dB) is required in high ambient noise environments such as concerts, auto racing, construction areas, aircraft engine run-up, near machinery such as printing presses. Medium isolation (10dB to 20dB) is required in quieter concerts, near crowds, near quieter machinery. Low acoustic isolation can be tolerated in environments such as television studios (news). Impedances: Impedances of headphones range typically from 2000Ω to 2Ω. Common impedances per earphone are 300Ω, 150Ω, 50Ω, and 25Ω. Headphone total impedances depend on the earphone impedance and whether they are connected in series or parallel. The headphones in standard headsets manufactured by Telex range from 25Ω to 300Ω. Military headphones may be very low impedance, 10Ω or less. A fuel tank entry system sold by RTS Systems has 2000Ω headphones. Lower impedance headphones allow a louder sound (up to 110dB SPL) to be generated with relatively low voltage in the user station (say 12 volts DC). Microphone Types: (for headsets) The microphones types may be carbon, carbon emulate, dynamic, electret. The carbon types produce high output levels but have higher distortion, the carbon emulate types, put out high levels with low to moderate distortion but require special electronics and a way to power the electronics. The electrets usually have electronics built on the microphone, but there is no voltage gain from this electronics, just impedance matching (from megohms to kilohms). Electrets have about 10dB more level than dynamics, but are very prone to "popping". To prevent popping, windscreens need to be installed or placed over the microphone element, and the following circuit should have a circa 500Hz high pass roll off. Dynamic and electret microphones usually have low distortion and good frequency response (100 to 8,000Hz). Some dynamic microphones made with low technology may have poor frequency response. Some typical microphones impedances are as follows: carbon: small button 600Ω, large button, 50Ω; dynamic: 2Ω (military), 150-200Ω (RTS Systems recommends), 600 1000 (lower cost push-to-talk and others). Microphone impedances can also be higher such as 50 kΩ, but these usually are not on headsets. Most RTS Systems User Stations microphone inputs allow for an impedance range of 50Ω to 1000Ω for dynamic microphones, 1000Ω to 2000Ω for electrets, 50Ω to 200Ω for carbon or carbon emulate.
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