Telex MCE325 manual Front Panel Headset Connections

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Separate shielded twisted pair cables: 50 feet (15.24 m). Balanced microphone input: up to 100 feet (30.48 m).

External Electret Microphone

An external electret microphone may be connected at the auxiliary connector and used in place of a front-panel gooseneck microphone. Connect microphone high/bias to pin 15 and connect microphone low to pin 2. When using an external microphone, do not connect a front-panel gooseneck microphone.

Unswitched Microphone Output

The microphone audio is provided as an unswitched, balanced output at the auxiliary connector. The in-phase signal is available at pin 1; the inverted-phase is available at pin 14.

External DC Power Source

The MCE325 may be powered from an external DC power supply in the 10 to 25 volt range (500 mA minimum).

If the external supply is in the 10 to 15 volt range, connect the positive lead to pin 13 of the auxiliary connector and connect the minus lead to pin 10 or 11. A 0.5 Amp slo-blo fuse should be connected in-line for 17 to 24 volt operation.

Remote Speaker Mute Control

When the MCE325 is used with an external speaker, the speaker may be muted from a remote location. Applying a logic low signal to pin 25 of the auxiliary connector will cause muting. Connect circuit common to pin 11.

Front Panel Headset Connections

Headset Requirements

Use headphones with an impedance of 25 ohms or greater. Low impedance 8 ohm headphones are not recommended. Headphones with good acoustic isolation (20 to 40 dB) improve communication in high ambient noise environments, and allow the user to use the headphones at a less tiring, lower volume.

Headset Connections

Dynamic-microphone headset connector: XLR-6 type receptacle.

Table 2.8 Dynamic-microphone headset connector.

PIN #

FUNCTION

 

 

1

Balanced mic low/unbalanced mic common

 

 

2

Balanced/unbalanced mic high

 

 

3

Headphone/mic switch common

 

 

4

Headphone left

 

 

5

Headphone right

 

 

6

Mic Switch high

 

 

2-11

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Contents Model MCE325 Proprietary Notice Return Shipping Instructions End-User License Agreement for Telex Software Table of Contents Operation Diagrams Page Description FeaturesGeneral Connections, Inputs and Outputs Front Panel FeaturesIntercom Lines Rear Panel FeaturesMounting Configuration PowerProgramming Headphone Amplifier MCE325 SpecificationsPower and Mechanical Microphone PreamplifierConnectors MCS325 SpecificationsStandard four-channel, two-wire configuration Standard two-channel, four wire configuration Page 10M C E 3 2 5 U s e r I n s t r u c t i o n s 11 MCE325 button configurations 12M C E 3 2 5 U s e r I n s t r u c t i o n s Internal Programming and Adjustments InstallationSwitch Number Switch Function Default Setting Jumper Number Jumper Function Default Setting Internal DIP switches, jumpers and level trimmers Remote Talk-off DS7 Front Panel Setup Mode Lock-out DS4Program Assignment IFB Option J4, J5, J16-J18 Mechanical InstallationHeadphone Sidetone Trimmer Adjustment R37 Speaker Dim Adjustment R157Mounting configurations AC Power and Fuse Electrical InstallationIntercom Lines J8, J9, and J10 External Speaker, J27 Auxiliary Connector, J22Four-Wire Channel a and B Input Program Inputs, J14 and J15External Headset Remote Microphone SwitchKey outputs Expanded IFB Option ISO ConnectionFront Panel Headset Connections Carbon-microphone headset connector Momentary/Latching Button action LED IndicatorsGeneral Operating InstructionsMicrophone On/Off Volume AdjustmentFront Panel Sidetone Nulling Trimmer Adjustment Panel Mic/Headset Mic SelectionFront Panel Programming Four-channel Listen Call DisableLatch Disable Channel IDInstant Mic Reset6C S I 2 0 0 U s e r I n s t r u c t i o n s Factory Support Information Preventive MaintenanceCorrective Maintenance AccessTest Equipment Test and Adjustment ProceduresCleaning Power Supply TestKeying Output Test Initial ConfigurationFrequency Response and Level Check, Mic to Line Four-Channel, Two-Wire ModeTwo-Channel, Four-Wire Mode Sidetone Null Test and AdjustmentTalk Button Test Point Potentiometer True Sidetone AdjustProgram a to Left Headphone Program B to Right Headphone IFB TestProgram to Speaker Four-Wire B input to Right Headphone Four-Wire a Input to Left HeadphoneMic Kill Receive Test Panel Mic to Channel TestCarbon Mic to Channel Test VOX TestCall Transmit Test Mic Kill Transmit TestCall Receive Test Noise Checks Remote Mic Switch TestISO Test Program Lockout TestPage 14C S I 2 0 0 U s e r I n s t r u c t i o n s Final Assembly, MCE325 Packaging AssemblyFront Panel Assembly Heatsink Assembly Back Panel AssemblyMain PC Board Assembly 4C S I 2 0 0 U s e r I n s t r u c t i o n s Reference 9027-6245-01 Drawing, Section CR1 FB1 #73 Shield Bead 8C S I 2 0 0 U s e r I n s t r u c t i o n s Reference 9027-6245-01 Drawing, Section 10C S I 2 0 0 U s e r I n s t r u c t i o n s RP2 Washer Flat DS1-DS8 PC Board Assembly, Front Panel14C S I 2 0 0 U s e r I n s t r u c t i o n s Diagrams 2C S I 2 0 0 U s e r I n s t r u c t i o n s Date 7/23/01 Title D\TEMP\AS624501D.cal Title D\TEMP\AS626101C.cal Title D\TEMP\AS626201C.cal Date 7/19/01 Title D\TEMP\AS646401G.dwg Title D\TEMP\BD646401A.cal Title D\TEMP\IS671801A.cal Title D\TEMP\OD635501A.cal Title D\TEMP\OD635502A.cal Title D\TEMP\OD635503A.cal Title D\TEMP\OD635504A.cal Title c\home\cms\benedil\view\9000-646401.CAL Telex Mother Board Mother Board MCE325 Title D\TEMP\SD624601A.cal

MCE325 specifications

The Telex MCE325 is a sophisticated communications headset designed primarily for professionals who demand clarity and reliability in their audio equipment. Renowned for its advanced features and high-quality construction, the MCE325 is a popular choice in various fields, including aviation, broadcast, and live event production.

One of the standout features of the Telex MCE325 is its superior noise-cancellation technology. This headset is engineered to effectively reduce ambient noise, allowing users to focus on important audio signals without distractions. The exceptional passive noise isolation works in tandem with the active noise-cancelling capabilities to ensure that you can communicate clearly, even in loud environments.

The MCE325 also incorporates a high-performance microphone that delivers crystal-clear sound transmission. The flexible boom design allows users to position the microphone for optimal voice pickup, making it suitable for both left- and right-handed users. The microphone’s windscreen further minimizes wind noise, providing an extra layer of clarity during outdoor use.

Comfort is a critical aspect of the MCE325. The headset features plush, padded ear cups that provide excellent comfort for extended use. The adjustable headband ensures a secure fit, catering to a wide range of head sizes and shapes. This ergonomic design minimizes fatigue, allowing users to maintain focus during long hours of operation.

Connectivity is another area where the Telex MCE325 excels. It is versatile enough to work with various devices, thanks to its dual 1/4” and XLR connectors. This flexibility makes it compatible with many audio interfaces and communication systems used in professional settings. The headset also includes a detachable cable, allowing for easy replacement if needed.

The construction of the Telex MCE325 reflects a commitment to durability and longevity. Built with high-quality materials, the headset can withstand the rigors of demanding professional environments. This robustness ensures that users can trust the MCE325 in the most challenging situations, whether it’s in a busy studio or a bustling airport.

In summary, the Telex MCE325 is a versatile and reliable headset designed to meet the needs of professionals across various industries. With its cutting-edge noise-cancellation technology, high-quality microphone, comfort-focused design, versatile connectivity options, and durable construction, it stands out as an ideal choice for anyone seeking superior audio performance and reliability. Whether in communications, aviation, or live broadcasting, the MCE325 delivers an exceptional audio experience.
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