Electrical Installation

AC Power and Fuse

The Model MCE325 is pre-wired for either 115 or 230 VAC operation, and the appropriate fuse is already installed. The MCE325 uses a 0.5A Slo-Blo fuse for 115 volt operation, or a 0.25A Slo- Blo fuse for 230 volt operation. (A fused external DC source may be used instead of AC power if desired. (See “External DC Power Source”.)

Intercom Lines J8, J9, and J10

General

Intercom line connectors J8 and J9 are parallel-wired for loop-through connection to other intercom stations. These connectors are used for connection of two-wire lines to channels one and two (full-duplex operation), or for connection of four-wire channel A output (channel A input is connected at the auxiliary connector).

Intercom line connector J10 is used for connection of two-wire lines to channels three and four (full-duplex operation), or for connection of four-wire channel B output (channel B input is connected at the auxiliary connector).

Connector Pin-outs

Table 2.4 Connectors J8 and J9.

PIN # FUNCTION

1Common (low side of line)

2Two-wire CH 1 or four-wire CH A high output

3Two-wire CH 2 or four-wire CH A low output

Table 2.5 Connection J10

PIN # FUNCTION

1Common (low side of line)

2Two-wire CH 3 or four-wire CH B high output

3Two-wire CH 4 or four-wire CH B low output

Four-wire Output Termination

Figure 2.4 4-wire output terminations.

When four-wire outputs are used, termination resistors must be installed for proper operation. The output amplifiers are current sources, and the output level is determined by the terminating

2-8C S I - 2 0 0 U s e r I n s t r u c t i o n s

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Telex MCE325 manual Electrical Installation, AC Power and Fuse, Intercom Lines J8, J9, and J10
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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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