Recommended Connections

The 309 is a nominal 8-ohm impedance loudspeaker with a 10-watt input capability. However, it is also available with transformer, the 309-4T, and with transformer and grille, the 309-4TWB.

The 309-4T utilizes a 4-watt, 25/70.7/100-volt universal line matching transformer with power taps ranging from 0.5 to 4 watts as indicated in the table for the 309-4T. The transformer is mounted to the frame and the primary winding is accessible for the user to select any of the power taps indicated in the table for the 309-4T.

All wattages marked for the various taps refer to the load on the amplifier, with the insertion loss of the transformer being less than 2 dB.

Recommended Enclosures and Baffles

309-8A and 309-4T are designed to fit on standard 8-inch ceiling speaker baffles. Additionally, the 209 series loudspeakers will accommodate the use of any standard back enclosure with a diameter of 8.6 inches or greater and a depth of at least 3.5 inches.

Larger back volumes will increase the lowfrequency output. The frequency response of a 209 in a typical 0.25-cubic-foot and 1.8-cubic-foot back enclosure are shown in Figure 1.

Mounting

The 309 may be front- or rear-mounted against either surface of its mounting flange and requires a 18.4 cm (7.25 in.) diameter cutout and a 19.5 cm (7.68 in.) bolt circle. Normal fasteners up to 5 mm (0.20 in.) will fit through the eight holes in the frame. The 309 is designed for mounting on standard ceiling speaker baffles.

Figure 1, One-Third-Octave Polar Response Charts

Measurements were made in a 1.5 ft3 closed enclosure.

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Telex 309 series specifications Recommended Connections, Recommended Enclosures and Baffles, Mounting

309 series specifications

The Telex 309 series represents a hallmark of innovation in the realm of two-way communication systems. This product line, introduced by Telex Communications, is designed to facilitate seamless communication, particularly in environments where clear audio is crucial, such as broadcasting, production, and live events.

One of the main features of the Telex 309 series is its robust durability. The devices are engineered to withstand the rigors of professional use, ensuring longevity and reliability. Their rugged construction is complemented by an ergonomic design that enhances user comfort, especially during extended periods of use.

A standout characteristic of the Telex 309 series is its advanced audio technology. Each unit employs state-of-the-art microphone and speaker systems designed to deliver crystal-clear audio. This technology minimizes background noise and ensures intelligibility, making it ideal for communication in high-noise environments. Enhanced frequency response contributes to a natural sound profile, making conversations feel more personal and engaging.

The series is equipped with multi-channel capabilities, allowing users to switch between different communication lines effortlessly. This is particularly beneficial in dynamic settings where multiple teams or departments need to coordinate simultaneously. With a wide range of channels available, users can easily adapt to various communication needs without the interference often found in simpler systems.

Another notable feature of the Telex 309 series is its wireless technology. These devices utilize advanced signal transmission protocols, providing a stable and secure connection over considerable distances. This wireless capability eliminates the constraints of cables, thereby enhancing mobility and ease of use. Users can move freely within a designated area while maintaining clear communication, which is a significant advantage in large venues or outdoor settings.

The series also prioritizes user-friendly interfaces. Intuitive controls and indicators make it easy for users to operate the devices efficiently, reducing the learning curve for new users. This focus on usability ensures that personnel can concentrate on their tasks rather than wrestling with complex technology.

In summary, the Telex 309 series stands out for its durability, advanced audio technology, multi-channel capabilities, wireless functionality, and user-friendly design. These characteristics combine to create a powerful communication tool that meets the demanding needs of professionals in various industries, making the Telex 309 series an essential component of effective communication solutions.