General Product Description

The Electro-Voice®309 series loudspeaker systems are two-way loudspeakers with 8-inch low-frequency cones and high temperature voice-coil assemblies coaxially mounted with wide-dispersion cone tweeters. The dual magnet construction allows each speaker to be structurally, magnetically, electrically and mechanically independent of the other. The 309-8A/309-4T/309-8T utilize a single section crossover network, centered at 3,000 Hz, which provides 6 dB of attenuation for the tweeter outside its operating range. The 309-4T is provided with a 25/70.7/ 100-V line transformer that offers <1 dB insertion loss and a selection of 0.5-, 1-, 2- and 4-W taps.

The 309-8T is features a 70.7/100-V line transformer that offers <1 dB insertion loss and a selection of 1-, 2-, 4- and 8-W taps.

These components are designed to work together as a complete system of in-ceiling loudspeakers and accessories. They provide wide dispersion, high-efficiency, high- maximum output, ease of installation and wide-range reproduction of music or voice.

WB versions come complete with a pre-mounted ceiling grille.

Architects’ and Engineers’ Specifications

The loudspeaker shall have an 8-inch low-frequency cone radiator and a coaxially mounted, wide-dispersion cone tweeter. The loudspeaker shall meet the following criteria: AES power rating shall be 16 watts of band-limited pink noise (85 Hz to 18 kHz, 6 dB crest factor). Frequency response will be uniform from 85 Hz to 18 kHz on both the transformer and non-transformer versions. Pressure sensitivity, 96 dB SPL at 1 meter (94 dB at 4 feet) on axis with one watt of band-limited pink noise from 500 Hz to 3 kHz (ref. 20 mPa). Minimum impedance, 6.0 ohms.

309 Series

8-inch Ceiling

Loudspeakers

COMMERCIAL

The loudspeaker shall be 206.5 mm (8.13 in.) in diameter and

82.5mm (3.25 in.) deep. Weight shall be 1.3 kg (2.8 lb) [309-8A],

1.4kg (3.1 lb) [309-4T] and 1.45 kg (3.2 lb) [309-8T]. The 309-4T shall have a 70-V transformer with taps at 0.5, 1, 2 and 4 watts. The 309-8T shall have a 70-V transformer with taps at 1, 2, 4 and 8 watts. The maximum insertion loss shall be < 1.0 dB. The loudspeakers shall be the EV (Electro-Voice®) 309SA; and 309-4T and 3098T with transformer.

Specifications:

Pressure Sensitivity:

96 dB SPL

(1 W, 500 Hz - 3 kHz) re: 20 µPa

 

Frequency Response:

85 Hz - 18 kHz (see Fig. 1)

Power-Handling Capacity:

16 watts

85 - 18 kHz, bandlimited pink noise, 6 dB crest factor

Impedance:

 

Nominal:

8 ohms

Minimum:

6 ohms (11 kHz)

Maximum Long-Term Output:

108 dB SPL

(16 W/1 m) re: 20 mPa)

 

Crossover Network:

3,000 Hz

with 6 dB-per-octave tweeter protection

 

Input Terminals:

.212-in. push terminals

309-8A - Theile-Small Parameters

 

Free Air Resonance, fs:

110 Hz

Equivalent Volume Compliance,V :

0.92 ft3

AS

 

Total Q, QTS:

0.94

Electrical Q, QES:

1.16

Mechanical Q, QMS:

5.03

Volume Displacement V :

1.61 in.3

D

 

Reference Efficiency:

2.87%

Speaker Frame:

22-gauge stamped steel

Finish:

Black

Dimensions:

 

309-8A / 309-4T

 

Loudspeaker Diameter:

206.5 mm (8.13 in.)

Height:

82.6 mm (3.25 in.)

Net Weight:

 

309-8A:

1.3 kg (2.8 lb)

309-4T:

1.9 kg (4.1 lb)

309-8TWB:

2.3 kg (5.0 lb)

Shipping Weight:

 

309-8A:

1.5 kg (3.3 lb)

309-4T:

2.1 kg (4.6 lb)

309-8TWB:

2.5 kg (5.5 lb)

Transformer Input:

 

309-4T

25/70.7 (100 volt operation)

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Telex 309 series specifications Inch Ceiling Loudspeakers, General Product Description, Specifications

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.