Telex 309 series specifications inchCeiling Loudspeakers, General Product Description, Series

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)