309 Series
8-inch Ceiling
Loudspeakers
COMMERCIAL
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.
The loudspeaker shall be 206.5 mm (8.13 in.) in diameter and
82.5 mm (3.25 in.) deep. Weight shall be 1.3 kg (2.8 lb) [309-8A],
1.4 kg (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.
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, f
s
:
.............................................................. 110 Hz
Equivalent Volume Compliance,V
AS
:
......................................... 0.92 ft
3
Total Q, Q
TS
:
..................................................................................... 0.94
Electrical Q, Q
ES
:
............................................................................. 1.16
Mechanical Q, Q
MS
:
........................................................................ 5.03
Volume Displacement V
D
:
.................................................... 1.61 in.
3
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)
Specifications:
