ARCHITECTS & ENGINEERS SPECIFICATION
The loudspeaker shall be an Altec Lansing Professional CD308
series Duplex® with an 8 inch (200 mm) diameter moisture-
resistant woofer and broad dispersion tweeter with heat
resistant voice-coils. The speaker shall have a power rating
of 16 W EIA / 64 W peak, a double magnet assembly and
corrosion-resistant frame. The frequency response shall be 78
to 20,000 Hz +/- 5 dB with a sensitivity of 97 dB @ 1 W 1 m.
All transformers shall have a low < 0.6 dB insertion loss. The
model numbers shall be Altec Lansing Professional CD308-8A
for 8 Ohms impedance, CD308-4T with a 4 Watt 70 V/100 V
transformer, CD308-8T with an 8 Watt 70 V/100 V transformer,
and a CD308-16T with a 16 Watt 70 V/100 V transformer.
ENCLOSURES AND BAFFLES
The CD308-series ceiling speakers will fit on standard
8 inch (200 mm) baffles, enclosures and back boxes.
All measurements were made in a standard AES baffle
for a 12 inch driver. The driver was housed in a 1.0 ft
3
(0.028 m
3
) enclosure.
Please note that larger volume enclosures will result
in altered low frequency performance.
SAFETY CONSIDERATION
1. Appropriate connectors with suitable ratings must be used
to make all installation connections.
2. All unused taps must be insulated with suitable insulation.
3. Transformers and speaker combinations must be supplied
by a suitable amplifier incorporating ungrounded outputs
only and reinforced insulation (as per IEC60065) from output
to mains.
SORIES
ACCESSORIES
Altec Lansing recommends use of our 8 inch (200 mm) round and
square metal enclosures, grilles and tile bridge. The CD308 Series
will also fit on standard industry ceiling speaker hardware.
MOUNTING DIMENSIONS
Frequency Response (1 W 1 m on-axis)
Impedance
Q & Directivity Index
Beamwidth
A
B
A
B
CD308-8A
8.07 in (205 mm)
3.11 in (79 mm)
CD308-4T
8.07 in (205 mm)
3.68 in (94 mm)
CD308-8T
8.07 in (205 mm)
3.68 in (94 mm)
CD308-16T
8.07 in (205 mm)
4.11 in (105 mm)
