Altec Lansing CD308-8A, CD308-8T, CD308-16T, CD308-4T User Manual

CD308-8A
CD308-4T
CD308-8T

CD308-16T

8” Ceiling Speakers

SPECIFICATIONS

Frequency Response

78 – 20,000 Hz +/- 5 dB

Low frequency limit (-10 dB)

63 Hz

Power Handling

16 W EIA, 64 W peak

Sensitivity (SPL - 1 W 1 m)

97 dB

Maximum Output (Peak SPL)

115 dB

Magnet Weight

0.63 lb (0.29 Kg)

Impedance

Nominal - 8 Ohms
Minimal - 7.3 Ohms

Crossover

3,000 Hz

DIMENSIONS

CD308-8A

Height: 3.11 in (79.6 mm)
Diameter: 8.07 in (205 mm)

CD308-4T

Height: 3.68 in (94.1 mm)
Diameter: 8.07 in (205 mm)

NET WEIGHT

CD308-8A

2 lbs 7 oz (1.1 kg)

CD308-4T

3 lbs 13 oz (1.7 kg)

SHIPPING WEIGHT

CD308-8A

2 lbs 6 oz (1.4 kg)

CD308-4T

4 lbs 9 oz (2.1 kg)

TRANSFORMER

CD308-4T

4 W 70 V/100 V transformer
with 70 V taps @ 4 W, 2 W, 1 W and 0.5 W

CD308-8T

8 W 70 V/100 V transformer
with 70 V taps @ 8W, 4W, 2W and 1.0W

CD308-16T

16 W 70 V/100 V transformer
with 70 V taps @ 16W, 8W, 4W and 2.0W

FEATURES – THE ALTEC LANSING DIFFERENCE

• Premium 8 inch / 200 mm Duplex

®

design

• Point-source design maximizes speech intelligibility

• 16 W EIA / 64 W peak power handling

• Available with three factory-mounted 70 V / 100 V
transformers

• All transformers have a low < .6dB insertion loss

• Corrosion resistant speaker frame

• Special moisture resistant speaker cone

CD308 Series

GENERAL PRODUCT DESCRIPTION

The Altec Lansing Professional CD308 series is a premium-grade
Duplex

®

component designed to faithfully reproduce music
program and the human voice. The CD308 family is an excellent
choice for meeting spaces, under-balcony applications, A/V
presentation facilities, shops & restaurants and other high quality
general paging applications. The loudspeaker consists of an
8 inch / 200 mm special moisture resistant cone woofer and
broad dispersion cone tweeter with heat resistant voice coils.
The speaker frame has been treated for rust prevention. A 3,000
Hz first-order crossover provides smooth high frequency
transitions. The double magnet design allows physical, electrical,
and magnetic isolation. The optional 70 V/100 V transformers (4,
8, and 16 Watts) feature a low < 0.6 dB insertion loss.

CD308-8T

Height: 3.68 in (94.1 mm)
Diameter: 8.07 in (205 mm)

CD308-16T

Height: 4.11 in (104.1 mm)
Diameter: 8.07 in (205 mm)

CD308-8T

4 lbs 1 oz (1.8 kg)

CD308-16T

4 lbs 10 oz (2.1 kg)

CD308-8T

4 lbs 13 oz (2.2 kg)

CD308-16T

5 lbs 7 oz (2.5 kg)

P ROFESSIONAl

1000 W. Wilshire Blvd., Suite 362 • Oklahoma City, Oklahoma 73116 • Phone: [phone] • Fax: [phone] • www.altecpro.com

ARCHITECTS & ENGINEERS SPECIFICATION

The loudspeaker shall be an Altec Lansing Professional CD308
series Duplex®with an 8 inch (200 mm) diameter moisture­resistant 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 m3) 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

AB

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)