Altec Lansing 938-8AE User Manual

938-8AD/938-8AE

LOUDSPEAKER SYSTEM

DESCRIPTION

The Altec Lansing 938 multi-purpose loudspeaker
systems are both compact and versatile. They

were designed to be used as high level stage

monitors in portable sound reinforcement and
can also be used as a small, full range system in
churches or night clubs or for reinforcement

installation in any small to medium room.

The 938 may be placed at 90®, 50° or 30° angles
(referenced to floor-plane mounting surface). The

reversible grille permits a right-side-up orientation

regardless of the speaker's position. The 938 uses
an upgraded version of the Altec Lansing 604,

long recognized for uniform frequency response
and high efficiency, with low and high frequency
elements mounted coaxially to produce a single
point source of sound. New materials have been

used in the low and high frequency voice coils

which allow the 938 to handle large power amp

lifier outputs. The dividing network is designed
with 12 dB per octave slopes for a smooth and
gradual transition at crossover and has adjustable
attenuation at high frequencies.

The enclosure is constructed of Va" birch plywood
and is finished in a black texture surface poly

urethane paint with a black grille. The 938 also
features recessed carrying handles and durable
metal corner guards to protect the cabinet during
handling and set-up. In addition, convenient tee
nut mounting points are provided to aid in hanging
the system in a permanent installation.

When used as a monitor or a small main system,
the 938 will supply the high level quality sound
that is required for churches, hotels and other

installations.

SPECIFICATIONS
System Type:

Pressure Sensitivity:

Frequency Response:
Power Handling:

Maximum Long Term
Output:

Impedance:

Distribution Pattern:

Components:

Crossover Network:

Two way, vented, full range loudspeaker
system

100 dB SPL (1W, 1M, 80 Hz-15 kHz,
re: 20pPa, see Note 2)

80 Hz-15 kHz (see Figure 1, Note 3)
150 watts, 80 Hz-15 kHz, AES method

(see Note 4)
300 watts, 80 Hz -15 kHz continuous
program material (see Note 12)
600 watts peak power, 80 Hz-15 kHz (see
Note 13)

122 dB SPL (1M, re: 20pPa, see Note 5)
128 dB SPL peak

7.20 minimum, maximum inductive phase
angle = 68° at 8 Hz, maximum capacitive
phase angle = 59° at 20 Hz (see Figures
3 and 4, Note 11)

60° horizontally by 40° vertically (see
Figure 8)

16" coaxial loudspeaker, part number
50-03-026768

938-8AO part number 56-06-027683,
938-8AE part number 56-06-027506
Crossover frequency 2 kHz with choice of

Enclosure:

Input Connector:

Replacement H,F,
Diaphragm:

L,F, Recone Kit:
Replacement Grille:
Dimensions:

Net Weight:
Shipping Weight:
Finish:

high frequency attentuation.
Vented type for optimum response, built

of Vi inch (1.9 cm) birch plywood lined
with glass wool, includes tee nut mounting
points on each side and a removable grille.

938-8AD; red and black five way binding
posts and two W phone jacks wired in
parallel.
938-8AE; red and black five way binding
posts and XLR connectors wired in parallel
(Pin 2 is positive and Pin 3 is negative).

Model 26420

R604-8L
Model RC 938

20.5" (52.1 cm) high
22" (55.8 cm) wide

21.5" (54.6 cm) deep
58 lbs. (26.4 kg)
60 lbs. (27.3 kg)
Black, texture finish, polyurethane paint,

black grille cloth

so 100 zoo 500 IK ZK

FREQUENCY (Hj)

Figure 1. Frequency Response (See Notes 1 and 3)

50 100 ZOO SOO IK ZK 5K 10K ZOK

FREQUENCY (Hi)

Figure 3. Magnitude of Impedance

SK I OK ZOK

FREQUENCY (Hz)

Figure 2. Phase Response (See Note 6)

20 SO 100 200 500 IK 2K

FREQUENCY (Hz)

Figure 5. Harmonic Distortion at .01 Rated Power

(1.5 watts, See Note 7)

SK 10K 20K

SO 100 200 500 IK 2K

Figure 6. Harmonic Distortion at 0.1 Rated Power

FREQUENCY (Hz)

(15 watts. See Note 7)

10K 20K