Altec Lansing 405-8H User Manual

DESCRIPTION

The Altec Lansing Model 405-8H and 405-8HT
loudspeakers are compact 4" speakers that
provide the utmost in performance obtainable
from speakers of this size. Clear, intelligible
speech and good music reproduction are en
sured because of the extended 60-15,000 Hz
range.

Loudspeaker impedance rating is 8 ohms. The
Model 405-8HT incorporates a 70-volt line trans
former for applications in distributed sound
systems.

These quality loudspeakers are designed for
continuous, trouble-free service. The frame and
housing of the magnetic structures are fabri
cated of heavy-gauge steel. The small size of the
speakers allows either front or rear mounting in
walls, partitions, ceilings, and into volumes as
low as 0.1 cubic feet.

405-8H and 405-8HT

LOUDSPEAKERS

SPECIFICATIONS
Power Rating:

Frequency Response:60-15,000 Hz
Pressure Sensitivity:

Impedance: 8 ohms
25/70 Volt Taps: 4, 2,1,0.5 watts

Insertion Loss:
Transformer

Frequency
Response:

Nominal Free-Air

Cone Resonance:

Nominal Distribution

Pattern:

Distribution Pattern

With Polar to
Planer Correction:

Voice Coil Diameter:
Magnet Structure—

Magnet Type:
Magnet Weight:
Flux Density:

Construction—

Frame (Basket):
Cone:

Cone Suspension:
Voice Coil:

Voice Coil Support

Material:

Cone Excursion:
Terminals—

Speaker:

Transformer:

Mounting Data—

Baffle Opening:

Mounting Bolt

Centers: 4 equally spaced slots 90°

Dimensions—

Model 405-8H:
Model 405-8HT:

Weight—

Model 405-8H:
Model 405-8HT:

Color:

*See Technical Letter No. 257, "Sound Distribution

on a Plane Normal to a Loudspeaker Axis."

*Kapton® is a registered trademark of DuPont.

15 watts continuous pink
noise (above 50 Hz)

91 dB SPL measured at 4'
on axis with 1 watt input of
pink noise, band-limited
from 500-3000 Hz (Ref.:
0 dB = 0.0002 dyne/cm')

(Model 405-8HT only)

1.0 dB max. (405-8HT only)

±1 dB, 100-10,000 Hz
(Model 405-8HT only)

120 Hz
90°

107° at 2 kHz
69° at 4 kHz
1"

Ceramic (V)
1% pounds
10,250 gauss

Structurally reinforced
die-cast aluminum

Molded fiber

High-compliance foam
surround
Copper

Kapton®**

0.125" max. peak to peak

0.205" (0.52 cm) spade
lug type
Pigtails

3.812" (9.68 cm) diameter
(rear mounted)

4.125" (10.48 cm) diameter
(front mounted)

apart on 4.75" (12.07 cm)
diameter circle

5.132" (13.49 cm) diameter

2.125" (5.40 cm) depth

4.063" (10.32 cm) depth
2 lbs. 1 oz. (0.94 kg)

2 lbs. 9 oz. (1.2 kg)
ALTEC black

MOUNTING DIMENSIONS
(A) LOUDSPEAKER DIAMETER:

(B) LOUDSPEAKER DEPTH:
(C) BAEELE OPENING DIAMETER

MODEL 405-8H

5.312” (13.49 cm)

2.125” (5.40 cm)

4.125” (10.48 cm)

(Eront Mounted)

(C) BAEELE OPENING DIAMETER

3.812" (9.68 cm) 3.812” (9.68 cm)

(Rear Mounted)
(D) BOLT CIRCLE DIAMETER:
(E) BOLT HOLE SLOTS:

4.75” (12.07 cm)

0.20” (0.52 cm) x

0.25” (0.64 cm)

ARCHITECT'S AND ENGINEER'S

SPECIFICATIONS

MODEL 405-8H
The loudspeaker shall meet the following perform

ance and structural criteria. Power rating, 15 watts.

Frequency response, uniform from 60-15,000 Hz.
Pressure sensitivity, 91 dB SPL when measured at 4'
on axis with 1 watt input of band-limited pink noise
from 500-3000 Hz (Ref.: 0 dB = 0.0002 dyne/cm^).
Impedance, 8 ohms. Nominal free-air cone reso
nance, 120 Hz. The voice coil shall have a diameter
of 1” and shall operate in a magnetic field of 10,250
gauss derived from a ceramic (V) magnet weighing
at least 1V4 pounds. The loudspeaker shall be able
to perform efficiently in a volume as low as 0.1
cubic feet. The loudspeaker frame shall be of solid,
welded steel construction. The speaker terminals
shall be of the spade lug type. Dimensions, 5.312”
diameter x 2.125" deep. Weight, 2 pounds, 1 ounce.

The loudspeaker shall be the Altec Lansing Model
405-8H.

ROW 1 (1:2)

405-8HT

MODEL 405-8HT

5.312” (13.49 cm)

4.063” (10.32 cm)

4.125" (10.48 cm)

LEAD COLOR

Black
Green
Yellow
Red
Brown

WATTS

Common

4W
2W
1W

1/2 W

4.75” (12.07 cm)

0.20” (0.52 cm) x

0.25" (0.64 cm)

MODEL 405-8HT
The loudspeaker shall meet the following perform

ance and structural criteria. Power rating, 15 watts.
Frequency response, uniform from 60-15,000 Hz.
Pressure sensitivity, 91 dB SPL when measured at 4'
on axis with 1 watt input of band-limited pink noise
from 500-3000 Hz (Ref.: 0 dB = 0.0002 dyne/cm').
Impedance, 8 ohms. Nominal free-air cone reso
nance, 120 Hz. The voice coil shall have a diameter of
1" and shall operate in a magnetic field of 10,250
gauss derived from a ceramic (V) magnet weighing
at least 1V4 pounds. The loudspeaker shall be able
to perform efficiently in a volume as low as 0.1 cubic
feet. The loudspeaker frame shall be of solid, welded
steel construction. The speaker terminals shall be of
the spade lug type. Dimensions, 5.312” diameter x
4%" deep. Weight, 2 pounds, 9 ounces.

A 70-volt line transformer shall be incorporated for
use in distributed systems, and shall have a frequency
response of ±1 dB from 100-10,000 Hz, with maxi

mum insertion loss of 1.0 dB and primary wattage

taps of 4, 2, 1 and 0.5 watts.
The loudspeaker shall be the Altec Lansing Model

405-8HT.

ROW 2 (2 : 6)

1250 NORTH RED CUM STREET, ANAHEIM, CALIFORNIA 92806

ALTEC CORPORATION

LITHO IN U.S.A. 1283-2.5M Revision 2 AL-2291