Altec Lansing 405-8H - Manual

405-8H and 405-8HT
LOUDSPEAKERS
SPECIFICATIONS
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.
Power Rating: 15 watts continuous pink
noise (above 50 Hz)
Frequency Response:60-15,000 Hz
Pressure Sensitivity: 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')
Impedance: 8 ohms
25/70 Volt Taps: 4, 2,1,0.5 watts
(Model 405-8HT only)
Insertion Loss:
Transformer
Frequency
1.0 dB max. (405-8HT only)
Response:
Nominal Free-Air
±1 dB, 100-10,000 Hz
(Model 405-8HT only)
Cone Resonance:
Nominal Distribution
120 Hz
Pattern:
Distribution Pattern
With Polar to
90°
Planer Correction: 107° at 2 kHz
69° at 4 kHz
Voice Coil Diameter:
Magnet Structure— 1"
Magnet Type: Ceramic (V)
Magnet Weight: 1% pounds
Flux Density:
Construction—
10,250 gauss
Frame (Basket): Structurally reinforced
die-cast aluminum
Cone: Molded fiber
Cone Suspension: High-compliance foam
surround
Voice Coil:
Voice Coil Support Copper
Material: Kapton®**
Cone Excursion:
Terminals— 0.125" max. peak to peak
Speaker: 0.205" (0.52 cm) spade
lug type
Transformer:
Mounting Data—
Pigtails
Baffle Opening:
Mounting Bolt
3.812" (9.68 cm) diameter
(rear mounted)
4.125" (10.48 cm) diameter
(front mounted)
Centers: 4 equally spaced slots 90°
apart on 4.75" (12.07 cm)
diameter circle
Dimensions— 5.132" (13.49 cm) diameter
Model 405-8H: 2.125" (5.40 cm) depth
Model 405-8HT:
Weight—
4.063" (10.32 cm) depth
Model 405-8H: 2 lbs. 1 oz. (0.94 kg)
Model 405-8HT: 2 lbs. 9 oz. (1.2 kg)
Color: ALTEC black
*See Technical Letter No. 257, "Sound Distribution
on a Plane Normal to a Loudspeaker Axis."
*Kapton® is a registered trademark of DuPont.