Altec Lansing 418-8H User Manual
Page 3
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
о
О-
со
+104
+94
+84
+74
+64
10
20
50
100
200
500
1000
2000
5000
10000
20000
FREQUENCY IN HZ
Figure 1. 418-8H Frequency Response Measured at 4' on Axis with 1 Watt Input
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The
musical
instrument
loudspeaker
shall
have
a
maximum
diameter
of
15-5/16"
and shall weigh 14 pounds, 6 ounces. It shall have a structurally reinforced die-cast
aluminum frame which shall be rigid enough to permit front or rear mounting. The
voice coil shall be 3" in diameter, of edge-wound copper ribbon, and shall operate
in a magnetic gap having a flux density of 13,000 gauss. The loudspeaker shall have
an Alnico V permanent magnet weighing not less than 2.4 pounds. The magnetic
structure shall have a metal dust cover to protect it from dirt, iron particles and
magnetic
dust.
The
cone-surround
area
shall
be
of
high-compliance
cloth.
The
musical
instrument
loudspeaker
shall
meet
the
following
performance
criteria.
Power
rating,
up
to
150
watts
of
continuous
program
material.
Frequency
response,
uni
form from 45 to 8000 Hz. Pressure sensitivity; 99 dB SPL with 1 watt input of
band-limited pink noise from 100 Hz to 10 kHz measured on axis 4' from cone, 98
dB SPL with 1 watt input of band-limited pink noise from 100 to 1000 Hz measured
on axis 4' from cone (Ref.: 0.0002 dyne/cm^). Equivalent El A rating, 52 dB SPL
measured
on
axis
30'
from
cone
with
1
milliwatt
input.
Nominal
impedance,
8
ohms. Nominal free-air cone resonance, 55 Hz.
The musical instrument loudspeaker shall be the ALTEC Model 418-8H.