Architect's and engineer's specifications, L-aisisiisig, Aijteic – Altec Lansing 291-8L User Manual
Page 2
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ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The
compression
driver
loudspeaker
shall
meet
the
following
criteria.
Power
capacity:
50
watts
average
pink
noise,
band-limited
from
500-20,000 Hz and measured with Altec 300 or
500 Hz horn. Frequency response, uniform from
500 to13,000 Hz. Pressure sensitivity shall be109
dB-SPL (re: 20(jLPa), with 1 W of pink noise band-
limited
500
Hz-16
kHz,
at
1
M
from
lips
of
MR11594A
horn.
Minimum
impedance:
8
ohms
(291-8L), 16 ohms (291-16L). The voice coil shall be
2.8"
in
diameter,
of
edge-wound
aluminum
ribbon, and shall operate in a magnetic gap hav
ing
a
flux
density
of
2.05
T derived from
a
6.87-pound Ferrite V magnet. The diaphragm shall
be an aluminum dome and shall have Kapton®
suspension. A Tangerine® phasing plug with 13
radial acoustic slots shall serve as the pole piece
and shall also be utilized to provide the proper
phase
relationship
between
the
sound
emanating
from the center and edges of the diaphragm and
voice
coil
assembly.
The
entire
diaphragm
and
voice
coil
assembly
shall
be
field
replaceable
without
requiring
special
tools
or
skills;
ad
justable dowel pins shall allow each voice coil to
be precisely centered in the voice coil gap. The
drive shall be 7.61" in diameter by 5.8" deep (ex
cluding
1"
depth
of
mounting studs),
and shall
weigh 30.5 pounds.
The compression driver loudspeaker shall be the
Altec Model 291-8L or 291-16L.
AIJTEIC
L-AISISIISIG*
P.O. BOX 26105, OKLAHOMA CITY, OKLAHOMA 73126-0105, U.S.A.
© 1987 ALTEC LANSING CORPORATION
PRINTED IN U S A. 1087-3.5M
REVISION 5
AL-2297
42-07-027070