Owner's Manual

4
McIntosh Acoustic Engineers have achieved in the
design of the LCR80 Loudspeaker System, a level
of high performance. The LCR80 provides superior
spaciousness sound reproduction with unusual sound
stage depth.
The LCR80 utilizes a three-quarter
inch Titanium Dome Tweeter and a pair
of two inch Midrange Inverted Titanium
Dome Drivers. Refer to figures A and
B. Since the audio power is distributed
among all the drivers, each driver
does not have to work as hard,
resulting in greater power handling
capability, dramatic reduction in
distortion and greater dynamic
range.
The Low Frequency Section
of the System consists of a newly
designed six inch Woofer. Refer to figure C.
The two Woofers incorporate McIntosh’s Patented
LD/HP
® 1
Magnetic Circuit Design. Finite Element
crossover network. The type of Inductor used in each
section of the crossover network has been chosen for
high linearity, even at high power levels. This prevents
distortion of the music at any frequency. The Capaci-
tors used are the low loss (ESR) types. The Network
also utilizes self resetting high current PTC Fuses to
provide an extra measure of protection.
The enclosure is an important part of the LCR80
Loudspeaker System. The Loudspeaker’s small foot-
print allows for a variety of different placements in a
room.
Introduction
Analysis and testing resulted in a design concept
which utilizes a pair of aluminum shorting sleeves
in the magnetic circuit.
Refer to figure D. The
sleeves greatly reduce
the negative influence of
the fluctuating voice coil
field on the permanent
magnet field. This results
in lower distortion due
to more linear magnetic
flux in the voice coil gap.
Refer to
figure E.
Additional
benefits are
less volume
compres-
sion due to
improved
heat trans-
fer through
the sleeves
and a cooler
operating voice coil. Both measurements, as well as
critical listening, reveal ten times less distortion than
previous designs. A good example of this low distor-
tion is incredible smoothness and clarity in the repro-
duction of the human voice.
The Crossover Network used in the LCR80 Loud-
speaker System is designed to ensure an even frequen-
cy response over the entire audible range. The Second
Order Designed Network utilizes Capacitors and
Inductors with high current capacity. Refer to figure
F. The LCR80 uses low loss (DCR) Inductors in the
Figure A
Figure B
Figure C
Figure E
Figure D
LD/HP
Conventional
1
LD/HP Pat. No 5,151,943
Figure F