McIntosh XR100 Owner's Manual page 4

Introduction
McIntosh Acoustic Engineers have achieved in the
design of the XR100 Loudspeaker System, a level
of high performance. The XR100 provides superior
spaciousness sound reproduction with unusual sound
stage depth in a full range system.
The XR100 utilizes a three-quarter
inch Titanium Dome Tweeter and 10 two
inch Midrange Inverted Titanium Dome
Drivers. Refer to figures 1 and 2. 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 3.
Figure 3
The four Woofers incorporate McIntosh's Patented
LD/HP Magnetic Circuit Design. Finite Element
® 1
LD/HP Pat. No 5,151,943
1
4
Analysis and testing resulted in a design concept
which utilizes a pair of aluminum shorting sleeves
in the magnetic circuit.
Refer to figure 4. The
sleeves greatly reduce
the negative influence of
the fluctuating voice coil
field on the permanent
magnet field. This results
Figure 1
in lower distortion due
to more linear magnetic
flux in the voice coil
gap. Refer
to figure 5.
Additional
benefits are
Figure 2
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 XR100 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
6. The XR100 uses low loss (DCR) Inductors in the
crossover network.
The type of Inductor
used in each sec-
LD/HP
tion of the crossover
network has been
Conventional
chosen for high lin-
earity, even at high
power levels. This
prevents distor-
tion of the music at
any frequency. The
Figure 4
Capacitors used are
the low loss (ESR)
types. The Net-
work also utilizes
self resetting high
current PTC Fuses
to provide an extra
measure of protec-
tion.
The enclosure is
an important part of
the XR100 Loud-
Figure 5
speaker System. It
has multiple front
to back and side to
side internal braces
to form a dampened
rigid Loudspeaker
enclosure. The
Loudspeaker's small
footprint allows for a variety of different placements
in a room.
Figure 6