Introduction - McIntosh XR200 Owner's Manual

Introduction

McIntosh Acoustic Engineers have achieved in the de-
sign of the XR200 Loudspeaker System a level of high
performance. The XR200 provides superior spaciousness
sound reproduction with unusual sound stage depth in a
full range system. It uses a new acoustic design technology
know as Progressive Inductance Control
permits the use of multiple Mid-
range and Tweeter Loudspeaker
Drivers to increase the Dynamic
Range of the Loudspeaker Sys-
tem, without the otherwise nega-
tive Acoustic Combing Effects
present in such a point source
Loudspeaker design.
The XR200 utilizes multiple
three-quarter inch Titanium
Dome Tweeters and 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, dra-
matic reduction in distor-
tion and greater dynamic
range.
The Low Frequency Section of the System consists
of three newly designed eight inch Woofers. They have a
large magnet assembly and long cone excursions with very
low levels of harmonic distortion and frequency response
down to 20Hz. Refer to figure 3.
LD/HP Pat. No 5,151,943
1
4
(PIC). PIC
TM
Figure 1
Figure 2
Figure 3
The three Woofers incorporate McIntosh's Patented LD/
HP Magnetic Circuit Design. Finite Element Analysis
® 1
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
TM
influence of the fluctuating
voice coil field on the perma-
nent magnet field. This results
in lower distortion due to more
linear magnetic flux in the
voice coil gap. Refer to figure
5. Additional benefits are less
volume compression due to
improved heat
transfer 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 distortion is incredible smoothness and clarity
in the reproduction of the human voice.
The Crossover Network used in the XR200 Loud-
speaker System is designed to ensure an even frequency
response over the entire audible range. The Third Order
Designed Network utilizes Capacitors and Inductors with
high current capacity. Refer to figures 6, 7 and 8. There
are two different types of low loss (DCR) Inductors in the
network, each one chosen not to exhibit any core satura-
tion even at high power levels. This prevents the addition
of distortion to 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 XR200 Loud-
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.
LD/HP
Conventional
Figure 4
Figure 5