McIntosh XRT1K owner manual Introduction

Figure 1

Figure 2

Figure 3

Introduction

McIntosh Acoustic Engineers have further refined the con- cept of line source column in the XRT1K Loudspeaker to provide superior sound reproduction in a full range system. It uses the same acoustic technology found in the famous XRT2K Column Loudspeakers. The technology has been refined over the years and is now the 6th generation of the design and provides superior

quality sound reproduction in a full range system.

The High Frequency Sec- tion utilizes a patented Column Design1 with multiple three- quarter inch Titanium Dome Tweeters and two inch Midrange Inverted Titanium Dome Driv- ers. Refer to figures 1 and 2. Since the audio power fed

to a column is distributed among all the drivers, each driver does not have to work as hard, resulting in greater power handling capability and a dramatic reduction in distortion. The Sound Waves from the Column produce a Cylindrical Wave Front with a stable symmet- rical horizontal

sound disper- sion to minimize undesirable floor and ceiling reflections that could detract from a stable sound image. In

the illustration the Loudspeaker on the left side produces a Cylindrical Wave Front and the Loudspeaker on the right side produces a conventional Spherical Wave Front. Refer to figure 3.

The Low Frequency Section of the System consists of two 10 inch Woofers. They have a large magnet assembly and long cone excursions with very low levels of harmonic distortion and frequency response down to 16Hz. Refer to figure 4. The Woofer also incorporates McIntosh’s Pat- ented LD/HP2 Magnetic Circuit Design. Finite Element Analysis and testing resulted in a design concept which utilizes a pair of aluminum shorting sleeves in the magnet- ic circuit. Refer to figure 5. The sleeves virtually elimi-

1COLUMN Pat. No. 4,267,405 2LD/HP Pat. No 5,151,943

nate the negative
influence of the
fluctuating voice
coil field on the
permanent magnet
field. This results
in lower distor-
tion due to more
linear magnetic
flux in the voice
coil gap. Refer to
figure 6. Ad-
ditional 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
	Figure 4
listening, reveal
ten times less distortion than
	LD/HP
previous designs. A good
example of this low distortion	Conventional
is incredible smoothness and
clarity in the reproduction of
the human voice.
The Crossover Network
used in the XRT1K Loud-
speaker System is designed
	Figure 5
to ensure an even frequency
response over
the entire au-
dible range. The
Network utilizes
both Second
and Third Order
design utilizing
Capacitors and
Inductors with
high current
	Figure 6
capacity. Refer

to figures 7, 8 and 9. There are two different types of low loss (DCR) Inductors in the network, each one chosen not to exhibit any core saturation even at high power levels.

This prevents the addition of distortion to the music at any frequency. The Capacitors used include low loss (ESR) Polypropylene and Mylar types. The Network also utilizes

4