The McIntosh XRT 18
system produces sound uimages that are amazingly life-like. You'll hear stereo
images that have depth and space dimensions that are so realistic, so
satisfying that you will feel aware of the dramatic emotional intensity of your
first experience of live music.
When you first hear
the XRT 18's you will be amazed by five outstanding characteristics:
Transparency of
sound
Coherence of sound
imaging
Definition of
musical instruments
Musical balance
Musicality of
expression
Absence of typical
loudspeaker sound
The core of the
concept of the XRT 18 system involved not only the usual guidance from years of
experience and the intuitive vision of a new possibility, but in this case it
centered, as well, around a one and only choice from hundreds of possible
cones, suspensions, magnets, agnetic assemblies, crossover network components,
enclosure volume, stiffnes and geometry. that one critical choice is an
optimized interrelatedness which yields, via computer modeling, the extra
smoothness of the time and energy response fields which has eluded researchers
for decades.
This miracle of
sound recreation does not happen by accident. To reproduce the power, the
clarity, and the pure musical expression of a triple fortissimo it takes a lot
of individual speaker mechanisms. the XRT 18 distriubutes the power over 32 tweeters, two midranges and
two bass mechanisms. All of these must be coordinated in time and intensity to
achieve the uniformity of sound images, wide, deep, accurate, realistic and
satisfyimng. How we combined all of these radiators in the correct combination
of pairs of radiators, controls of energy and time is the story of the XRT 18
system.
The voice coil
assembly is joined directly to the rigid cone. It moves in the magnetic field
of an oversized magnet and magnet structure. This voice coil assembly is
centered and suspended in the magnetic field by a special cloth spider. The
compliance of the spider is controlled by the careful impregnation of the cloth
with phenolic resins. Diligent engineering decades of experience and continuous
testing determined the selection of the right mass of the cone assembly for the
ideal match of the energy capability of the magnetic structure. The cone and
voice coil assembly is attached to the speaker basket with the centering spider
and a critically formed closed cell urethane surround which is coated with a
proprietary sealant.
The six inch
mid-range was designed to complement the frequency range of both the twelve
inch woofer and the one inch dome tweeters. Construction is very similar to the
woofer except the mass and size of moving parts are greatly reduced to
accommodate the higher frequency range. The rear of the mid-range is
acoustically isolated from the woofer so that it cannot be driven by the back
pressure wave of the woofer.
The one inch high
frequency domes are made of a specially formulated textile. each dome is
attached to a copper wire voice coil wound on a high temperature form. The
assembly is centered and suspended in the magnetic field by a special surround.
Both dome and surround are coated with a
proprietary material to make an air tight seal. The surround is connected to an intermediate ring which is fastened to
the magnet assembly.
Specifications
Frequency
Response: 20 - 20,000 Hz
Reference Output
Level: 86 dB (SPL) 1m/1W
Maximum Power: 150 watts of contiuous power (the system is
capable of up to 500 watts program peaks)
Recommend
Power: As little as 30 watts may be used
for smaller rooms and lower listening levels.
Fuse
Protection: system is protected by a 3
amp fast acting main fuse. The tweeters are protected by a 1=1/4 amp fast
acting fuse.
Impedance: 8 ohms nominal
Crossover
Frequencies: 350 Hz and 1500 Hz
Speaker Sizes
(diameter):
Woofer : 305 mm (12 inch)
Mid-range : 152 mm (6 inch)
Tweeters : 25,4 mm ( 1 inch)
Cabinet Construction
The bass cabinet and
high frequency column frame are made of 48 pound density fiber board with
genuine walnut veneer exteriors. The finish
is a 23 step process including 6 hand applications of oil-sealer with intermediated hand sanding
and rubbing operations which enhances the full beauty of the walnut.
Cabinet Dimensions:
Bass Cabinet (W x H
x D): 445 x 691 x 298 mm (17-1/2 "
x 27-7/32" x 11-3/4")
Tweeter Column (W x
H x D): 267 x 1456 x 413 mm
(10-1/2" x 57-5/16" x 1-5/8")
System Weight:
Bass Cabinet : 28,6 kg (63 lbs)
Tweeter Columns
: 13,2 kg (29 lbs)
Total Stereo System
Shipping Weight: 98 kg (216 lbs)