What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





McIntosh XL10 loudspeakers

The XL10 is a three way loudspeaker system with two active drives and one passive. It can accurately reproduce a three dimensional sound space with smooth response. The McIntosh anechoic chamber provided the ability to adjust response, amplitude and arrival time. As a result, the XL10 can recreate stereo sound for you with full depth and spaciousness.

The XL10 has a one inch dome tweeter, a carefully matched, high power handling eight inch woofer and a ten inch controlled mass passive radiator. It has an extensive and meticulously designed crossover network.

The eight inch woofer has a copper wire voice coil wound on a black anodized aluminum voice coil form. This form, radiates heat effectively. Excessive heat is always destructive to electronic circuit elements so this design feature is very important to the long life of the XL10. the windings are attached with a high temperature, thermal setting adhesive.

The voice coil assembly is joined directly to the rigid cone. It moves in the magnetic field of a critically sized magnet and magnet structure. This assembly is cantered 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 to ideally match the energy capability of the magnetic structure. The total of the cone, voice coil, and suspension assembly is attached to the speaker basket with a critically formed, closed cell urethane surround.

The inch passive radiator has an accurately adjusted moving mass and compliance which complements the design characteristics of the eight inch woofer and the volume of air in the Xl10 enclosure. In the lower bass frequency range, this rigid cone is driven in phase, acoustically, by the woofer, extending the system acoustic output. The cone assembly is attached to the speaker basket by a special cloth spider and a closed cell surround.

The one inch high frequency dome tweeter is made of a specially formulated textile which is driven by a copper wire voice coil wound on a high temperature voice coil 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.

The frequency directing crossover network directs all musical information below a designed frequency to the woofer and all frequencies above to the dome tweeter. The McIntosh crossover network, however, has additional tasks to perform. It must smooth the response in the active area of sound. A loudspeaker that can deliver ideal depth, spaciousness and three dimensional sound space, requires a crossover network that is a product of particular and comprehensive examination of the multitude of mathematical potentials to include the exact circuit components in order to provide smoothest response and correct arrival time. Exhaustive measurements in the McIntosh Full Sized Anechoic Chamber assures the exactness of the circuit and of the components selected for the crossover.

 


Specifications

Frequency Response:  45 Hz - 20,000 Hz

Max. Power:  the XL10 can be driven with peaks up to 200 watts but the high frequency fuse may occasionally blow.

Woofer :  100 watts program noise

Tweeter :  60 watts program noise

Minimum Power:  As little as 30 watts can be used for smaller rooms and lower listening levels. An adequate power reserve is recommended, however, to handle occasional peaks. Most damage to speaker system is from underpowered amplifiers driven into clipping. McIntosh amplifiers equipped with Power Guard automatically prevent clipping.

Impedance:  8  nominal

Fuse protection:  the tweeter is protected by an 0,6 amp fast acting fuse. Replace only with the same type and rating. Do not use Slo-Blo fuses.

Reference Output Level:  89 dB at 1 m and 1 watt input

Crossover Frequencies:  90 Hz and 1 kHz

Speaker Sizes

1 x 254 mm (10") lower bass PR

1 x 203 mm (8") bass driver

1 x 25,4 mm (1 ") dome tweeter

Construction:  19 mm (3/4") high density particle board with airtight glueing and internal bracing

Dimensions (H x W x D):  632 x 361 x 201 mm (24-15/16" x 14-3/16" x 7-13/16")

System Weight:  12,5 kg (27,5 lbs)


 

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