Specifications

low frequency sound to the LEFT and RIGHT FRONT
speakers. A LARGE full range CENTER speaker requires
that the switch be placed in the LARGE position for full
response in LEFT, CENTER and RIGHT FRONT channels.
This switch is only active in CINEMA 1 (DOLBY PRO
LOGIC) and CINEMA 2 (THX).
The SUR CAL switch selects an AUTOmatic or
MANual mode for calibration of the surround system.
See SUR CAL push button explanation under Front Panel
Controls, page 5 & 6.
REMOTE CONTROL
Two "F" connectors are provided. One is for an AREA
A external sensor and one for the AREA B sensor.
Two 7 pin DIN connectors are provided for parallel
control of CD players or changers.
A 1/8 inch phone jack for HOME and each input
selection provides serial data outputs for control of other
equipment.
A 1/8 inch phone jack for POWER CONTROL of high
power McIntosh amplifiers is also provided.
SYSTEM EXPANSION
Buffered audio outputs and the necessary data lines
for system expansion are provided on a female 25 pin
subminiature "D" connector. One cable to a CR10
MULTI-ROOM CONTROLLER is the only connection
required.
AC POWER
One switched AC outlet is provided for program
source equipment. A second and third are for the AREA
A and AREA B Power Amplifiers.
EXTERNAL ANTENNAS
A type "F" 75 ohm connector is provided for an
external FM antenna.
In addition to the AM low impedance loopstick
antenna, a seven pin DIN connector is provided for an
external AM antenna.
Note: The MX 130 is an AUDIO/VIDEO control center
and will have many pieces of VIDEO equipment
connected to it. VIDEO equipment generates large
amounts of AM interference. Since the MX130 is also
a multi zone unit it is possible that one zone may want
to listen to AM while another watches TV. In this case
AM performance would be terriable so McIntosh is
developing a shielded AM antenna that can plug into
the DIN connector and be placed some distance away
from the interfering VIDEO equipment.
TECHNICAL DESCRIPTION
ELECTRO-MAGNETIC SWITCHING
All audio signal switching in the MX130 is done by
ELECTRO-MAGNETIC methods. ELECTRO-MAGNETIC
switching is an old and proven technology that has been
blessed with modern materials and manufacturing
methods.
Each switch consists of a glass tube that is filled with
an inert oxygen-free atmosphere and sealed with tiny
leads protruding from either end. These leads extend
into the tube and overlap one another with a separation
of a few thousandths of an inch. The leads are made
from a ferrous material that is influenced by a magnetic
field. They are first plated with gold as a base material,
then with rhodium and ruthenium. Ruthenium is the best
contact material known. The glass assembly is then
placed in the canter of a multi-layer coil of copper wire.
The entire assembly is molded together in a tough shock
absorbing plastic. The switch and coil connectors
extend from the bottom in the form of printed circuit
board terminals.
When a DC voltage is applied to the coil, current
flows and creates a magnetic field. The force of the
field causes the leads to bend and contact one another
inside the sealed glass tube. The inert gas eliminates
corrosion of the contacts, which insures a low
resistance, distortion free switch.
SURROUND SOUND PROCESSOR
The internal surround sound processor is made up
of three sections. First is an LSI integrated circuit that
takes a DOLBY SURROUND signal and decodes it to 4
channels. LEFT FRONT, CENTER, RIGHT FRONT and
SURROUND. The signal from the LEFT, CENTER and
RIGHT are added together then put through a low pass
filter to form the SUBWOOFER channel. The
SURROUND signal is fed to a digital TIME LINK delay
circuit, a 7kHz low pass filter and finally to a DOLBY
B type noise reduction section. It is then split into L
& R surround channels. Connectors are provided for
the future addition of THX processing.
MX130 Product Preview/Page 9
MclNTOSH LABORATORY INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903