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MS
Matrix Schematics
and Construction Information
Line
Driver-Receiver and Other Alternative Applications for the MS
Matrix Board
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The MS Matrix is Offered as A Bare Circuit Board or
with PC Board and THAT ICs
This is the MS
Matrix based on the design published in the Pro Audio Design Forum. The
Precision MS Matrix uses high accuracy THAT1240 line receivers to perform mid-side
sum and difference functions providing crosstalk performance unobtainable
with conventional precision resistors.
The Precision M/S Matrix provides simultaneous encode/decode capability.
THAT1246 line receivers and THAT1646 OutSmarts®
line
drivers provide fully-balanced I/O
for the encoder and decoder inputs and outputs.
The THAT1240 used in the Precision M/S provides resistor ratio matching
that is typically 0.005% enabling full encode-decode crosstalk
performance that is typically >60 dB across the full audio band. In
the precision monitoring mode, which bypasses the encoder line driver
and decoder line receiver, crosstalk is typically >75
dB. The
precision monitoring mode allows the matrix to remain in the path
permitting the effects of insert processing to be isolated for precise
"A-B" comparison and level-match.
Additional unbalanced
insert points are provided for encode left and right (post line
receiver), encode mid and side (pre line driver), decode mid and side
(post line receiver), and decode left and right (pre line driver). These
additional insert points permit muting, level trim and precision
"end-to-end" (E-E) monitoring via external circuitry.
The decode path has user-adjustable gain or attenuation before the final L and R
outputs to provide overall unity gain E-E operation. If a variable gain encode
option is required for the M and-or S channels to reduce "mono
build-up," the decode section can be used to encode (and vice-versa) with
reduced precision. The MS board can also operate as two simultaneous encoders or
decoders by simply redefining its connections.
In addition to duty as an MS Matrix, the insert points allow the board to be
used as a four channel balanced line driver-receiver without MS encoding. Two of
the four THAT1646 line driver outputs provide user-selectable variable gain. The
MS Board configured as a line driver receiver is the "Swiss
Army Knife" of balanced I/O.
The discussion thread for the Precision M/S Matrix is featured in the Pro
Audio Design Forum. Test results including crosstalk, noise and
distortion performance are here.
There's a GearSlutz discussion on the Precision M/S Matrix here.
This is a bare PC board and does not include any components.
THAT1240, THAT1246 and THAT1646 ICs are available in addition to a kit
containing the PC board and THAT ICs. Most of the passive
components and the dual op amp (a 5532 or equivalent) can be purchased from Mouser Electronics and a bill-of-materials
is available on the Pro Audio Design Forum.
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In
Stock!
Bare PC Board
$19.95 US
PC Board Including
THAT ICs for MS Matrix
( 4 each THAT1240, 1246, 1646.)
$63.95 US
PC Board Including
THAT ICs for Line Driver-Receiver
(4 each THAT1246, 1646.)
$49.95 US
PayPal accepted.
Does not include shipping or sales tax.
Prices are in US dollars.
As of 1/22/2012 shipping rates are:
US PCB via Priority Mail $5.15
US Kit via Priority Mail $7.50
US Kit qty>1 Sent via UPS
International PCB via Priority $16.95
International Kit via Express Varies
International Kit qty>1 Inquire
Shipping rates are subject to change without notice.
To purchase or contact us, e-mail
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