LP Formats: UD -4
Almost every Quad Collector is aware of the many attempts at getting
4 channels of audio onto a vinyl LP. The early Matrix systems (RM, EV, DY) soon gave way to the more elaborate SQ and
QS systems from Columbia and Sansui, while JVC developed the CD-4 system which
delivered true discrete performance. What many Quad Collectors don't know is
that there was an additional "system", developed by DENON in Japan for
reproducing a true 4 channel source on a vinyl disc, and those that are aware of
the system actually know very little about it. There are many misconceptions
surrounding UD-4. Hypothetical explanations abound, but there is little concrete
information on the web to clarify and put to rest all of the speculation and
false truths about this format.
Thanks to one of our members,
we have the information on these few pages that actually describe and explain
the process of UD-4. There were only a handful of LPs ever released in this
format, and a listing of those titles can also be found below.
Anyone with additional info or
documentation on UD-4 is welcomed to email us and we will be glad to incorporate
that material into these pages.
Here are some of the QuadraphonicQuad resources on UD-4
AUDIO ENGINEERING SOCIETY PAPER
ON THE UD-4 SYSTEM (Scanned)
NOTE: All writings, logos, and
information within these pages is provided for informational purposes only.
These writings and trademarks remain the property of the original rights
Last Modified 10/28/2004
c 2004 QuadraphonicQuad