This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Nope; and, it is not "stereo" either. The jack is a standard stereo jack;
but, the "Left" and "Right" outputs are connected to a single 'composite'
source. Possibly, Apple originally intended to supply two-channel sound;
perhaps, the idea was just to simplify connections to stereo systems. (Stereo
devotees get upset when you give them just one 'channel' to plug in.) Whatever,
the fact remains: for multi-channel output you need to add a "stereo board".
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