I just received a new pair of SP3 speakers and began their installation
last night. I built a new custom cable to feed the speakers from the
outputs of my stereo amplifier using the pinout data supplied in the SP3
manual. I also verified that the pinout shown pictorially (in two places
in the manual) matched the schematic. Upon installation, nothing worked
correctly -- I could only get right channel audio out of one of the
speakers. I spent a while troubleshooting last night and resumed this
evening. To make a somewhat long story short, I discovered that although
the SP3 pictorials and schematic showed that the input connector
expected right channel audio on the tip and left channel audio on the
ring, the speaker was actually wired for left channel on the tip and
right channel on the ring. Strangely enough, this is exactly the pinout
shown for the speaker and headphone jacks in the K3 and K3S manuals. The
connection from the left speaker output jack to the right speaker input
carries right channel audio from the ring on the tip of the interconnect
cable. I opened up one of the speakers and verified that it was wired to
match the K3 standard. Once I reversed the left and right input sources
the stereo pair started behaving as they should. If you're only using
one SP3 in a mono configuration it will work just fine; it's only when
you try to connect a pair in stereo that the documentation error becomes
troublesome. I'd be real curious to know how the SP3 docs got to be so
wrong. This problem should be corrected ASAP.
73...
Randy, W8FN
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