I too am looking to do this and so far all I've found is a creative
labs CB2500 which isn't available in north america. Any other ideas?
In this day and age of FM transmitters, wireless headphones and such
I'm surprised it's hard to find something for our specific application.
Transmission power is limited so the fidelity may be lower
than expected, or else it's digital and that tends to drive
up prices quite a bit more than a piece of cable.
There are some products though, it just depends on how you
want to get the job done logically. For example-
http://www.dlink.com/products/?model=dsm-120
"Sending audio" isn't very specific. We could assume in
it's simplest form it means the system sound output is
converted to analog or digital transmission to a receiver at
the stereo, but in doing that, you might have to be at the
PC to control it instead of at the stereo.
The other remaining question is, "in this day and age of FM
transmitters", already concedes there are wireless FM
transmitters. So why not just use one? It's input is the
PC's output, the stereo receiver tunes that. Possibly one
step up from that would be the following (but I have no idea
how well it actually does),
http://www.progressive-concepts.com/info/item.html?id=288
but it's still analog. Whether that is better or worse that
2.4 or 5.8GHz digital, might depend on the quality of the
device and it's ability to pre-buffer enough that any other
devices in same freqency range don't cause significant
interference. 1W at 10ft with your choice of analog
frequency could sound pretty good, certainly less
degradation than already present on may PC lossy compressed
audio formats.
Here's an option with integral amp to directly drive the
speakers. If the PC is the control for the stereo anyway,
it may not need the rest of the *stereo rack* at all, just
to get that signal from the PC to the speakers, amp'd.
http://www.amazon.com/Transmitter-Amplifier-Amplifiers-Extenders-Converters/dp/B000KE7K86
Other more cost effective options might be searching for
"USB wireless Audio" on ebay, adding the keyboards "FM" Or
"2.4GHz" depending on type desired.
Basically we need a more clear definition of the
requirements besides "good device". Otherwise some might
think at a mere 10 feet distance, even some crummy little
MP3 player car FM transmitter would suffice... and it might,
but probably not - more likely it would be the lowest
quality result.