Edit: sorry, I didn't read this thread very well the first time.
SHORT ANSWER: you don't need to add a 1/4" input. Use the RCA inputs instead.
I think this is the IPA17:http://www.ionaudio.com/products/det...ailgater-am-fm
And this is the IPA03:http://www.ionaudio.com/products/det...k-rocker-am-fm
In contrast to the pics in this thread, the info on the web site indicates that neither of these devices has a 1/4" output (though each one does have two 1/4" mic inputs -- for singing "Islands in the Stream" duets, I think
). The pics here show some kind of 1/4" jack, so assuming it is an output (and not an input), you can do something like this:
* Plug this 1/4" to dual 3.5mm adapter into the 1/4" output of the device that has the output: http://www.monoprice.com/products/pr...seq=1&format=2
* Get two 3.5mm (aka 1/8") male to male cables, connect them to the adapter above, and run them to the other two speakers: http://www.monoprice.com/products/su...02&cp_id=10218
* connect the other ends of the two male to male cables to these (remember to buy two!): http://www.monoprice.com/products/pr...seq=1&format=2
There are several other ways to do the same thing, such as:
* use the 1/4" TRS to dual 3.5mm female adapter linked above, buy two 3.5 male to female extension cables, use the 3.5mm to RCA adapters that came with the Ion Speakers
* (probably 50+ other ways to do it -- you just need to connect the outputs to the inputs, using whatever cables you can, being somewhat careful to use "stereo" cables where needed, as opposed to "mono" -- though it isn't totally clear which parts require stereo since each box ultimately plays mono out of a single speaker)
* is the 1/4" jack on the board really an output (or is it an input -- post pics of the panel so we can see the labels)?
* is the output mono or stereo?
If it turns out that the 1/4" jack is not an output, you could use a y-cable (or two, resulting in 3 outputs) on the source device (ipod) and run separate cables to each speaker.
The Ion Audio web site sucks in that it doesn't show the model number on the product pages, doesn't show useful results for model number searches, and the downloads are pretty messed up (a PDF inside a ZIP? Why?), and the menu does not work if you use an iPad. They should get a new webmaster, add some pics of the i/o and control panels of their devices, and write some reasonably accurate and complete product documentation.