I can understand you not wanting to get rid of your Klipsch speakers: typically they always get the best reviews for computer speakers.
This is an Intel-based iMac you are talking about? I am surprised the move to Intel would have prevented Macs from using those speakers. I went to the Apple store just the other day and they had Klipsch speakers connected to an Intel iMac.
Do you have an Apple Store or a good and knowledgeable Mac store close to your home? Maybe you could ask the sales people there. The only thing I can see is maybe the connector doesn't fit? You don't add reasons why they wouldn't work so this is a shot in the dark here. Or maybe you need an external sound card that would support surround sound: although I think the Intel iMacs have surround sound support.
Maybe someone else can drop in here and offer more ideas.
First question, not to be rude, but did you try them? Speakers are not specific to PC or Mac. You should be able to plug your iPod or any sort of device 3.5mm jack into them and they should work.
Make sure the volume is up and so forth. Test them on some other device if you think it's the computer is the problem.
Bryan
The problem is that his model has three miniplugs, which means he won't be able to use all the channels of his speakers since the iMac only has a single audio output plug.
couldn't you get an adapter? Wouldn't that work? I don't know much about computers, but I'm sure they make an adapter that would work with that. Good luck
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