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Some KVM will do this. I have a Belkin 4 port KVM that can handle this. However this may be overkill for what you want. Also note that only 1 computer can send a signal to the speakers at a time. You could just use a simple multi-pole switch and switch the output of the computers to the speakers.LM3 said:I would like to be able to run 4 PCs through one set of speakers. What do I need?