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This would be a worthwhile purchase for a group of individuals or an audio club for situations like this:

ABX Switch Comparator
Due to high demand we have produced another run of our ABX Switch Comparator. This unit allows seamless switching of up to two preamplifiers, two power amplifiers, and three sets of speakers either with or without subwoofers. The AVA ABX Switch can be used to evaluate cables and component parts...
avahifi.com