A/B amplifier switching

I'm looking for ideas for switching between 2 amplifiers and one set of speakers.Right now I have a 2 channel system and home theater system sharing a pair of Merlin vsm speakers.The 2 channel amp is a Art Audio Jota supplied by a Art Audio preamp.The home theater amp is a Proceed BPA supplied by a HT processor(Anthem D1).Speaker cables are Cardas Golden Reference.Right now I manually swap the speaker cables back and forth between amps depending on usage.Any ideas for a switch box manufactured or DIY and of a quality to match my equipment to perform the amplifier swapping?