Sure.

You will need two A/V switch boxes (composite video and left/right analog audio -- two inputs, one output). On the first box, connect the center channel from each source (DVD-A and SACD) to the composite video inputs and the left and right channels from each source to the left and right analog audio inputs. Connect the video output to the center channel in on your receiver's six-channel analog input and the left/right to the left/right inputs. On the second box, connect the sub outputs to the composite video inputs and the surrounds to the left/right inputs; connect the output to the receiver. If the DVD-Audio player is hooked to the "A" input on both switches, then pressing "A" on both will let you use the DVD-Audio player. By the way, the six audio channels can be connected to any of the switch's inputs as long as you are consistent on both players; I picked specific inputs (center to composite video, for example) just for the sake of the example.

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