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In Reply to: RE: The real issue with switch boxes posted by E-Stat on March 07, 2008 at 09:54:42
I think this gets back to an earlier post of yours where this was discussed. Frank Van Alstine was complaining about the design of ABX boxes. In his words:
"What the ABXers fail to understand is that the distortion characteristics of an amplifier are reflected back into its input jacks because the feedback loop contains these distortions. Since the inputs of the amps are being fed from a common source, the sum of the distortions of both amplifiers are present at the input of either amp being used."
He's saying that only the amp outputs are being switched, and not the inputs. IOW, he claims that the amp inputs are connected together rather than using a switch. Thus the distortion fed back appears at the input of both amps, making them sound the same. This is probably the most technically astute hypothesis of how ABX might mess things up that I've ever seen. However, the box does not actually work as he describes. The relay box for the original ABX setup is shown here. It's clear from the diagram on the box that "Group I" switches the inputs, while "Group III" switches the outputs. The amps are not driven from a common source at all. They are not connected together, except by a user error. It's a true transfer switch as desired, and contrary to Frank Van Alstine's claim.
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