El: I don't doubt your observation comparing the ZR1600 to the Adcom. Adcom amps to me have always tended to get muddy, blurred and jumble things up at volume. This also includes the big ones that Nelson Pass designed and Adcom built to their own spec.
As far as your comments about bypassing the switches, you need twice the amount of contacts on a switch in order to reduce audibility of a decent switch. In other words, two contacts in and two contacts out wired in parallel reduce the audibility of a single switch in the signal path. As such, where one is using a single pole double throw ( spdt ) switch, going to a double pole double throw ( dpdt ) would work better. The only thing with this is that you end up with a whole lot more making and breaking of the signal path and solder joints galore. If you have no fear of overdriving the amp, i would suggest using good quality cabling and bypassing all of that. On top of that, don't forget to break the connections feeding into the circuit at the board level. Having circuitry that is still connected at various points but not active will cause differences in signal loading. Sean
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As far as your comments about bypassing the switches, you need twice the amount of contacts on a switch in order to reduce audibility of a decent switch. In other words, two contacts in and two contacts out wired in parallel reduce the audibility of a single switch in the signal path. As such, where one is using a single pole double throw ( spdt ) switch, going to a double pole double throw ( dpdt ) would work better. The only thing with this is that you end up with a whole lot more making and breaking of the signal path and solder joints galore. If you have no fear of overdriving the amp, i would suggest using good quality cabling and bypassing all of that. On top of that, don't forget to break the connections feeding into the circuit at the board level. Having circuitry that is still connected at various points but not active will cause differences in signal loading. Sean
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