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In Reply to: is it possible to avoid using a selector switch in a TVC preamp with multiple inputs? posted by gordan on April 9, 2007 at 17:24:37:
It would be better if U implemented a high quality selector switch.The unused "open" input lines that would be connected at all times in the scenario U propose above, will be susceptible to adding all kinds of noise pollution/RF to the input signal and that noise will be mixed in the source signal......not good.
IME, it would be far better to implement a high quality selector switch such as the DACT CT3 and use RCA/XLR shorting plugs, or at the very least, RCA/XLR plug caps on the unused inputs.
Cheers,
Follow Ups:
In a minimalist passive, some claim best results with an audio-quality 4PDT or bigger switch (such as E-Switch), but using two paths through the switch simultaneously for each signal phase.
I think a rotary selector switch like a ELMA or even better a Shallco is not too much of a comprimise to the sound. It saves the wear and tear on cable connectors. Switching both hot and ground, you can use a ganged rotary (2 deck/6 pos/2 pole) and implement a 3 inputs w/ inverted phase on alternate positions. I find that phase is clearly audible and varies from one recording to another. The ability switch phase is essential to get the best sound, and switching at the input of a transformer is the easiest and least intrusive way of implementing this capablity.
Doh!! Now I can claim to have had a reason for buying those switches with more positions than I needed.
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