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I'm assuming that using a mux/chip to act as a receiver and switch S/PDIF is somehow superior to simply having a mechanical switch or microcontroller switch a series of relays(?) So, how do you switch multiple 32bit >192kHz sources for a Buffalo?
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That question is irrelevant for SPDIF since that can't be 32 bit anyway. For 24/192 you can use the Mux module.
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LeonvB wrote:That question is irrelevant for SPDIF since that can't be 32 bit anyway. Oooh yeah  Well what happens when you add on an Xmos module or whatever the next generation USB solution turns out to be? I am just interested in future proofing as much as possible.
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I have looked quite a bit around for a 32-bit capable I2S MUX but have not found anything in a DIY/kit format.
There are quite a bit of multiplexer chips which I think can do the job but as I'm not able to design PCB's or solder 200-legged smd's I'm also on the waiting list for such a device. In practice I have found it to work quite well simply using a couple of signal relays but this becomes clumsy if you have to select between more than two I2S sources.
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Quote:Well what happens when you add on an Xmos module or whatever the next generation USB solution turns out to be? I agree that using relays would be the easiest way out. Use a microprocessor to let the relays switch between the USB receiver and the Mux unit. And use that same microprocessor to set the correct source on the Mux itself. If available by then, the AC2 would be ideal for that job.
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LeonvB wrote:Use a microprocessor to let the relays switch between the USB receiver and the Mux unit. And use that same microprocessor to set the correct source on the Mux itself. So what you are suggesting (?) is that the output of the Mux has to go through a relay that toggles between the Mux and a high bit/sample rate input. At that point, why not drop the Mux entirely and add N more relays since we've now added a microprocessor anyway? That's what I was originally attempting to ask--if your DAC has an S/PDIF receiver built-in then what does the Mux buy you to begin with? Eliminate switching noise or reflections? It just seems like it provides an unnecessary receiver, and if you're using a mechanical switch to select inputs on the Mux, then that mechanical switch might as well select relays.
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The Mux unit buys you I2S input. It converts consumer level SPDIF to I2S, so you can keep the SPDIF switch in the same position on the DAC board. Unless all of your SPDIF sources are guaranteed to be TTL level, you'll run into the trouble of having to modify the DAC board to enable and disable the on-board comparator.
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