M6 don't, SpeakerLink only. DSP5200.2 has two SPDIF digital inputs, Meridian SpeakerLink RJ45 in and out
miniDSP IO8 has SPDIF outputs.
Devialet Phantoms are optical - TOSLINK.
Yes, sorry. I should have said digital coaxial inputs like the D600 have.
If DSP speakers had analogue inputs I would have simply upgraded to the newest model I could afford years ago.
Just to clarify a couple of points, in response to your earlier comments:
1. While the M6 speakers (or the DSP3200/3300 for that matter) only have SL connections, I was making the point that you can still connect any of these speakers to a non-SL controller (processor) by using an adapter such as the AC11, AC12 or reviver.
2. DSP5200.2 has an SL input (+SL output) and a single SPDIF input (+ a SPDIF output to the slave speaker) _ you can think of SL as SPDIF on a Cat 5 connection _ in a similar way that, Digital Coax is just SPDIF on a phono connector and TOSLINK is SPDIF via an optical connection
3. All of the above speakers will require a Meridian controller/processor for multichannel use.
4. MiniDSP-IO8 has SPDIF outputs that would connect directly into the multichannel digital inputs on the G6x processor (e.g. MD 1-3). Processors carry two MD inputs (568.2mm only has one, but you can use a component video or via switcher if you need two). I don't know if you could connect the MiniDSP IO8 directly to your D600 speakers. Normally, you need the controller/processor to set the speaker distances/delay times and volumes for the DSP speakers, but I don't know if you could do that from your PC (with all of your speakers set up to the same volume level).
5. You could still use Devialet Phantoms by using an optical converter.
Brian