I didn't know that bi-wiring was also called "shotgun" bi-wiring 
. Accordingly, I have always used the shotgun variant it seems. Two separate runs of cable joined to two connectors at the amp end, but four separate connectors at speakers (for a two-way) The other variant would be a cable with four leads, like the Canare 4S11 here: https://www.bluejeanscable.com/store/speaker/index.htm and the same connector scheme.
The advantage of the first variant is that one can mix cable types to tailor treble sound for example, but not affect bass/mid sound. With the Canare (type) cable this will obviously not be possible.
With bi-amping you need one amp channel per drive unit. I don't see any advantage to this with a D440 or D1000. With bi-amping it would be 2xD220 or 2xD250, not 440 or 1000..
If you, on the other hand, bypass the internal passive cross overs in the speakers and use active filtering in the amps (DSP) it's a different story. This can improve sound quite a lot, but you really need to know what you are doing here. You need to measure the response through the passive filters in your speakers to replicate this in the amps. You'll need Devialet's help to calculate this. If you use SAM today you should also have a new SAM profile with the cross over bypassed. If you are even a little bit unsure, don't do it!
In the end, bi-wiring will cost you more, but may result in less improvement than you expect.
. Accordingly, I have always used the shotgun variant it seems. Two separate runs of cable joined to two connectors at the amp end, but four separate connectors at speakers (for a two-way) The other variant would be a cable with four leads, like the Canare 4S11 here: https://www.bluejeanscable.com/store/speaker/index.htm and the same connector scheme.The advantage of the first variant is that one can mix cable types to tailor treble sound for example, but not affect bass/mid sound. With the Canare (type) cable this will obviously not be possible.
With bi-amping you need one amp channel per drive unit. I don't see any advantage to this with a D440 or D1000. With bi-amping it would be 2xD220 or 2xD250, not 440 or 1000..
If you, on the other hand, bypass the internal passive cross overs in the speakers and use active filtering in the amps (DSP) it's a different story. This can improve sound quite a lot, but you really need to know what you are doing here. You need to measure the response through the passive filters in your speakers to replicate this in the amps. You'll need Devialet's help to calculate this. If you use SAM today you should also have a new SAM profile with the cross over bypassed. If you are even a little bit unsure, don't do it!
In the end, bi-wiring will cost you more, but may result in less improvement than you expect.
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Devialetless!
Roon, ROCK/Audiolense XO/Music on NAS/EtherRegen/RoPieee/USPCB/ISORegen/USPCB/Sound Devices USBPre2/Tannoy GOLD 8
250 Pro CI, MicroRendu(1.4), Mutec MC-3+USB
Devialetless!
Roon, ROCK/Audiolense XO/Music on NAS/EtherRegen/RoPieee/USPCB/ISORegen/USPCB/Sound Devices USBPre2/Tannoy GOLD 8
250 Pro CI, MicroRendu(1.4), Mutec MC-3+USB
