Evident delay for gaming

[eniriop]

The Phantom system e.g. with optical input or bluetooth has a delay of 150-200ms.

Well, 150-200 ms is actually too much for live use. For ordinary playback of stored (or streamed...) music delay does not matter as there is usually buffering involved anyway, but for live use latency should be short - around 1 ms... is a good figure.
Be certain that Kii has thought of studio use when they designed the Three with a setting that gives you low latency. If the Three was only delivered with the 90 ms latency you'd probably never see it in a studio!

According to some posts here in the forum Devialet has a special firmware version that allows a low latency application using the optical input. I assume this fw is used with the Dante dongle, too in special installations and with this fw multiple Phantoms are not synchronized using Dialog. When you use the webinterface of the Phantoms on port 8000 there is a menu item to upload a custom firmware. I do not have such a fw. But for djing or studio applications one can contact Devialet. Same for multispeaker applications (5.0 or 7.0 systems), this is indicated on their website.

If you have DOS 2  and use an audio optical cable to send the audio to your phantom premier or reactor you can set the audio delay in the devialet app on your smartphone to a minimum of 60 ms in the parameters of the speaker that receives the optical cable. But You cannot set the audio delay in DOS 1 (spark).