How to guide: Setting the delay between the left and right speakers.

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So i pull out the devialet card for my left amp, input a 100us delay on the sub pre-out, speaker pre-out enabled and pre-out disabled.
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From here i pulled the slave card out and changed the delay from 100us to 90us and the next photo is the result
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So if i set the delay to 85ms it was the left channel a little bit behind, set to 90 is the right channel thats a bit behind... i was trying to set the figure to 86, 87, 88 etc but it reverts to either 85 or 90 as soon as you click ok.

I assume when you say 85 ms in the last paragraph you mean 85 us (microseconds) - right?

If that is the figure you ended up with to get the impulse traces to coincide, by my maths that corresponds to a distance of just under 3 cm.  My guess is that that could be due to asymmetry in the distance between the microphone and each speaker.  It's probably quite hard to get much better accuracy than that, I would think.  In any case it's much smaller than likely variations due your head changing position while listening...