02-Jun-2019, 06:52
(01-Jun-2019, 22:52)David A Wrote:(01-Jun-2019, 22:00)martynbaker1 Wrote: One small interesting point, it appears SAM inverts the phase of your speakers for some reason. This was apparent because I use a subwoofer and needed to flip the phase 180 once SAM was switched off. Anyone know why this happens?
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One of the things SAM does is to correct phase errors in the bass region. Take a look at the phase and impedance plots in any speaker review in Stereophile and you will see quite large phase swings was a matter of course. I've seen a comment somewhere, can't remember where, saying that phase correction alone can add up to half an octave bass extension to a speaker.
SAM won't be "reversing the phase". What it does won't be as simple as a complete phase reversal. The phase will be changing by different amounts at different frequencies. Phase controls on subs that simply offer 0 and 180 degree options are pretty crude and the correct phase setting will almost certainly be somewhere in between those options but one of them will be closer to correct than the other. SAM is probably shifting phase in the area where the speaker is crossing over to the sub by just enough to make the opposite setting on the sub work better.
That’s interesting. Yes the REL G2 only has 180, hence I actually delay the speakers in the Dev configuration to get the timing right. Perhaps me finding things a bit slow might be the lack of SAM or the slight phase difference with the sub now SAM is off. Interesting... some more exploring when I have more time...
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