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In the latter case, the relative positions of the capsules and switchable pick-up/rejection pattern options will effect what arrives at the mixer.
According to the manual, there is a 180 degree phase reversal switch on the black box. http://kksound.com/products/trinitypro.php Unfortunately, it fails to make clear which signal is having its phase reversed with respect to what else. Try it anyway.
Considering that the transducer elements respond to the physical vibrations of the soundboard whereas the gooseneck mic responds to the air moved by the vibrating soundboard, there ought to be a fractional delay. If there is a simple summing mixer inside the electronics box, this could introduce a processing delay.
the switch in the K+K mixer box is just to reverse the phase of the mic relative to the transducers
The in-guitar mic responds first, then the transducer
the mics about 10 or 12 inches away respond around 48 samples later, which is about 1ms
I just noticed that both the K+K channels are out of phase with the mics. I have now time-aligned them, and brought back into phase: sounds much richer
Time aligning after the fact is one way to achieve signal coherence. Alternatively, make a feature of the timing difference by creative use of panning.
But be sure to check in mono.
Have you tried with a single mono mic plus the transducer only?
Been experimenting with mics recently. I get more done when things are simpler...so, two mics or just one...depending on application. Maybe you want a nice stereo solo acoustic sound...or maybe you’re burying something mono in the mix.
I've just been recording with a stereo pair until now. Did try a stereo pair with a large mono mic too, not very happy with that.
I wanted to see if adding these transducers and inner mic was useful
So far the answer is - sounds awful unless you correct the time alignment, then you can work with it, and there is some extra sound in there, but as you guys say, simpler is probably better: I expect to probably stick with stereo mics
If you want that big stereo sound then a good sounding room and a stereo pair further away are normal.