ADA Preamps > MB-1

MB1 vs. MP1/MP2 Chorus

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MarshallJMP:
How does the MB-1 only chorus the mid and high frequencies of the full signal spectrum?
Is it by way of splitting the signal with a high-pass filter before the chorus section input, feeding the chorus processor with only the high-pass filtered signal and then combining the processed signal with the dry full range (or bass-frequency content only) signal near or at the preamp's outputs?

==>That's the way it works in the MB-1

And by the way, all ADA's guitar preamps' (not the MB-1) claim that the chorus is stereo.
What sort of stereo are they referring to? From what I recall, it doesn't seem to divide the Left/Right signal into chorused vs dry only signals - L/Wet | R/Dry (as the Roland Jazz Chorus amps' seems to do).

==>the signal in the MP-x is divided in L/wet R/wet signal (wet is180° phase shifted on one side), all of the stereo chorus effects I know off work this way



The MP2 manual also states that the stereo chorus is the point where the signal splits and becomes stereo.

At the same time, the MP1 manual says that if you sum its two outputs on a mixing board (i.e. without fully panning those outputs), it will result in phase cancellation of the chorus.
This seems to support the L / 50% Dry + 50 % normal phase wet | R / 50% Dry + 50% inverted phase wet theory.

==>correct
 
But how do they achieve a mono chorused signal without any phase cancellation if one only uses the mono output A of the preamp?
Instead of simply being a mix/sum of both outputs, does it only output the original Left signal, i.e., discarding the inverted phase chorus signal altogether and only outputting a mix of the dry and normal phase chorused signal?

==> for the mp-1 the A out is the original signal with the chorus signal mixed in, the B out is also the original signal but with the chorus signal phase shifted 180° mixed in , so if you plug in in either side you will get one of these signals, but if you hear it in mono it doesn't matter, now if you mix both signals together you will only get  the original signal due to the fact that the 2 chorus signal are 180° out of phase ,when you mix them together they cancel each other out

astrobushido:
Great info, MarshallJMP, that's exactly what I need to know!

A few final questions:
- do you (or anyone else) know what is the crossover frequency of the high-pass filter on the MB-1 and what's its slope?
- does the high-pass chorused signal gets combined with the bass full range dry signal or a low-passed dry signal?


Thanks a lot once more!

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