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HOW THE PHASE SWITCH WORKS
The Trinity Pro Preamp has a miniature phase
switch mounted inside, next to the battery. It is a
sliding switch and you can slide the little tab up or
down with your finger. There are only two settings.
Phase switches are usually marketed as a feedback-
controlling device, but they accomplish more than
just that. Phase determines at what point in time a
sound wave has its peak or trough.
This picture shows two (basically identical) waves,
but the wave on the right (2) is inverted with respect
to the wave on the left (1). Interestingly, if these two
waves were played back simultaneously from the
same speaker source with the same volume, they
would completely cancel each other out and no
sound would be heard. There would be silence.
You know when an amplified signal just doesn’t
“sound right”? In a dual-source system, chances are
it’s a phase-match problem when the sound waves
coming from one source are partially canceling out
the waves coming from another source.
In pickup/mic combination systems, it’s actually a
very common problem that the mic is out of phase
with the pickup. The phase switch allows you to
simply “flip” the sound waves of the mic so that
they match the pickup. The result is that “aaaaahh”
smooth tone that just sounds right.
An out-of-phase problem is indicated by early
feedback and tinny, unbalanced sound. This may be
tolerable in some tone ranges (positions on the fret
board) and quite noticeable in others, even resulting
in sound cancellations on some notes.
The phase switch allows for instant correction of this
problem. By toggling the phase switch back and
forth, you will notice fuller, warmer and nicely
balanced tone with less feedback in one setting.
This is the correct phase switch setting. Keep in
mind that it may be different with different
amplification systems.
PREAMP TECHNICAL DATA
Frequency response: 10-30,000 Hz
Inputs: Instrument jacks 1 Mega Ohm
Output: Instrument jack 10 Kilo Ohm
Battery consumption: 4.5 Milli Amp
Battery life: about 50 hours
All K&K products are designed, assembled and
packaged in USA using mainly US and European
components. Thanks again for choosing K&K.