7
USING WITH THE RADIAL PHAZER
Combining a microphone with the JDX 48 can be very rewarding but to
really go all the way, you have to consider the problem you have created
by combining both sounds: The signal coming from the amp through
the JDX 48 is traveling at the speed of light (via electron ow), while
the corresponding sound arriving at the mic capsule via the speaker is
travelling at the speed of sound. Thus, the speaker/mic signal arrives
later than the direct JDX 48 signal due to the time it takes it to travel
through the air. This difference in phase alignment causes cancellation
at various frequencies commonly known as 'comb ltering'.
You have to now ‘correct’ the situation by aligning the two signals 'in time'
so that their fundamental frequencies are in phase. To make this all work,
you will of course need to use two channels on your mixer; one for the
mic’ed signal; and the other for the direct feed from the JDX 48. You will
also need the Radial Phazer™.
JDX 48
AMPLITUDE
TIME
Microphone
Phase off-set
JDX 48 and Microphone
in perfect time-alignment.
AMPLITUDE
TIME
The Radial Phazer is a line level, analogue phase controller that allows
you to adjust the direct feed from the JDX 48 so that it is in phase (in time)
with the mic’ed signal. Connect the Phazer to your mixing console using
the insert point on the JDX 48's channel strip. This can be done with
balanced or unbalanced cables or using a typical insert cable with TRS
at one end, and two 1/4'” plugs at the other. (See the Radial Phazer’s
user guide for more details)
Once connected, simply turn the phase adjustment knob clockwise
slowly starting from the left until you nd the sweet spot. This will be
when the two sounds combine to create a fat rich bottom end. The
Phazer makes it easy to phase align the two signals by ear because you
can hear the tone change in real time.
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