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PHASING
T o test two microphones and/or their cables for proper
phasing, connect them to an amplifier and talk or sing into
them while holding them thrce or four inches apart. The
sound from the speakers should be the same when talking
into either microphone or directly between them if they
are in phase with each other. If the sound drops drastically,
o r if a dead spot is found when talking between the two
microphones, they are out of phase. All cables and micro-
phones should be tested in this manner
tb
insure that they
are in phase with each other.
T o change the phase of a microphone, the microphone
cartridge leads must be interchanged (see Figure 2 ) . This
should be performed by your dealer, the Shure Factory
Service Department, or other qualified service personnel.
IMPEDANCE
Your Model PE585 is a high-impedance microphone. If
cable lengths over 7.6 meters ( 2 5 feet) are required, or
if the microphone is to be connected to a low-impedance
input, it will be necessary to transform the microphone
line to low impedance. Shure Model A95 Series Line
Matching Transformers are available for use in those cases.
These transformers provide a proper impedance match
between a high-impedance microphone line and a low-
impedance input and are supplied with various input and
output connectors.
V
USING MORE THAN ONE MICROPHONE
It is often desirable for a group to use a separate micro-
phone f o r each individual performer. I n this case, the
following points should be remembered:
1. It is best if the microphones are individually controlled
for volume through a separate Shure microphone
mixer. If this is not possible, it is desirable that each
performer use the same type and model of microphone
so that the group as a whole will be "balanced."
2.
Check the placement of the microphones with relation
to loudspeakers (as previously mentioned) so that
feedback is minimized.
3.
As additional microphones are added the possibility of
feedback increases. T u r n off, or down, unused micro-
phones to help solve this problem.
SHURE FEEDBACK CONTROLLER
Lets you "tune" your sound system to the acoustics of the
room. The result is more overall sound power withoul
feedback. Eight linear-motion filter controls are infinitely
variable from 0 to 12 dB cut. Below 63 H z and Above
8 kHz roll-off switches attenuate low and high frequencies.
Can be installed between mixer or console and amplifier
for total system control, or following each microphone as
a single-channel preamplifier with feedback control.
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