6
Load Impedance
Maximum SPL capability, output clipping level, and dynamic range vary with the input load imped-
ance of the preamplifier to which you connect the microphone. Shure recommends a minimum input
load impedance of 1000 Ω. Most modern microphone preamplifiers meet this requirement. Higher
impedance results in better performance for these specifications.
Stereo Pair Stand Adapter
Stereo microphone techniques give depth and spatial
placement to sound sources for broadcasting, recording,
or sound reinforcement applications. The Shure A27M al-
lows you to mount two microphones on a single stand with
a wide range of angles and vertical separations for a vari-
ety of coincident and closely-spaced stereo configurations.
Installation
1. Adjust the vertical separation as
shown.
2. Mount on a stand and attach micro-
phones using 5/8"-27 thread stand
adapters.
3. Adjust the microphone angle using
the knurled knob. Use the 45 de-
gree reference marks at the top of
the knob to set the desired angle.
Stereo Techniques
The following table displays the most common stereo techniques. Keep in mind that microphone
technique is largely a matter of personal taste; there is no one “correct” microphone position. For
more information, search “Stereo Techniques” at www.shure.com (www.shure.com/stereo-tech).
Û
R
L
L
30 cm
90°
R
L
17 cm
110°
R
Û
R
L
Summary of Contents for KSM137
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