Art RP-1, User Manual

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5
LOW CUT FILTER control
The Low Cut Filter is a single tuned High Pass Filter. The input
signal can be filtered to remove low frequency information. The
roll off frequency is set at 100Hz. Since it is single tuned, it
preserves some low frequency content so its use is less
obtrusive. It is especially useful in close mic’d applications
cutting out pops and wind noise.
Variable Impedance Function
Using this variable impedance function allows the user to adjust
the input impedance seen by the microphone, in turn achieving
better tonal response from your microphone used.
Dynamic Mic
Dynamic (coil) microphones are sensitive to loading. If these
mics are not coupled correctly, the result maybe a loss in
frequency response and could result in added distortion.
As an example a common mic like the SM57 prefers a 600ohm
load. When the load is varied above or below the 600ohms,
then the mid range resonance could sound harsh and distorted.
The low-end response will also sound more controlled with a
600ohm load. There are many dynamic mics that may have
similar issues but not be as sensitive to loading as the SM57.