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the red LED turns on when you are approaching signal overload or
"clipping".
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THE EQ SYSTEM
Using the LF Filter
AEA RPQ2 LF Filter Response
The RPQ500 was designed to complement ribbon microphones.
AEA Big Ribbon™ mics deliver sub-woofer lows, which the RPQ500
renders faithfully. Such strong low-frequency content can mask high-
frequency intelligibility, so the tunable low-frequency (LF) filter was
engineered to reduce low-frequency energy to appropriate levels.
Directional microphones when moved closer on-axis to a sound source
become more sensitive to low frequencies. This proximity effect,
otherwise known as "bass tip-up," becomes more pronounced the
closer the distance. With some large transducer microphones, such as
the AEA/RCA R44, proximity effect begins at six feet and is extremely
pronounced at a distance of one inch.
LF filters can tame proximity effect and reduce other unwanted low-
frequency noise, such as air-conditioning rumble, traffic noise, "P-pops"
and breath-noise. However, a fixed-frequency, constant slope low-cut
filter cannot handle all situations effectively. The RPQ500 offers a
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