Aphex EQF 500 - Manual (Page 4)

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The EQF 500 is a reissue that is our modern take on the classic
Aphex EQF-2 500 series equalizer. The original EQF-1 500 module
was designed in 1976 while the EQF-2 500 was an upgrade that
included shelving EQ for the high and low bands.
The newly designed EQF 500 module has an improved control
layout and modern components have been incorporated for lower
noise than the original. A Jensen JT11K8 nickel input Transformer
and Jensen JT-11DL nickel output transformer provide the cleanest
possible balanced input and output signal.
2.0 INTRODUCTION 3.0 CONTROLS & INDICATORS
3.1 HIGH FREQUENCY CONTROLS
These controls let you optimize the high fre-
quency band. The range is from 1kHz to 20kHz.
The selected frequency can be cut or boosted
by 12dB. Pressing the bell curve button
changes the high frequency EQ from a shelv-
ing EQ to a peaking EQ. The button will light
when it is in peaking mode. The bandwidth or
“Q” is preset to one octave at maximum boost.
3.2 MIDRANGE FREQUENCY CONTROLS
These controls lets you optimize the midrange
frequency band. The range is from 250Hz to
5kHz. The selected frequency can be cut or
boosted by 12dB. The bandwidth or “Q” is
preset to one octave at maximum boost.
3.3 LOW FREQUENCY CONTROLS
These controls lets you optimize the low
frequency band. The range is from 20Hz to
500Hz. The selected frequency can be cut
or boosted by 12dB. Pressing the bell curve
button changes the low frequency EQ from a
shelving EQ to a peaking EQ. The button will
light when it is in peaking mode. The band-
width or “Q” is preset to one octave at maxi-
mum boost.