Altair EQ-215, Руководство пользователя

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FREQUENCY SWITCH x10:
This switch is associated with the parametric filter frequency control, and in combi-
nation with this allow a frequency adjustment between 32Hz and 16KHz. With this switch
unpressed, the frequency control allow a frequency adjustment between 32Hz and
1,6KHz. With this switch pressed the frequency control adjustment vary between 320Hz
and 16KHz.
FREQUENCY CONTROL:
The parametric filter frequency control, associated with the frequency control
switch, previously described, allow a frequency adjustment between 32Hz and
16KHz, this allow to cover practically the whole audible band.
BANDWIDTH CONTROL (Q):
This control allow the adjustment of the parametric filter bandwidth, is to say
the amount of band that the parametric filter cover. With the control turned to
the left (Q=0,5), the parametric filter cover a great amount of audible band,
because of the change of the filter gain will be easily appreciable by the hear, on the
other hand, with this control turned to the right (Q=10), the parametric filter cover a small
amount of audible band, because of associated with a filter gain of -30 dB constitute a
notch filter that allow remove coupling, eliminating the lesser amount of audible band.
ON/OFF SWITCH:
The parametric filter ON/OFF switch , allow enable/disable the parametric filter. If
the parametric filter is not used, is convenient disable it with this switch, instead of to put
the gain control in the 0 dB position, since avoid the signal pass by the parametric filter
circuit, with the resulting improvement in the graphic equaliser signal to noise ratio.
FADERS
The graphic equaliser model EQ-230 provide thirty band-pass filters per channel,
separated 1/3 octave according to the I.S.O. standard and the graphic equaliser model EQ-
215 provide fifteen band-pass filters per channel, separated 2/3 octave according to the
I.S.O. standard. Each graphic equaliser band-pass filter is controlled by a fader control
(with indicator LED), with a variation range between ±12 dB or ±6 dB, according to the range
switch position of the corresponding channel. In the first graph of the next page we can
appreciate the graphic equaliser model EQ-230 response curve with all bands enhanced
+12 dB, and in the second graph of the next page, the graphic equaliser model EQ-230
response curve with different enhances/attenuations at 1KHz. In this second graph we can
appreciate the constant bandwidth (constant Q) of the band-pass filters, is to say, the curve
shape remain constant, and therefore for small enhance in one band, the interation with the
other ones is minimum.
FADER STATUS SWITCH
The graphic equaliser model EQ-230 provide three fader status setups: LEDs ON, SCAN
and LEDs OFF, depending on the fader status setup switch , placed at the graphic equal-
iser rear panel.
The 2/3 octave model EQ-215 provide two fader status setups:: LEDs ON and LEDs
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ALTAiR
EQ-215/230 GRAPHIC ECUALISERS