Altair EQ-215, Руководство пользователя

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HIGH PASS FILTER CONTROL
Each graphic equaliser channel provides a high pass filter of 12 dB per oc-
tave, that are used for limiting the band width for lower frequencies in the equaliser
output . The high pass filter adjustment may vary between 10 Hz and 300 Hz. In a
normal application, in that we want to have available all the audible spectrum, we shall put
the high pass filter in 10 Hz.
This filter has many applications: imitation of the telephonic sound, adjustment of the
sound system band width to the speaker band width, momentarily elimination of couplings
in low frequencies.
BYPASS SWITCH
Both channels of graphic equaliser, provides of a bypass switch . When this switch
is pressed, the band-pass filters, the parametric filter (only EQ-230) and the high pass filter
remain unavailable, remain operative only the level control, and light a red indicator associ-
ated with this switch. If we placed the level control in the 0 dB position, we will obtain a real
in/out by-pass.
The utility of this switch is to check the equalisation effect over the sound system.
RANGE SWITCH
This switch , setup the band-pass filters variation range of each graphic
equaliser channel (provide one per channel). With this switch depressed, the band-pass
filters have a variation range between ±12 dB, and the corresponding ±12 LED remain light-
ing. When this switch is pressed, the band-pass filters have a variation range between ±6
dB, and the corresponding ±6 LED remain lighting.
The band-pass filters variation range setup by means of this switch, allow us a greater
equalization control in sound system that don't need a great gain/attenuation level by band.
while in sound system that need a greater gain/attenuation level, decrease the equalization
control.
PARAMETRIC FILTER (ONLY EQ-230)
The graphic equaliser model EQ-230, provide one parametric equalization filter (is to
say in that are adjustable the three equalization parameters: gain, frequency and band-
width), per channel. This parametric filter is a complement to the band-pass filter, allow us
an additional equalization with a great control over it, since this equalization point allow the
adjustment of its three parameters. This three parameters are adjustable by means of three
controls and two switches, explained bellow.
GAIN CONTROL:
The parametric filter gain control, allow an adjust b15 dB and -30
dB. In -30 dB position, and with a little bandwidth (with the bandwidth control
rotate to the right), will be setup like a notch filter, is to say a filter that allow
remove one coupling, eliminate the minimum audible band. With this control
placed at the 0 dB position, the parametric filter don't work.
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ALTAiR
EQ-215/230 GRAPHIC ECUALISERS