Equalizer Section; 75 Hz Switch; Eq In Switch; High And Low - Alesis Studio 32 Reference Manual

Equalizer section

75 Hz switch

The graphic under this switch shows what this does: it cuts frequencies below 75
Hz at a rate of 18 dB per octave. This is called a "high pass filter", but some
people prefer to think of it as "low cut filter". It's always available to the channel
path, even if the EQ IN switch is out. It is used to filter out undesirable subsonic
frequencies which may be present in the signal (air conditioning rumble, mic stand
noise, etc.).
If you push this switch, you often won't hear any difference, because so few
instruments (and no voices) actually have harmonics below 75 Hz, and many
loudspeakers don't have good response below this point. As a rule of thumb, you
don't want to press the 75 Hz switch on instruments such as kick drum, bass, or
keyboards; but it can be very useful on voices (especially if you're boosting the 125
Hz region to get an effect using the LOW or MID controls).

EQ IN Switch

This inserts the equalizer controls (with the green knobs) into the channel signal
path. When down, the EQ is in the signal path. This switch has no effect on the 75
Hz control (see above). If you're not using the EQ, the channel path will be a little
bit quieter if you bypass the EQ by leaving this switch UP. It's also helpful to see
if the EQ you've spent 10 minutes adjusting is actually helping the sound, by
comparing the in and out positions.

HIGH and LOW

These are standard shelving "treble and bass" tone controls. The HIGH knob range
is +/- 15 dB at a fixed frequency of 12 kHz. This means that frequencies above 12
kHz will be boosted or cut by the same amount , and frequency response between 1
kHz and 12 kHz will gradually rise or fall to the shelving point. The LOW knob
range is +/- 15 dB at a fixed frequency of 80 Hz. This means that frequencies below
80 Hz will be boosted or cut by the same amount, and frequency response will
gradually rise or fall from 80 Hz to about 1 kHz.

MID EQ controls: LEVEL, FREQ, and Q

The Studio 32 features a "fully parametric midrange", which means that you can
control several parameters or aspects of the midrange, besides just cutting and
boosting a predetermined frequency range. Combined with the HIGH and LOW EQ
controls, these make up a 3-band equalizer that can create the vast majority of tones
you may need.
The Mid controls consist of three knobs: FREQuency, MID GAIN and Q
(bandwidth). Notice that the FREQ and Q controls are a lighter shade of green, to
help you identify them.
The FREQ knob changes the center frequency of the EQ. The range is sweepable
between 120 Hz (bass) to 14 kHz (extremely high treble).
Description of Controls
Description of Controls
68