Operational Overview - Alesis ProLinear DSP Reference Manual

2
Operations

Operational Overview

The ProLinear DSP offers three methods of control:
•
the front panel buttons and LCD
•
the PC software
•
the Input Level control on the rear panel
Through these controls the following functions are managed:
•
Volume
•
Parametric EQ
•
Speaker ID/Channel assignment
•
Input Level monitoring
Volume
Volume is controlled in two ways: by the rear panel Input
Level control and by the Gain Trim parameter accessed from
the front panel (see the Program Mode description in this
section).
The Input Level control adjusts the signal level going into the
Integrated DSP Module. Setting this too high could result in
distortion, and setting it too low could result in unnecessary
noise or loss of resolution.
The Gain Trim parameter adjusts the output gain from
the Integrated DSP Module into the amplifiers, and can
be adjusted within a range of -18dB to +17dB. The
same care must be taken when setting this level so as to
avoid distortion and noise.
Parametric EQ
The ProLinear DSP has a four-band parametric equalizer
that allows a great deal of flexibility in "voicing" the speaker
(setting its tonal balance). Each of the four bands of the
equalizer consists of three settings: frequency, gain and Q.
•
Frequencies can be set in 1/6th octave increments
within a range of 20Hz-20kHz.
•
Gain adjustments may be made for each band within
a range of –12dB to +6dB. The changes from -10 dB
to +6dB are made in 0.1dB increments, while the
changes from –12dB to -10dB are measured in 1 dB
increments.
•
Q values (the frequency range covered by a band)
range from 0.25 to 4.00 octaves. It is possible to
manually select Q values of HSH (high shelving),
LSH (low shelving) HP (high-pass filter). For
definitions of these settings, see page 27.
14
Frequency
Gain
Q
Note: For proper gain
staging, the lowest possible
noise floor, and the most
accurate representation of
the signal, we recommend
the volume be adjusted by
the rear panel control. Use
the Gain Trim feature only
as a temporary measure.