Rane RPM 26v - Manual (Page 20)

Manual-20
THE OVERALL RESPONSE CURVE
Double-clicking on any output’s screw terminal
(shown at the right) opens the Overall Response curve
window (shown below). The displayed curve(s) display
the frequency response contribution of the equalization
settings currently active in the
RPM 26v. Though not necessarily useful unless you are
implementing a 6-way crossover, it is possible to display the
Overall Response curves for all six of the RPM 26v Outputs.
The output(s) being viewed are indicated by the check boxes
on the bottom left of the window. These boxes provide a
convenient way to quickly display the response curves of
other outputs or combinations of outputs. Two radio buttons
labeled A and B, allow selection of the prefered Input (A or
B) for the response curve comparison, when an output
contains the simple sum of the two Input signals. It is not
possible in RaneWare to display the “calculated” sum of the
response curves. This information has limited relevance to the
acoustic sum of the responses. It is more insightful to use an
analyzer to perform this task. The curves shown are the
calculated responses of the RPM 26v. Do not mistake these
curves for the response of your system. It is highly recom-
mended, and some would say, required, to use a high quality
analyzer to get a true indication of your system’s overall
response. These analysis devices include the contributions of
all components of the system, including the RPM 26v,
amplifiers, cabling, loudspeaker and generally the room
responses.
The check boxes on the bottom right allow viewing of the
Input EQ (either High/Low Cut or PEQ filters), Crossover (if
applicable) and
Output EQ (parametric EQ). This makes it
convenient to independently view the frequency response
contribution of the various filter sections in the RPM 26v.
The graph in the example above does not show the contribu-
tion of the crossover, since the
Crossover box is unchecked.
Right mouse click on the Detailed Response Window to zoom
in or out, or to print.
LIMITER
For most DSP Programs, each output is
supplied with a Limiter. The limiter is meant to
be a safety device to stop the RPM 26v Output
from exceeding a predetermined threshold
voltage.
The Limiter block has an indicator that turns yellow when
the output reaches the limiter’s Threshold.
Double-clicking on the Limiter block opens the Limiter
detail window. Scroll bars for adjusting the Threshold, Attack
and Release times appear on the left. There are three ways to
alter the settings with the scroll bar. Click and drag the
Thumb to the desired value, click between the Thumb and the
arrows to adjust in large steps or click the left or right arrows
to adjust in single steps. The
Limiting indicator on the bottom
left indicates when the signal has reached the Threshold. This
Limiting indicator corresponds to the indicator on the Limiter
block in the Device Edit screen.
Each Limiter contains a Combine selection box. Limiters
are combined when the numbers in the selection boxes match.
The choices are
None, 1, 2 or 3. None in a selection box
indicates the given Limiter is tied with no other Limiter.
When Limiter Combine boxes share a common value, for
example, 3, then those Limiters are Combined together. The
Combined Limiter with the most gain reduction always
dictates what instantaneous gain reduction, attack and release
settings are applied to each
Combined channel in its group.
This maintains the spectral balance between the Combined
channels and helps maintain your program’s left-to-right
image.
The Limiter’s Threshold setting can also be edited if you
click and drag directly on the graphed curve. The vertical
position of the cursor corresponds to the
Threshold level once
the curve is successfully grabbed. The curve changes color
when successfully grabbed.