Rane RPM 26i Operator'S Manual Download

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Manual-16

EXTENDED PARAMETRIC (PEQ+)

Some DSP Programs provide “Extended”

Parametric EQ, abbreviated

PEQ+

. Extended

parametric simply means that two of the available
PEQ filters contain extended capabilities. These
two special PEQ filters support various EQ filter
types, such as high pass (

) or low pass (

)

Linkwitz-Riley, Butterworth or Bessel filters, these are
abbreviated

and

Bsl

, respectively. Different slopes

for each of these filter types are also available, allowing

dB/Oct.,

dB/Oct. and

dB/Oct. filter implementations

, 3

or 4

order), where applicable. In any extended

parametric, only the

first

and

last

filters contain the extended

capabilities; 1 and 4, in the above example screen.

The purpose of Extended Parametric is to give the RPM

26i the capability to implement up to a 6-way crossover.
Since each PEQ+ output can implement any crossover
frequency range, treating each output as its own crossover
band, provides multi-way crossovers.

Hint:

For midband crossovers, use 2 bands with one set

for

, the other set for

and overlap them.

Note:

Operation of Extended Parametrics (PEQ+) is

exactly like regular parametrics (PEQ),

the only difference is

when you choose

Cut

Bsl

filter types for a given

filter, the

Level

and

BW(Q)

settings for that filter have no

effect and are ignored by RaneWare.

The

Shelving

filter type

also ignores the

BW(Q)

setting.

The

Filter Type

selection box is edited by clicking the

down arrow and selecting a new

Filter Type

such as

Low

Shelf

High Cut

or a

Normal

parametric filter. (See the

Extended Parametric section below for additional filter types
such as Linkwitz-Riley, Bessel and Butterworth filters.)
Those systems that require constant directivity horn equaliza-
tion can use the

CD Horn

Filter Type

(in combination

with other PEQ filters) to achieve the appropriate EQ for the
combination of horn and compresssion driver you are using.
For optimum frequency response, use an analyzer to achieve
the best possible horn EQ compensation.

The bandwidth, abbreviated

BW (Q)

, for each parametric

EQ filter is edited with the horizontal scroll bar. There are 80
steps between a bandwidth of 0.036 and 2.543 octaves. The
horizontal scroll bar adjusts the bandwidth control in three
ways. Clicking the left or right arrows adjusts the bandwidth
one step at a time. Clicking between the arrows and the
sliding box (thumb) adjusts the bandwidth 10 steps at a time.
Clicking and holding the thumb allows dragging the control.

Bypass

check box appears on the bottom right allowing

the selected PEQ filter to be bypassed. This is essentially
equivalent to setting that filter’s level to zero. This is useful
when comparing the effect of a single PEQ filter’s frequency
response contribution. A small red ‘

’ appears over the top of

the circled filter number to indicate that the filter is bypassed.
(See filter #4 on the example screen to the left.)

The bypassed

filter’s response graph does not change on the parametric
graph, but it does on the

Overall Response

graph

(double-

click on the Output’s screw terminal). The Overall Response
curve also shows the contributions of the crossover and the
high/low cut filters (if applicable). See the Overall Response
section on page Manual-20 for further details.

A right mouse click on the parametric detail window pops

up a menu allowing flattening of the

current

(

Flatten Filter

Level

) or

all

PEQ filters (

Flatten All Filter Levels

). This same

right mouse click menu allows bypassing all PEQ filters (

All

Filters Bypassed

) for conveniently comparing equalized and

unequalized settings.

You can also

Copy

(select

Copy

)

and

Paste

(

after

Copy

ing) the PEQ settings from one PEQ to another from

this menu. The PEQ copy and paste scheme allows you to
copy, for example, the first three PEQ bands from a 6 band
parametric into a 3 band PEQ. The three extra bands, 4, 5 & 6
in this case, are simply ignored by the 3 band PEQ. The same
goes for pasting from a 3 band into a 6 band PEQ. Only the
first three bands’ settings will be copied into the 6 band PEQ
and bands 4, 5 and 6 will be unchanged after the paste.

This makes it easy to set up one processing block, then

copy settings to other blocks.

COMPRESSOR

Most DSP Programs provide a program

compressor on each input. The compressor’s
purpose is to alter the dynamic range of the
incoming signal. Compressors are simply fancy
volume controls. Only the volume level is
altered by compression. When compression
occurs, the compressor turns the volume down in a tightly
controlled manner. The

Threshold

is a voltage level setting

above which compression (or turning down the volume)
occurs. The

Ratio

tells the compressor how much to turn the