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OPERATING / SERVICE MANUAL

MPE 28

MIDI PROGRAMMABLE EQUALIZER

QUICK START

Reading owners manuals is like eating vegetables—a nuisance which is necessary, at least according to your mother. It

ensures longevity and proper operation of your systems but chocolate soda is more fun. In the event you want to find a
short-cut we provide this section to help you avoid the spinach. At least read this and save the rest for later. And remem-
ber—clean your plate, people are starving somewhere.

Upon initial power-up, you should see the words, “

Rane MPE 28...rX.X

” (the current revision level) scroll by in

the 

SYSTEM

 display window. Then the 

SYSTEM

 display indicates the last memory location used before the power was

turned off, and the green 

MEMORY

 indicator lights. The MPE 28 is now ready to use.

(The MPE 28 has two levels of security lockout. If you think your unit may be in either of these lockout modes, please

consult the enclosed 

MPE Users Guide

 for further instructions.)

Two terms need to be learned early on. The first is Stored Memory. Stored Memory is any of the 128 locations provided

for curves. The second is Working Memory. Working Memory is a scratch-pad location used for changing curves before
you put them into Stored Memory. Working Memory is also what you hear.

The first few Stored Memory locations (programs 1 to 21) were preset at the factory. A table of these is in the MPE

Users GuideAppendix. In the beginning these give you instant curves for experimenting. If you want a different curve,
press the 

UP/DOWN

 buttons to scroll, or directly enter a Stored Memory number via buttons 

0

 through 

9

 (observe the red

SYSTEM

 display). Please note that all Stored Memory numbers must be at least two digits; e.g., Stored Memory number

4

is entered as 

04

, etc. For direct access to Stored Memory locations above

99

, push the 

100

 button, then the next two digits.

For example, to recall Stored Memory

125

, press 

100

2

 and 

5

, and you will have arrived! Once the last digit is entered,

the Stored Memory is instantly called up (what you see is what you hear).

Changing the overall level or equalizer curve requires the use of the EQ Edit mode. Push the 

EQ

 button (repeated

operation cycles between the 

first half 

of the frequencies, the 

second half 

and 

neither

) to select the frequencies you wish to

modify. Now press 

LEVEL

 or the frequency button desired (the yellow LED lights). Next scroll the 

UP/DOWN

 buttons

until the desired level shows on the green 

EQUALIZER

 display. When finished editing, push the 

STORE

 button once,

enter a new Stored Memory number if needed, then push 

STORE

 again to place the new curve into the Stored Memory

shown on the red 

SYSTEM

 display. Presto facto, it’s Miller time. See the enclosed 

MPE Users Guide

 for futher details.

The MPE 28 presets can be recalled either by front panel or externally through MIDI. If you have a PC with a MIDI

interface, Rane can supply you with a DOS graphic editor program just for asking (no charge). If you have a Mac, see the
Galaxy Universal Librarian from Opcode Systems. Other software companies may have other librarians that will work. If
you would like to change presets with external switches, check out the Rane RPS 4 Remote Program Selector.

CAUTION: NEVER CONNECT ANYTHING EXCEPT RANE MODELS RS 1, RAP 10 OR FRS 8 AC POWER SUPPLIES

TO THE RED THING THAT LOOKS LIKE A TELEPHONE JACK ON THE REAR OF THE MPE 28.

 This is a low-voltage

AC power input and requires some special attention if you use anything except an approved Rane power supply.

SYSTEM CONNECTION

When connecting the MPE 28 to other components in

your system for the first time, 

leave the power supply for last

.

This will give you a chance to make mistakes and correct
them before any damage is done to fragile components in the
system.

INPUT.

 The input on the MPE 28 is balanced/unbalanced.

This means that standard ¼" connectors on the ends of any
good quality cable will work well between your signal
sources, signal processing and amplification. If balanced ¼"
input is your choice, use a Tip-Ring-Sleeve connector; wire
the tip as hot (+), the ring as return (–), and the sleeve as
signal ground. The MPE 28 also gives you the opportunity to
use a 3-pin (XLR) input connector. Balanced operation
through this Input requires pin 2 be used as hot (+), pin 3 as
return (–), and pin 1 as signal ground. Unbalanced sources

require

 that pin 1 be connected to pin 3 

on the Input connec-

tor only

. Therefore, pin 2 is hot, 

pins 1 and 3 are signal

ground

.

OUTPUT.

 The MPE 28 offers a similar choice of output

connector and the wiring is the same as far as polarity of pins
is concerned. 

When hooking up an unbalanced Output using

the 3-pin, disregard the italics in the preceding paragraph.
DO NOT connect pin 3 to pin 1. Leave it open, please. Thank
you.

You should be aware, also, that just because we indicate

that a sleeve on a ¼" or pin one on a 3-pin is used for ground-
ing, it is not always wise to use it. 

Rane Note 110

 (included

with your unit) goes into the reasons and logic behind all of
this madness. Please have a look at it to try to attain the best
performance possible from your MPE 28.

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