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Rane MPE 47 Manual
OPERATING / SERVICE MANUAL
QUICK
MPE 47
START
Reading the owner’s manual is an absolute unmitigated drag. I mean it’s for wimps. For the non-wimps in the crowd we
offer this Quick Start section, so you don’t embarrass yourself in front of your friends.
Upon initial power-up, you should see the words, “Rane MPE 47 . . . r1.0” (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 47 is now ready to use.
(The MPE 47 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 (up to 32 maximum) were preset at the factory. In the beginning these may be
used to 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 of either channel requires the use of the EQ Edit mode. Push the EQ button
(repeated operation cycles between Ch.s l-2, Ch.s 3-4, and neither) to select the channels you wish to modify. Now press
LEVEL (repeated operation cycles between 1 and 2, or 3 and 4) or press 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 location shown on the red SYSTEM display. Presto facto, it’s Miller time. Please see
the enclosed MPE Users Guide for further details.
SOFTWARE UPDATES
Please till out and mail in the enclosed registration card. Notification of any software revisions will be mailed to all
registered users. Failure to register could result in missing important update information.
SYSTEM CONNECTION
When connecting the MPE 47 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 your fragile
speakers, ears, headphones, et al.
INPUTS. Inputs on the MPE 47 are balanced/unbalanced. This means that standard 1/4" connectors on the ends of any
good quality cable will work well between your signal sources, signal processing and amplification. If balanced 1/4" inputs
are your choice, use Tip - Ring - Sleeve connectors; wire the tip as hot, the ring as return (-) and the sleeve as signal ground.
Use 1/4" mono connectors for unbalanced sources.
OUTPUTS. The MPE 47 offers unbalanced (only) output connectors. Use standard 1/4" mono shielded cable for interconnect.
You should be aware, also, that just because we indicate that a sleeve on a 1/4" is used for grounding, 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 attain the best performance possible from your MPE 47.
Front Panel Description
1. BYPASS 1, 2, 3 & 4. Pressing any button toggles between Bypass and Active modes (LED on = Bypass).
2. STORE. Pressing this control transfers the contents of Working Memory into Stored Memory at a location selected by
either the number keys or the UP/DOWN buttons. Pressing STORE once prompts the user for the Stored Memory location;
pressing it again writes the information to Stored Memory.
3. OL 1, 2, 3 & 4. Ch.’s 1, 2, 3 & 4 overload (OL) indicators. These red LEDs illuminate any time the inputs, filters or outputs of the channels reach 4 dB below clipping.
4. EQUALIZER Display. This numeric green LED display indicates the boost/cut level of an individual filter, or the overall level, whichever is selected (LED on). The MPE 47 must be in the EQ Edit mode to activate this display.
5. EQ. Pressing this button once places the MPE 47 in the Channels 1-2 EQ Edit mode (CHANNELS 1-2 LED on); a
second depression enters the Channel’s 3-4 EQ Edit mode (CHANNELS 3-4 LED on); and a third time takes the MPE 47
out of the EQ Edit mode (both LEDs off).
6. LEVEL/ EXPRESS. In the EQ Edit mode, this button allows setting the overall level of either channel. When not in the
EQ Edit mode, this button sets Expression parameters. Expression is a mode that allows an EQ curve to “bend” (change)
based on MIDI continuous controller or channel pressure aftertouch commands. Please see the MPE Users Guide for further information.
7. 50Hz/BANK. In the EQ Edit mode, this button selects the 50 Hz filter. In the Normal Operating mode, pressing this
control locks the MPE to the current bank; something similiar to a “tens hold” function. When using the octal numerical
base system of notation instead of the decimal numerical base system of notation (explained in the MPE Users Guide) it has
a similar function.
8. 125Hz/100/OCTAL A/B. In the EQ Edit mode, this button selects the 125 Hz filter. In the Normal Operating mode this
gets you directly to the 100s, or switches between A/B banks when using the octal numerical base system of notation.
9. Filters/Numerals. In the EQ Edit mode, these buttons select the filters associated with their labels. In the Normal
Operating mode they allow direct access number entry for Stored Memory selection. They also select several “secret” features when used with the FUNCTION button. To find out more about their other uses, please see the MPE Users Guide.
10. 12.5kHz/FUNCTION. In the EQ Edit mode, this button selects the 12.5 kHz filter. In the Normal Operating mode it
acts as a shift-key to select secondary functions. Again we must reference the MPE Users Guide for details. Sorry.
11. UP & DOWN. Used to increase or decrease parameters in all operating modes.
12. SYSTEM Display. This red digital display indicates system information, such as Stored Memory locations, MIDI Channel selection, mapping assignments, lockout codes, Factory preset numbers, ramp step size, revision number, and so on.
13. MEMORY. Used to enter the Normal Operating mode. A flashing LED indicates Working Memory differs from
Stored Memory. When in the EQ Edit mode, all changes to the Working Memory are compared with the Stored Memory
version by simply pressing and holding the MEMORY button. What is heard is the Stored Memory curve; releasing the
MEMORY button allows you to hear edited Working Memory.
14. MIDI CHANNEL. Pressing this button displays the current MIDI Channel assignment for this MPE. Flashing indicates
MIDI OMNI mode is on. Change the MIDI Channel by using the UP/DOWN buttons, or number keys. Pressing this button
again returns the unit to Normal Operating mode.
15. MAP. Used for MIDI Mapping covered in the MPE Users Guide.
Rear Panel Description
1. 1/4" CHANNEL INPUT. This is a tip-ring-sleeve (TRS) balanced input connector. Tip is (+), ring is (-), and sleeve is
ground. For unbalanced operation, use either a mono or stereo TRS plug. If using a stereo plug, short the ring to the sleeve.
2. 1/4" CHANNEL OUTPUT. This is a mono tip-sleeve (TS) unbalanced output connector. Tip is (+) and sleeve is ground.
Use either a mono or stereo cable. When using a stereo TRS plug, connect your hot lead to the tip, ground to the sleeve and
leave the ring open.
3. MIDI IN. This connector allows the MPE 47 to respond to external MIDI control.
4. MIDI OUT. This connector drives the input of another MIDI device.
5. MIDI THRU. This output contains all the MIDI information exactly as it comes into the MIDI input. None of the controls on the MPE 47 have any effect on this output. Normally used for daisychaining purposes.
6. Remote Power Supply Input. USE ONLY A RANE MODEL RS 1 OR OTHER REMOTE AC POWER SUPPLY APPROVED BY RANE. The MPE 47 is supplied with a remote power supply suitable for connection to this input jack. Consult
the factory for replacement or substitution.
7. GROUND LIFT Switch. This switch gives the user the option to tie signal ground to chassis ground. Typically, a system
is quieter in the LIFT position. See CHASSIS GROUNDING note on last page for details.
8. Chassis Ground Point. A 6-32 threaded hole used for chassis grounding purposes. See CHASSIS GROUNDING note
on last page for details.
OPERATING INSTRUCTIONS
THE BASICS. Don’t be intimidated by the fact that the
MPE 47 is a programmable equalizer with a lot of buttons
on the front and none of the familiar slide controls and
rotary pots and such. The product is very straightforward
and following the steps below should get you started.
ALWAYS THINK FOUR. The MPE 47 has four independent channels. You can set up separate EQ curves for
each channel; however when it comes to memory operations all four channels are affected together. There are 128
possible memory locations TOTAL, not 128 locations for
each channel. Each Stored Memory location is split into 4
pieces — one for each channel. The MPE 47 stores four
channels at a time, You cannot store one channel without
the others. If you edit one channel and store it, you also
store the other 3 channels with it. They are not changed,
but they are stored with the new changed channel. When
you recall a Preset Curve, you recall four preset curves.
They may be different, but they are all recalled at once.
When you use Curve Weighting, you are using four curves
to weight four channels at one time. Just remember that
anything you do with memory, you do to all four channels
at a time.
EDITING CURVES. Changing the overall level or
equalizer curve of any of the channels requires the use of
the EQ Edit mode. To edit any curve push the EQ button
(repeated operation cycles between Ch.’s 1 & 2, Ch.’s 3 &
4, and neither) to select the channels you wish to modify.
Now press LEVEL or any of the 7 frequency buttons (the
yellow LED lights to acknowledge selection). Next scroll
the UP/DOWN buttons until the desired level shows on the
green EQUALIZER display. When finished editing all four
channels, push the STORE button once. The number in
the SYSTEM display starts blinking to remind you to
select a location, or to use the current one. Enter a new
number if needed, then push STORE again to place the
four new curves into the Stored Memory location shown.
The MPE Users Guide should be consulted for further
details.
STORING CURVES. Four curves (one for each channel)
are stored in any of the 128 memory locations at one time.
Once stored, this location is referred to as the Stored
Memory location. To begin the process, press STORE
once. This causes the SYSTEM display to begin blinking
the current Stored Memory location number. If you want
to store your Working Memory curves into this location,
press STORE again and your wish shall be granted. If not,
select another Stored Memory location using the number
keys or the UP/DOWN buttons. When the correct location
is displayed, press STORE again. The four curves in the
selected location have now been replaced with the four
curves of the current Working Memory.
COMPARING CURVES. A most useful feature is the
ability to compare the changes you have just made with
what is in the Stored Memory location. The MPE 47
makes this easy by using the MEMORY button when in the
EQ Edit mode. All changes to the Working Memory are
compared with the Stored Memory by pressing and holding the MEMORY button. The letter C appears on the
EQUALIZER display indicating a compare function is
being performed. While the MEMORY button is held,
what is heard is the Stored Memory curve; releasing the
MEMORY button allows you to hear the edited Working
Memory version.
USING STORED CURVES. To use any of the curves in
Stored Memory, all you do is show the Stored Memory
location on the red SYSTEM display. Whatever number
shows is the label of the Stored Memory location for the
current Working Memory.
Working Memory is the scratch pad where you work.
You can think of it as the 129th memory location (like the
19th hole in golf), except you cannot actually store anything here — only operate on it, or listen to it. When a
Stored Memory location shows up on the SYSTEM display, the curves are actually in two locations: safely stored
at the memory location shown and in the Working
Memory scratch pad, ready for you to change if you want.
You can do anything you want to the Working Memory
without altering the original stored version. When complete, you must store these new versions either in place of
the old curves, or into a new location. This is the significance of the MEMORY light blinking. Once you do
anything to the original curves, the MEMORY light starts
blinking to remind you that you have changed them.
If you want a different curve, press the UP/DOWN buttons to scroll, or directly enter a 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. Once the
last digit is entered, the program is instantly called up
(what you see is what you hear). What could be simpler?
BYPASS MODE. Pressing either BYPASS 1,2,3 or 4
causes all audio in the selected channel to be routed
around the equalizer electronics. Please note that a
bypassed condition cannot be stored. If recalling a flat
curve is required, simply store a program in which all filter
and level controls are set to zero.
MIDI CHANNEL. Pressing the CHANNEL button displays the currently assigned MIDI Channel. Pressing
UP/DOWN increases or decreases the MIDI Channel number. You may select from 1 through 16, or Off.
OTHER FEATURES. To say the MPE 47 does a lot
more than explained in this brief space is like saying a personal computer makes a good paperweight. Please read
the MPE Users Guide for a more in-depth look at your
MPE 47.
POWER SUPPLY. As noted elsewhere in this manual,
NEVER USE A POWER SUPPLY WITH YOUR MPE 47
OTHER THAN THE ONE SUPPLIED FROM THE FACTORY OR AN EXACT REPLACEMENT OBTAINED
FROM RANE CORPORATION. The MPE 47’s power
supply input is designed for an AC supply, delivering 1824 volts, from a center-tapped transformer capable of supplying at least the current demanded by this product.
Using any other type of supply may damage the equalizer
and void the warranty (which at two years parts and labor
is worth safeguarding, don’t you think?).
Additional information, application hints and full technical specifications will be found on the enclosed MPE 47
Data Sheet.
IMPORTANT NOTE
FCC & VDE NOTICE
This equipment has been tested and found to comply
with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules, and similar requirements found
in European specifications VDE 0871/0875. These limits
are designed to provide reasonable protection against
harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case
the user will be required to correct the interference at
their own expense. USE OF SHIELDED MIDI CABLES
IS REQUIRED FOR FCC COMPLIANCE.
CHASSIS GROUNDING
The unit is shipped with its Ground Lift switch in the
CHASSIS GND position. This ties signal ground to chassis
ground. If after hooking up your system it exhibits excessive hum or buzzing, there is an incompatibility in the
grounding configuration between units. Here are some
things to try:
1. Try combinations of lifting grounds on units supplied
with ground lift switches (or links).
2. Verify all chassis are tied to a good earth ground.
3. Units with outboard power supplies do NOT ground
the chassis through the line cord. Make sure these units
are solidly grounded by tying the Chassis Ground Point to
known earth ground. Use a star washer to guarantee
proper contact.
Copyright 1989, Rane Corporation 10802 47th Ave. W. Mukilteo, WA 98275 (425)355-6000
520-164 1289
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