Rane FPL 44 Handleiding
Rane
Mengpaneel
FPL 44
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Pagina 1/4
OPERATING/SERVICE MANUAL
FPL 44
Q U I C K S T A R T
In deference to the ecological movement, Rane has made a commitment to keep its manuals
short and to the point. After all, we’re in the electronics business, not the tree industry. In
deference to your patience, we include this hurry-up section.
Inputs on the FPL 44 are 1/4" TRS balanced/unbalanced. Outputs are balanced 3-pin (XLR).
Positive appears on the tip of the input and pin 2 on the output; negative is the ring of the input
and pin 3 on the output. Signal ground is either sleeve or pin 1.
Front panel settings include four THRESHOLD controls, four BYPASS switches and four
SLAVE switches. The THRESHOLD controls set the level at which output limiting occurs.
BYPASS directly connects the input to the output. The AUTO-SLAVE switch connects the VCA in
the channel to the “slave” bus. In this position all channels in AUTO-SLAVE limit by the same
amount when any one channel exceeds its threshold level. The channels may be. set at different
thresholds to suit the requirements of each situation. If one channel is overdriven by, say, 10 dB,
its gain and the gain of all others in the slave mode reduces by the same 10 dB.
NEVER CONNECT A NYTHING EXCEPT AN APPROVED RANE AC POWER SUPPLY
TO THE THING THAT LOOKS LIKE A RED TELEPHONE JACK ON THE REAR OF
THE FPL 44. This is an AC power input and requires special attention if you do not have a
power supply EXACTLY like the one originally supplied with your unit. A Rane Model FRS 8 or
RAP 10 power supply is acceptable as well. Please see the full explanation of power supply
requirements elsewhere in this manual.
When connecting the FPL 44 to other components of a sound system for the first time, LEAVE
THE POWER SUPPLY FOR LAST. This allows for any mistakes to be identified by visual inspec-
tion and corrected before power is applied and it becomes too late.
INPUTS on the FPL 44 are balanced. The hardware provided for input connectors are 1/4" tip-
ring-sleeve jacks. The tip of the jack is the positive input, the ring is the negative input and the
sleeve is signal ground. Unbalanced inputs may either ground the ring or leave it open while driv-
ing the tip with the unbalanced signal. The FPL 44’s input circuitry is of the instrumentation vari-
ety, eliminating concern over open negative inputs, while ensuring equal differential and
common-mode impedances.
OUTPUTS. The outputs on this device are balanced as well. They differ from the inputs only by
way of their hardware implementation. The Flex philosophy dictates using 1/4" connectors for sig-
nal flow inside of a rack. Lines likely to exit a rack are of the 3-pin variety. If you read the “Quick
Start” section above, you already know that pin 2 of the output connectors is positive, pin 3 is nega-
tive and pin 1 is signal ground.
POWERING UP. In the opening paragraph it was stated that a good visual inspection often elimi-
nates disasters before applying power. It cannot be overstated how important it is to use the correct
power supply with this and all Flex modules. The Rane RS 1 single AC power supply (included
with each module) as well as the Rane FRS 8 and RAP 10 power supplies are the only power sup-
plies certain to work properly with this limiter. If another power supply is to he considered, it must
be an AC supply. It must have an 18 to 24 volt center-tapped output and be wired to a 6-pin mod
connector in accordance with the requirements of the Rane standard.
S Y S T E M C O N N E C T I O N
1. CHANNEL BYPASS SWITCH. This switch provides a passive bypass of each chan-
nel of the FPL 44. When pressed in, it directly connects the positive, negative and signal
ground inputs to the positive, negative and signal ground outputs of the channel. It is pro-
vided to allow easy A/B comparison of limiter activity. It also serves to pass the audio sig-
nal around the active circuitry of the limiter in the event of power failure.
2. BYPASS INDICATOR. This red LED illuminates to advise the operator of a bypass
condition, i.e., BYPASS switch pressed in.
3. LIMIT THRESHOLD CONTROL & INDICATOR. The calibrations (in dBu,
0 dBu = 0.776 Vrms) around this knob indicate the point at which the output limits. All lev-
els higher than this setting are reduced to this preset amplitude. The indicator illuminates
when the preset threshold is exceeded.
4. AUTO-SLAVE SWITCH. In the INDEPENDENT position (“down” in the vertical
orientation,
“right” when horizontally mounted) each limiter channel operates separately.
In the AUTO-SLAVE position (“up” in the vertical orientation, “left” in the horizontal),
each channel limits the same amount that any other channel in the slave mode does. If only
one channel of the possible four is set to this mode, it operates independently. If two or
more are set to AUTO-SLAVE, all slaved channels will attenuate the same amount when
any one exceeds its THRESHOLD.
5. POWER INDICATOR. This yellow LED illuminates when an appropriate power sup
ply is connected to the FPL 44 and is, itself, connected to an appropriate power source.
For the definition of “appropriate power supply,” please refer to the front page of this man-
ual. It doesn’t really make a lot of sense to beat this issue to death alter having done so
twice on the first page.
FRONT PANEL DESCRIPTION
R E AR PA N E L D E S C R I PT I O N
1. 3-PIN OUTPUT CONNECTOR. One of four, this connector provides either a balanced
output on pins 2 and 3 or an unbalanced output between pins 2 and 1. Pin 2 is positive, pin 3
is negative and pin 1 is signal ground.
2. 1/4" TRS INPUT CONNECTOR. Each of the four channels of the FPL 44 makes use of
one of these to supply either a balanced or unbalanced input to the limiter circuitry within.
For balanced operation, the positive signal is applied to the tip, the ring receives the negative
and the sleeve is to be used for signal ground connection. Unbalanced input may be applied to
each channel by driving the tip and using both ring and sleeve for signal ground or the sleeve
alone. The simplest unbalanced input connection is realized by using a tip-sleeve (often re-
ferred to as a mono) plug which eliminates the need for ring worry.
3. GROUND LIFT SWITCH. This switch (mounted on the side) provides the ability to sep-
arate chassis ground and signal ground. Normally, this switch should be in the LIFT position
(pull toward the rear). In some circumstances it may be necessary to move it to the opposite
position to eliminate stubborn hum and buzz problems.
We realize a scientific explanation of this switch would be helpful, unfortunately science
doesn’t seem to have much to do with it. See the CHASSIS GROUNDING note on the last
page for details.
CAUTION: If you are tempted to try moving this switch with your power amplifiers turned
on or turned up, DON’T BE. ALWAYS TURN YOUR AMPLIFIER LEVELS DOWN BE-
FORE CHANGING YOUR GROUNDS AROUND and then bring them up slowly.
4. POWER INPUT CONNECTOR. This is the spot where the “appropriate power supply”
connects. Again, for a complete definition of the power supply, look across to the facing page
for information concerning the location nearest you.
5. GROUND CONNECTOR. Since the FPL 44 is powered from a remote AC power sup-
ply which does not carry chassis ground through to the grounding pin of the AC cord, this
threaded hole has been provided in case your system does not have another earth grounding
means such as through rack rails, etc. Its use or disuse should be determined by your specific
application.
Product specificaties
| Merk: | Rane |
| Categorie: | Mengpaneel |
| Model: | FPL 44 |
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