Rane FAC 28 Bedienungsanleitung

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OPERATING / SERVICE MANUALFAC 28

ACTIVE CROSSOVER

QUICK START

No one likes to read manuals. Everyone likes to plug in and turn on. That’s usually OK,

and with only a very few exceptions, damage is unlikely to result from such procedures when

initiating the use of a FAC 28.

It is a good idea to begin with all LEVELcontrols set to their full counterclockwise

position. Unless you are certain that there is an electrical inversion in one of your amplifiers or

drivers, set both POS INVswitches to their POSpositions. Both MUTEswitches should be

out. If you are using a constant-directivity horn, set the HORN EQ IN/OUT switch to the IN

position and adjust the frequency control per the recommendations of the horn’s manufac-

turer. Set the position. Set the crossover selectorPHASE IN/OUTswitch to the OUTFREQ

to the frequency recommended by the speaker manufacturer. Power up the system and set the

input and output levels for appropriate performance.

NEVER CONNECT ANYTHING EXCEPT AN APPROVED RANE POWER

SUPPLY TO THE THING THAT LOOKS LIKE A TELEPHONE JACK ON THE

REAR OF THE FAC 28. This is an AC input and requires special attention if you do not

have an operational power supply EXACTLY like the one that was originally packed with

your unit. See the full explanation of the power supply requirements elsewhere in this manual.

SYSTEM CONNECTION

When connecting the FAC 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 your fragile speakers, ears and

nerves.

INPUTSon the FAC 28 are balanced. The 3-pin (XLR)

uses pin 2 as “hot” or “+”signal polarity, pin 3 is “return”or

“–”and pin 1 is signal ground. If unbalanced operation is

required, drive pin 2 as hot and pin 1 as ground. The ¼" Input

is a tip-ring-sleeve connector. Tip is “+”, ring is “–”, and

sleeve is ground. Unbalanced ¼" inputs should drive tip as

hot and sleeve as ground and may be either a “mono” ¼" or

TRS ¼" with the ring left open or tied to sleeve, your choice.

See Rane Note 110 for further information on this subject.

OUTPUTS. The FAC 28’s Outputs are balanced as well.

As with the 3-pin Input, pin 2 is hot and pin 3 is not. Pin 1 is

signal ground. True balanced operation requires only the use

of pins 2 and 3 for signal and either case ground (chassis) or

pin 1 signal ground for shielding. If unbalanced output is your

preference, use pin 2 as signal and pin 1 as return. Use case

ground for shield. The ¼" Output is a tip-ring-sleeve charac-

ter whose polarities match the Input connector. Again, have a

look at Rane Note 110 for more detail.

THE LOW SUM INPUTis used to combine the Low

frequency Outputs of two crossover modules (mono sub bass

in stereo applications). To take advantage of this feature, the

LOW OUT of one crossover module connects to this unbal-

anced Input. The sum of both modules low frequency

selections then appears at the LOW OUT of the module

whose LOW SUM INPUT is being driven.

3-WAY, 4-WAY etc. Two or

more FAC crossovers may be used

together to produce 3, 4 and 5-way

systems. To accomplish this, the

first unit is driven with full range

audio. The sub bass output is taken

from the LOW OUT of the first

module, the HIGH OUT of the first

module then drives the main INPUT

of the second. For 3-way applica-

tions, mid and high are taken from

the LOW and HIGH OUTS of the

second module, respectively. If a

four way system is being con-

structed, the HIGH OUT of the second module drives the

third, the LOW OUT of the second module becomes the

low-mid, the LOW OUT of the third module is the 3rd

frequency range, the HIGH OUT of the third module becomes

the 4th. See the diagram on the back page of this document as

well as the Flex User’s Guide for more details.

CHOICESneed to be made regarding which Input and

Output connectors to use. Generally, the ¼" ins and outs work

well enough and are definitely cheaper to use in terms of

labor and material required to terminate cables with ¼" plugs.

The 3-pins do, however, provide a locking mechanism for

situations where physical abuse can be a problem. The 3-pin

also provides a tighter connection and can be more impervi-

ous to corrosion and stresses of time and environment.

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