Rane FAC 28 Manual

Rane Ikke kategoriseret FAC 28

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Side 1/4

OPERATING / SERVICE MANUAL FAC 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 LEVEL controls 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 INV switches to their POS positions. Both MUTE switches 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/OUT switch to the OUT FREQ

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.

INPUTS on 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 INPUT is 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.

CHOICES need 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.

FRONT PANEL DESCRIPTION

1. INPUT OVERLOAD INDICATOR. This red LED will illuminate any time the

input stage is driven to within 4dB of clipping. This level is a function of both

input signal level and the position of the input gain control.

2. INPUT LEVEL CONTROL This rotary control determines the input gain of

the crossover. Its range is from -20dB to +6dB. The majority of applications

should find this control set at 0dB for unity gain.

3. HIGH OUTPUT OVERLOAD INDICATOR. This red LED will illuminate

anytime the high frequency output of the crossover is driven to within 4dB of

clipping. This level is a function of both the INPUT level and the HIGH fre-

quency output LEVEL control.

4. HIGH OUTPUT LEVEL CONTROL. This rotary control determines the

amount of gain to follow the high frequency output of the crossover’s frequency

dividing network. Its range covers OFF to +6dB.

5. HIGH FREQUENCY INVERT SWITCH. This two position slide switch

electrically inverts the high output in the INV position. This may be necessary

where drivers or amplifiers are wired incorrectly or when the crossover’s phase

control lacks sufficient range (more that 180 degrees becomes necessary).

6. HIGH FREQUENCY MUTE SWITCH. In its in position, all output signal

from the High Output of the crossover will be totally muted. This is to be used

when initially setting Levels of the Low Output and during the Phase alignment

process.

7. HORN EQ DEFEAT SWITCH. If a constant-directivity horn is to used on the

High Output, set this switch to the IN position.

8. HORN EQ FREQUENCY CONTROL. This rotary control allows a continu-

ously variable adjustment of the frequency at which boost begins to occur. This

should be set based on the horn manufacturer’s recommendation.

9. CROSSOVER FREQUENCY SELECTOR. This rotary control offers 24

precise frequencies at which the crossover makes the divide between the High

and Low Outputs. It is a binary encoding switch which sets up the digital control

of the filter’s frequency dividing circuits for very high precision.

10. PHASE CONTROL BYPASS SWITCH. In its OUT position, the phase

control has no effect on the low frequency output.

11. PHASE ANGLE CONTROL. This rotary control provides a constantly

variable 0 to 180 degree phase shift between the Low and High Outputs.

12. LOW FREQUENCY OVERLOAD INDICATOR This red LED illuminates

any time the Low Output comes within 4dB of clipping. This level is a function

of INPUT level as well as LOW frequency Output LEVEL.

13. LOW FREQUENCY LEVEL CONTROL. This rotary control varies the

output gain of the LOW frequency section from OFF to +6dB.

14. LOW FREQUENCY INVERT SWITCH. This switch electrically inverts the

polarity of the low output in the INV position. This may be necessary for many

of the same reasons cited in #5, above.

15. LOW FREQUENCY MUTE SWITCH. Identical to #6 above, with the

exception that it Mutes the Low Output.

16. POWER INDICATOR Illuminates whenever the correct AC power is applied

to the unit from a remote power supply.

Produkt Specifikationer

Mærke:	Rane
Kategori:	Ikke kategoriseret
Model:	FAC 28

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