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Rane AC 23 Operator's Manual
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Rane AC 23 Operator's Manual

Rane active crossover
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OPERATORS MANUAL

QUICK START

This is an automatic crossover! By automatic, we mean that the AC 23 is smart enough to know whether you want to
run it as a two channel crossover, or as a single channel unit. It knows by the way the plugs are inserted how your system is
to be configured. However, just because it is automatic, doesn't mean that it will not automatically confuse you when you
try to connect it in a bench test situation. Note: Labels above the controls refer to the unit being operated in the 2- or 3-
Way Stereo mode. Labels below the controls refer to the unit being operated in the 4- or 5-Way Mono mode.
Plugging a signal into the CHANNEL 1 INPUT and nothing into the CHANNEL 2 INPUT tells the unit that you are
running a single channel system in Mono 4- or 5-Way mode, and therefore sets the unit up to be a single channel device.
This can lead one to think that there are some dead channels in the unit when looking for output in places where there
shouldn't be any. The even more automatically confusing part is the way that the Output connectors decide whether the unit
is a 4-Way or 5-Way crossover. It is actually rather straightforward.
To test the unit as a Mono 4-Way, first slide the CHANNEL 1 and 2 switches on the back to 3-WAY. Connect the
INPUT source to CHANNEL 1 only. Following the labels below the jacks, look at SUB OUT, then look at LOW OUT,
now go back to MID OUT, and then proceed to the HIGH OUT. So far, so good.
To test the AC 23 as a Mono 5-Way, the only precaution required is there must be a "dummy" plug (¼" unconnected
plug) inserted into the HI MID OUT to program the crossover properly. When you reach the point where you want to
measure the output of the channel with the dummy in it, simply remove it and insert your test output plug in that location.
When operating the AC 23 as a Stereo 3-Way, follow the diagram on page Manual-5, reading the labels above the jacks
and controls. To drive both Channels with a mono signal, connect only to the CHANNEL 2 INPUT. This approach is the
same as if you used a wye cable to both Inputs.
The AC 23B is available as a fully balanced output version equipped with XLR connectors (for inputs and outputs)
instead of the ¼" jacks. If you are connecting to balanced amplifiers from the AC 23 or are running crossover output cable
lengths greater than 10 feet (or 3 meters), we highly recommmend you purchase an AC 23B.
Never connect anything except an RS 1 or other approved Rane AC power supply to the thing that looks like a
telephone jack on the rear. This is an 18 VAC center-tapped power unit. Consult the Rane factory for replacement or
substitution.

AC 23 CONNECTION

Balanced/Unbalanced Inputs

The ¼" Input jacks on the AC 23 are TRS (tip-ring-
sleeve). We recommend connecting the AC 23 with a bal-
anced cable from the balanced output of a mixer or equalizer.
If a balanced output is not available, and the cable run is
less than ten feet (three meters), inserting an unbalanced ¼"
TS (tip-sleeve) plug works in most situations.
WEAR PARTS: This product contains no wear parts.
ACTIVE CROSSOVER

Unbalanced Outputs

The ¼" Output jacks on the AC 23 are unbalanced TS
(tip-sleeve). We recommend that cables to the amplifiers be
no longer than ten feet (three meters).
See the "Sound System Interconnection" RaneNote
included with this manual for more information on cabling
and grounding requirements.
AC 23
Manual-1

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Summary of Contents for Rane AC 23

  • Page 1 QUICK START This is an automatic crossover! By automatic, we mean that the AC 23 is smart enough to know whether you want to run it as a two channel crossover, or as a single channel unit. It knows by the way the plugs are inserted how your system is to be configured.
  • Page 2 Observe the labels screened above the controls for stereo operation. NOTE: In the 2-Way mode, the AC 23 crossover range is from 190 Hz to 7 kHz. The model AC 22 crossover in stereo 2-Way mode is recommended when the crossover point needs to be outside of this range.
  • Page 3 2-WAY position. POWER input connector: Use only a model RS 1, or other remote AC power supply approved by Rane. This unit is supplied with a remote power supply suitable for connection to this input jack. This is an 18 VAC center tapped power supply.
  • Page 4 FRONT PANEL: STEREO 3-WAY CONFIGURATION Observe the labels screened above the controls for stereo operation. POWER switch: Two guesses. POWER indicator: When this yellow LED is lit, the unit is ready to operate. CHANNEL 1 MASTER LEVEL control: Sets the overall Level of Channel 1 without altering the relative settings of the Low/Mid/High frequency Outputs.
  • Page 5 3-WAY position. Power input connector: Use only a model RS 1 or other power supply approved by Rane. This unit is supplied with an 18 VAC center tapped remote power supply suitable for connection to this input jack. Consult the factory for a replacement or subsitution.
  • Page 6 FRONT PANEL: MONO 4-WAY AND 5-WAY CONFIGURATION Observe the labels screened below the controls for mono operation. POWER switch: Two guesses. POWER indicator: When this yellow LED is lit, the unit is ready to operate. MASTER LEVEL control: Sets the overall Level of the entire unit in Mono mode, without changing relative settings of the individual Sub/Low/Mid/High Outputs.
  • Page 7 Hl MID LEVEL control: This controls the Level of signal going to the Hi Mid Output only in 5-Way Mode. **NOTE TO 4-WAY MONO USERS: An internal jumper determines 4 or 5-Way mode. Our apologies: We must ship the units in the 5-Way mode since normal Stereo 3-Way operation demands it: a fact not the least bit obvious, but nevertheless, a fact it remains.
  • Page 8 Hl MID FREQUENCY OUTPUT (FOR MONO 5-WAY ONLY): Use this output only for Mono 5-Way applications. Omit this output when using the AC 23 as a Mono 4-Way Crossover. As long as no plug is inserted into this jack the AC 23 internally bypasses the Hi Mid section and defeats all front panel Hi Mid Controls.
  • Page 9 3-WAY, and the CHANNEL 2 switch to 2-WAY. Power input connector: Use only a model RS 1 or other power supply approved by Rane. This unit is supplied with an 18 VAC center tapped remote power supply suitable for connection to this input jack. Consult Rane for a replacement or substitution.
  • Page 10 Fine. So we put up with it. But to make matters worse, 1. The AC 23 possesses 24 dB/octave roll-off, so the when two drivers are horizontally displaced—that is, one is in crossover points may be set to the nearest detent above the front of or behind the other, this “lobe”...
  • Page 11 MID DELAY control at minimum. time delay. Some references will be made to the Rane RA 27 realtime analyzer for those with the intelligence and good ii.If the display shows less than +3 dB reading (still in taste to use one regularly.
  • Page 12 The Turning the delay control up causes the lower frequency built-in delay system in the AC 23 is designed to driver to electronically move backward until the SPL meter accommodate the majority of common speaker reads +3 dB;...
  • Page 13 The built-in delay system in the AC 23 is designed to accommodate the majority of common speaker configurations; if you encounter confusion or difficulty with your particular system, it is best to consult your dealer or the Rane factory for assistance.
  • Page 14 Delay vs. Frequency Table In order to phase-align two drivers you must observe only the crossover frequency, which is common to both drivers. If you do not have the equipment necessary to electroni- cally align the system as described in previous sections, you Pink noise can be used if all other frequencies are disre- may use the table below to obtain a rough and approximate garded, since room acoustics and imperfect driver response...
  • Page 15 Turn all amplifier (ala Rane RA 27), adjust all of the crossover outputs so that controls at least half way up. the system is as flat as possible. Once the system is tuned, the crossover is then locked behind a security cover (posted guard 4.
  • Page 16 Meter & Pink Noise Generator the system. When this happens, re-set the SPL meter so that The MUTE switches on the AC 23 make using an SPL it reads 0 dB on this frequency section (you may have to meter an easy and relatively accurate means of tuning a “down range”...
  • Page 17 (see Fig. 5). If you are using CD horns, you should Frequency Output also read the CD horn EQ modification as described on page 18.With the AC 23 it is a little difficult to figure out which CHANNEL ONE: Delay to move to the High Frequency Output. The normal 1.
  • Page 18 The Low Frequency Outputs are now summed. 2.7 kHz .0022 µf 3.3 kHz .0018 µf 4.0 kHz .0015 µf 5.0 kHz .0012 µf 6.0 kHz .001 µf ©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com Manual-18 103042...

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