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Manual-2

FRONT PANEL: STEREO 2-WAY CONFIGURATION

Observe the labels 

above 

the controls for stereo operation.

*

 Not used in 2-Channel 2-Way Mode

 Channel 1 MASTER LEVEL control:

 Sets the overall Level of Channel 1 without altering the relative settings of the Low

and High frequency Outputs. Unity gain for all level controls is at “7”.

 LOW LEVEL control: 

Sets the Level of signal going to the Low Frequency output in this channel. Refer to ‘Setting the

Output Level Controls’ on page Manual-15.

 LOW MUTE switch:

 When pressed to the 

in 

position, all signal is removed from the Low Frequency Output. This eases

tune-up procedures as described on pages Manual-11-16.

 LOW DELAY control: 

Adds from 0 to 2 ms of time Delay to the Low Frequency Output only. This allows a low fre-

quency driver to be electronically phase-aligned with a mid frequency driver whose diaphragm is situated 

behind 

the low

frequency diaphragm. Refer to ‘Time Delay Adjustment Procedure’ on page Manual-10.

 LOW/HIGH crossover frequency selector

: This 41-detent selector sets the crossover frequency between the Low and

High frequency Outputs. Refer to ‘Selecting Crossover Frequencies’ on page Manual-10.

 HIGH LEVEL control:

 Sets the Level of signal going to the High frequency Output only.

 Channel 2 MASTER LEVEL control: 

Sets the overall Level of Channel 2 without altering the relative settings of the Low

and High Outputs.

 

POWER switch and indicator: 

Two guesses.

 

When this yellow LED is lit, you guessed right — the unit is on and ready.

MONO 4W OR 5W: INACTIVE

MID

MONO MASTER

SUBWOOFER

SUB / LOW

HIGH

LOW

LOW / MID

4W: MID / HIGH

5W: MID / HIGH-MID

4W: INACTIVE

5W: HIGH-MID / HIGH

4W: INACTIVE

5W: HIGH-MID

10

0

2

4

8

6

10

0

2

4

8

6

10

0

2

4

8

6

10

0

2

4

8

6

10

0

2

4

8

6

10

0

2

4

8

6

10

0

2

4

8

6

10

0

2

4

8

6

MAX

MIN

2

4

8

6

MAX

MIN

2

4

8

6

MAX

MIN

2

4

8

6

MAX

MIN

2

4

8

6

100

80

1k

900

850

150

200

240

750

600

400

190

250

7.0k

5.8k

550
475
350

700

2.0k
2.8k
4.5k

1.0k

190

250

7k

5.8k

550
475
350

700

2.0k
2.8k
4.5k

1.0k

100

80

1k

900

850

150

200

240

750

600

400

3W: MID / HIGH

2W: LOW / HIGH

3W: LOW / MID

2W: INACTIVE

2W: INACTIVE

3W: MID / HIGH

2W: LOW / HIGH

3W: LOW / MID

2W: INACTIVE

2W: INACTIVE

2W: LOW

ACTIVE

CROSSOVER

70

70

2W: LOW

LEVEL

LEVEL

MUTE

LEVEL

LEVEL

MUTE

FREQUENCY

DELAY

DELAY

LEVEL

FREQUENCY

FREQUENCY

LEVEL

DELAY

MUTE

FREQUENCY

LEVEL

DELAY

MUTE

LEVEL

AC 23B

CH 2

MASTER

CH 1

MASTER

POWER

FREQUENCY

LOW

MID

LOW

MID

HIGH

HIGH

1

2

3

4

5

5

6

6

8

7

2

3

4

*

*

Stereo 2-Way labels in this row.

Summary of Contents for AC 23B

Page 1: ...it remains Pity See page Manual 6 for Mono 4 Way configuration In agreement with IEC and AES ANSI standards AC 22B wiring convention is pin 2 Positive pin 3 Negative return pin 1 chassis ground See t...

Page 2: ...ng Crossover Frequencies on page Manual 10 HIGH LEVEL control Sets the Level of signal going to the High frequency Output only Channel 2 MASTER LEVEL control Sets the overall Level of Channel 2 withou...

Page 3: ...still active and may be used as additional subwoofer outputs STEREO MONO switch Set this switch to the STEREO out position POWER input connector Use only a model RS 1 or other power supply approved by...

Page 4: ...MUTE switch Removes all signal from the Mid Frequency Output when pressed to the in position MID DELAY control Adds from 0 to 2 ms of time Delay to this Channel s Mid Output MID HIGH crossover frequen...

Page 5: ...equency amp and the CHANNEL 2 HIGH OUT to the right channel input of the high frequency amp MID OUTPUTS Connect the CHANNEL 1 MID OUT to the left channel of the mid frequency amp and the CHANNEL 2 MID...

Page 6: ...the Mid and High Mid Outputs NOTE Both the CHANNEL 1 HIGH LEVEL control and CHANNEL 2 MASTER LEVEL control are automatically bypassed when the AC 23B is switched to MONO on the back panel Adjusting th...

Page 7: ...turned off Remove the top cover of the AC 23B 2 Locate the 4 WAY 5 WAY switch see diagram 3 Move the switch from the 5 WAY position to 4 WAY 4 Replace the cover The AC 23B is now set for Mono 4 Way M...

Page 8: ...o the input of the subwoofer or bass bin amplifier LOW OUTPUT Connect the LOW OUT to the input of the low frequency mid bass amp MID OUTPUT Connect the MID OUT to the input of the mid frequency amplif...

Page 9: ...een Channels HlGH OUTPUT Connect the HIGH OUT to the input of the high frequency amplifier STEREO MONO switch Be sure this switch is in the STEREO out position Yes STEREO A Mono circuit is created whe...

Page 10: ...first into the realm of time delay and how to adjust it it might help to spend a moment here to re affirm why on earth this delay is really necessary For a short course on time delay Linkwitz Riley a...

Page 11: ...id driver at a comfortable volume 3 With a healthy but not uncomfortable volume of noise from the mid driver set the analyzer DISPLAY LEVEL control so the LED s corresponding to the high crossover fre...

Page 12: ...ophone until it is vertically midway between the mid and low drivers Repeat steps 2 through 5 using the crossover LEVEL control MUTE switch and next DELAY control You may start each series of steps 2...

Page 13: ...ill do not obtain a 3 dB reading you will have to physically move the high driver farther forward until the SPL meter reads 3 dB The amount of displacement corrections available from the delay depends...

Page 14: ...knob setting will then be the closest for your system For example if you have a two way system crossed over at 800 Hz with the compression driver voice coil located about 9 behind the woofer voice coi...

Page 15: ...d methods of setting the crossover output Levels Setting Levels Using a Realtime Analyzer NOTE If you are running two Channels tune up only one Channel at a time 1 Set all LEVEL controls on the crosso...

Page 16: ...se 1 Run pink noise into the crossover Inputs through the mixer or directly as is convenient 2 Make sure all crossover output LEVEL controls are turned all the way down and all amplifier level control...

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