AB243R/AB243RG
When this unit is turned on, starting and stopping the engine of a car with its volume raised 
to the maximum level may harm your hearing. 
Be careful about adjusting the volume.
Turning on the power and adjusting 
the volume
1) Press the POWER button 5.
*
To  turn the power on and off, press the POWER 
button.
2) Tur ning the Rotary knob 3 clockwise
increases the volume; turning it counterclockwise decreases the volume.
*
The volume level is from 0 (minimum) to 33 (maximum).
Setting the Z-enhancer
This unit comes with 3 types of sound tone 
effects stored in memory. Select the one you 
prefer.
*
The factory default setting is “OFF”. 
Each time you press Z-EHCR button 
7, the tone
effect changes in the following order:
“Z-EHCR 1” ➜ “Z-EHCR 2” ➜ “Z-EHCR 3” ➜ 
“OFF” ➜ “Z-EHCR 1”...
• Z-EHCR 1 : bass emphasized
• Z-EHCR 2 : treble emphasized
• Z-EHCR 3 : bass and treble emphasized
• OFF : no sound effect
Adjusting the tone
Press A-M button 4 and select the item to 
adjust. Each time you press A-M button 4, the 
item changes in the following order:
“BASS 0” ➜ “TREB 0” ➜ “BAL 0” ➜ “FAD 0” 
➜ Function mode...
Adjusting the bass 
1. Press A-M button 4 and select “BASS”.
2. Tu rning the Rotary knob 3 clockwise
emphasizes the bass; turning it counterclockwise attenuates the bass.
*
The factory default setting is “0”. (Adjustment 
range: –6 to +6)
3. When the adjustment is complete, press A-M
button 4 several times until the function 
mode is reached.
Adjusting the treble 
1. Press A-M button 4 and select “TREB”.
2. Tu rning the Rotary knob 3 clockwise
emphasizes the treble; turning it counterclockwise attenuates the treble.
*
The factory default setting is “0”. (Adjustment 
range: –6 to +6)
3. When the adjustment is complete, press A-M
button 4 several times until the function 
mode is reached.
Adjusting the balance
1. Press A-M button 4 and select “BAL”.
2. Tu rning the Rotary knob 3 clockwise
emphasizes the sound from the right speaker; turning it counterclockwise emphasizes 
the sound from the left speaker.
*
The factory default setting is “0”. (Adjustment 
range: L9 to R9)
3. When the adjustment is complete, press A-M
button 4 several times until the function 
mode is reached.
Adjusting the fader
1. Press A-M button 4 and select “FAD ”.
2. Tu rning the Rotary knob 3 clockwise
emphasizes the sound from the front speakers; turning it counterclockwise emphasizes 
the sound from the rear speakers.
*
The factory default setting is “0”. (Adjustment 
range: F9 to R9)
3. When the adjustment is complete, press A-M
button 4 several times until the function 
mode is reached.
6
English
5. OPERATION
Basic Operations
Note: Be sure to read this chapter by referring to the front diagrams
in chapter 2. CONTROLS on page 3 (unfold).
CAUTION