AudioBahn A18001DJ ユーザーズマニュアル

ADJUSTING AND TUNING

15

Below you will find information on adjusting the amplifiers gains.  Adjusting the gain correctly is essential to 

proper operation of the amplifier. 

.  The gain on 

an amplifier is not a volume control.  It is a signal level setting that tells the amplifier how strong of a signal 

is coming from the head unit.  Your amplifier has an input sensitivity of 200mV-8V.  The minimum setting is 

8V and the maximum setting is 200mV.  Minimum meaning the head unit or processor has 8V output and the 

maximum meaning it has a 200mV output.

When using 

Low-Level (RCA) inputs you MUST know what the pre-out or line-out voltage of your head 

unit is rated in Volts.  This is not the wattage rating.  This can be found in the manual of the head unit or by 

contacting the manufacturer.  If you are using a line-driver or another type of processor that adjusts the output 

voltage of the signal to the amplifier you will need to know what the output is adjusted to.  The gain on the 

amplifier needs to be set proportionately to the pre-out or line-out voltage rating of the head unit or processor.

If the signal strength is 4V then the gain would be adjusted to about 45 - 50%.  Below is a list of commonly 

found voltage ratings and their appropriate gain adjustments.  When adjusting the gain you want to start with 

the bass boost setting on the amp set to minimum and bass adjustments on the head unit or processor are 

set at 0 or flat.  As these other settings for bass adjustments are increased, the gain setting will need to be 

adjusted lower.

2V ≥ 70%

4V ≥ 45%

5V ≥ 32.%

8V ≥ 5% (Bass boost must be left at minimum on the amp and 0 or flat on the head unit or processor)

10V ≥ Can not be used with this amplifier.

If your amplifier includes 

Hi-Level (speaker wire) inputs and you are using them for the audio signal connec-

tion, please use the below steps to adjust the amplifier.  Start with a song with good bass that you know very 

well.

1.  

Use a screwdriver to turn GAIN (8V / 0.2V fully counter clockwise to 8V

2. 

Turn the auto sound system’s volume control to about 3/4 of its full range.  Any higher normally 

 

leads to the signal being distorted.

3. 

Turn up the amplifiers gain / level control unit the sound begins to distort, then immediately gain / 

 

level down to a point just before where the distortion began.

4. 

Adjust the auto sound system’s volume control to a comfortable listening level and you are good to 

 go.

NOTE:  The steps to adjusting the gain / level control need to be repeated when you adjust any bass boost 

setting on the amplifier, processors or significantly on the head unit.  Adjusting bass boost settings signifi-

cantly without adjusting the gain / level can lead to a distorted signal and damage to the amp and speakers.