Bazooka MGA4150 manual Adjusting the X-OVER and Bass, Fine Tune the System

ADJUSTING THE X-OVER AND BASS

Select the source input
2 CH. BASS = 2 channel input with bass boost on front and rear channels
2 CH = 2 channel input with bass boost on the front channel	Select the operation mode for the
4 CH = 4 channel input with bass boost on front channels only
	front and rear channels

ENGLISH

You can add up to 16dB of bass boost		BASS
by adjusting the Bass Boost control.
		BOOST
		0
		dB
		16
		FRONT
FREQ Hz		HIGH
	110
55		LOW
	240
600
	330

	2 CH. BASS	STEREO FRONT	POWER
	2 CH.	BRIDGED (F R IN)
	4 CH.	L+R MONO
			REAR
SOURCE		REAR	L+R MONO
		FREQ RANGE	BRIDGED (F L IN)
	FREQ Hz	X 1	STEREO
		X 10	HIGH
FULL	110
			FULL
	55	LOW
		240
	600
	330

Select the crossover	Select the crossover		Select the crossover type for the
	point for your rear speakers.		rear speakers
point for your front speakers.
Select the crossover type for the		X-over Frequency Multiplier
front speakers		Out = X1 (55Hz - 600Hz)

In = X10 (550Hz - 6Khz)

FINE TUNE THE SYSTEM

Fine tune the amplifier's input sensitivity.

GAIN	T h e	g a i n	s e n s i t i v i t y c o n t r o l f o r	t h e	“ M G A ”
	amplifier is located on the side panel. This gain control
	has	been	included to allow adjustment	to	properly

match the output of the radio. This is one of the most

misunderstood adjustments. By rotating the control in the clockwise direction, the amplifier‘s input will become more sensitive and the music will play louder. This is

not a volume control and you will not get more power out of the amplifier in the maximum position! It may seem to deliver more output, but actually the system is only playing louder faster as you turn the volume control on the radio. Ideally, to properly level match the system the goal is to achieve maximum output from the amplifier without distortion at about 3/4 of the volume control.

To determine if the amplifier’s gain is set properly, turn the system on and slowly increase the volume control. You should be able to use about 3/4 volume before the system gets loud but not distorting. It is very important when making these adjustments that you do not over drive the speakers (at point of distortion) this will cause permanent damage to the speakers. If you are unable to achieve 3/4 volume before distortion you will need to adjust gain control (in this case you would reduce the gain). The gain controls should be adjusted very slowly. It may help to have another person to assist you by adjusting the gain controls while you listen for distortion.

10 MGA AMPLIFIERS