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swarb · 12-12-2015, 12:21 AM

So I installed the 4 channel x 45watt Alpine ktp-445a on my Brz a while back. I am powering the front door speakers at 45 watts.
Gain is turned about halfway so door speakers a louder than the dash speakers(sounds harsh/glaring).
With the volume at 0 on the head unit, it sounds like a fan is on. It is bothering me quite a bit.
I am using the factory wired ground.

How can I reduce the noise?
Should I make a chassis ground? Should I keep the wired ground connected also to have 2x the ground?
Filters?

Also, how do I turn off the head unit completely? I can turn off the screen, or turn off the input, but the head unit is still on and the noise is still there. Ideas?

12-12-2015, 12:21 AM	#1
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,052 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	How can I reduce noise from my signal? So I installed the 4 channel x 45watt Alpine ktp-445a on my Brz a while back. I am powering the front door speakers at 45 watts. Gain is turned about halfway so door speakers a louder than the dash speakers(sounds harsh/glaring). With the volume at 0 on the head unit, it sounds like a fan is on. It is bothering me quite a bit. I am using the factory wired ground. How can I reduce the noise? Should I make a chassis ground? Should I keep the wired ground connected also to have 2x the ground? Filters? Also, how do I turn off the head unit completely? I can turn off the screen, or turn off the input, but the head unit is still on and the noise is still there. Ideas?