Radio Frequency Interference
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=79681
Printed Date: April 29, 2024 at 5:33 AM
Topic: Radio Frequency Interference
Posted By: Stealthimage
Subject: Radio Frequency Interference
Date Posted: June 27, 2006 at 10:16 AM
What would be the main reasons why there is more radio frequency interference when I turn my sub amplifier on? I know that where I live there is bad reception to begin with, but when I turn my sub on it gets worse. I verified this with a station that doesn't come in too well to begin with. It's not a really big deal, but I would like to know what might cause this from an installation standpoint.
Replies:
Posted By: ld11
Date Posted: June 27, 2006 at 11:38 AM
I'll take a stab at this. Amplifiers for subwoofers are generally class D switching amplifiers. It uses pulse width modulation to create an amplified signal which passes through a low-pass filter to get a smoother signal.
The quick on-off switching creates excess high-frequency radio interference which may be affecting your radio.
Posted By: Stealthimage
Date Posted: June 27, 2006 at 2:43 PM
So what might be the cure for this, taking the switch off of the amp and wiring it with my four channel?
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