I have a JLAudio RD400 (75w RMSx4) amp connected to 4 coaxial Audiofrog speakers (75 watt RMS recommended per speaker) and a JBL Basspro hub. The installer seems to have connected the front and rear speakers on the passenger side to one channel, and the same for the driver side, with the sub connected to the other two channels. Does this setup mean my amp isn’t powerful enough because of the way the sub is connected?
I’m also noticing white noise in the background. Would getting an amp with a higher RMS fix this problem? Any advice?
Your amp is 2-ohm stereo stable, so it sounds like the installer did it right.
Your passenger side and driver side are running at 2 ohms each, and your sub is bridged. If it’s a 4-ohm sub, then your speakers are getting about 75 watts each because they are 4-ohm speakers. Your sub is combining two channels to give a 4-ohm load when bridged, delivering around 150 watts to the sub.
Quin said:
What exactly does this ‘white noise’ sound like?
It’s like a faint static sound that gets noticeable when the volume is above 60%. What’s weird is the passenger side is about four times louder than the driver side. It’s a bit annoying when music is playing. I might sand the paint around the ground connection on the chassis tomorrow—it looks like there’s still some paint there. Hoping it helps.
@Bex
That static would drive me crazy too. With how good JL amps are, you shouldn’t have that issue if everything’s set up properly.
It could be a problem with the signal cables (RCAs). Are you using an aftermarket head unit or a line converter? There might be a loose connection, a pinched cable, or something else worth checking out. If the install is still under warranty, I’d recommend taking it back for a review.
@Bex
The Fix 86 is a line output converter (LOC). It could be the source of the problem, or maybe the cables going to the amp. It’s worth having someone check the setup and make sure all the connections are tight and configured correctly.
@Bex
What you’re describing might be floor noise. Sometimes it’s hard to eliminate completely, but I’d start by checking how the gain is set on your amp.