Not exactly sure what you have going on but it very possibly could be engine noise.

 

Just make sure you find a good solid metal spot wherever you decide and putting the ground. And definately make sure to scrape away the stock sound deadener before grounding if you decide to do so. It will melt and then spark and then you could be looking at worlds of trouble. What also might help is upgrading your ground wire from the battery to the chassis. I also have begun to experience this noise problem and with 10 seperate speakers it is really obnoxious at low volumes. For mounting the cross overs there are a couple ways to go. Behind the stock door panel down to the right on the new subaru's there is a big space with a lot of styrofoam. YOu can remove the foam and that will give you a little cavity in which you can cover up a X-over mounted to the door. You can use backstrapping to mount it or what might be easier is just run another wire back to amp and mount the X-overs back there. Good Luck!

 

To mount the tweeters in the door secure the tweeters to some backstrapping and then secure the back strapping to the door with silicone

 

rule of thumb........ your ground wire should always be twice as big as your pos wire or at least close to it (whatever guage you are using from the batt to the amp make sure your ground is bigger) ......... i have an 8 guage pos wire and a 4 guage ground wire never had a prob. with car noise...... try that.... it might help. remember your ground completes the circuit of power to your amp and if the ground is limited then so will your juice to the amp.

 

make sure you are not running your RCA's and power wire down the same side of the car. Also if the power and signal cross anywhere in your install make sure it is at a 90 degree angle "+"...
nate

 

sounds possible...is the noise there when the car idles?

 

are your RCA's shielded?

 

The more little extra gimmicks that you add will just make it worse with more current...just go and get some good RCA's

 

Ok man here's the deal. I'm a stereo installer so I hope this helps. Your first big problem is the fact that you haven't invested in an aftermarket headunit yet. A cheap alpine unit like the 9801 has a sub leve control built right into it and there is no need to convert to rca's. Second, ignore what the guy told you about needing a bigger ground than power wire. Always match sizes. Same current in and out. Third, I imagine that you are using a bazooka tube or something similar. In that aspect there could be your total problem. With car stereo, especially amplifiers, the better the amp the better the sound and less the problems. If you buy good name brand equipment you won't have nearly the problems that you have with cheap crap. I have seen sony amps buzz and squeal like yours but slap in a JL amp and all is well with the world. As for making a better ground, just make sure that you scrape all the paint away from the metal surface with a wire brush and make sure you use a solid piece of the car like the trunk floor (always pay attention to fuel lines before drilling). If you have a voltmeter and measure ohms then your ground should be less than .5 for optimal grounding. As for alternator whine in general...it is one of the hardest things to troubleshoot. I recommend that you pick up a new amp and sub and stay away from all in one combos. But if you must, check the path that your rca's run and make sure they are not running past a fuse box or other part that could cause a lot of elctronic interference. Oh and if you want to try ground loop isolators again, get ones you can ground. That might help.

Good Luck