SingRX8

Hi,

Wanna check with you guys experience any of the mentioned sound after doing up ur audio system?

I did up my system last week, after that I notice that whenever I rev' above 3~4K, I start to hear a 'whistling' sound coming from the speakers . Can any experts here help me out?

My system consists of the following;

PG Octane-R 8.0.4 (4 channel)
PG Octane-R 2.5.2 (2 channel)
Focal Polyglass 165v2 (front)
PG 6.5" (rear)
2 10" PG Titanium subs.
1.5 farad Cap.

Basic as it may be, but I really hope I can get the best outta my system.

Thanks,

dmp

Ground-loop....Check and secure the grounds to your amp - also make sure to keep signal wires well-shielded from power wires.

lurch519

What it sounds like is a case of the ground loop blues.

I am assuming you are using the factory head unit?

What advice i can give you from what you already have said is this.

First and foremost, use the best rca cables you can afford. General rule of thumb in home audio systems is that you spend between 15 and 25 percent of your budget on cables. That means that if you buy a home theater system that costs you $2000, you spend between $300 and $500 on rca's and such. Just because its in your car doesnt mean you skimp on your wiring.

The noise is most likely caused by a ground loop, which happens when there is a difference between the resistance on the ground wires at your amps, head units, and any other items you may have incorporated in your signal path (anything that has your rca's connected to it, ie, head unit, sound processor, amplifier). The BEST solution is to run all of your ground wires to the same point in the vehicle, for example the negative battery post. This is not always the easiest option, so using another ground point will work as well.

For grounding to anywhere than to your battery, you want to use a factory body bolt, (ie, seat bolt, body bolt as long as something doesnt fall off when you remove) and to make sure that you have good metal to metal contact between your ground connector and the body of the vehicle. Scrape, sand, wire brush, etc the paint from where the connection is going to be made.

Do not use a stinger or self tapping screw!! First, this results in a very bad ground, can work loose, and just be a general pain in the butt. Second, you might end up putting a screw through your gas tank, fuel line, vehicle wiring harness, brake line, etc. This would be VERY bad. I worked for 6 years in car audio, and I have seen this happen at least a dozen times because someone wasnt paying attention, or trying to take a short cut.

If making sure your ground is as good as possible, try moving the ground to different locations. Also make sure that your ground wire is the same gauge as your power wire. For example do not use 8 gauge ground from your amp if you are using 4 gauge power wire.

Let me know how this works out for you.

chuck

SingRX8

Thks guys, but seriously, I'm an idiot when it comes to this. Thot it's a simple process whereby I can rid the sound. Now it seems I have to bring it to the audio shops to have the guys take a look.

Eniwae, besides this sound thingy, I'm not very satisfied with the sound it produces. Consulted my friend and he advised to either change my front speakers from Focal to Rainbow (kickbass series). Add a sound processor, and remove 1 sub (meaning, use only 1 10" sub) and re-custom another sub box (abt S$2.6K) or simply change a head unit with RCA outputs (Pioneer DEH-P9 - S$900).

So can some experts here advise which would be a better option? I would like my system to sound clean and clear, not much of a bass freak tho'.

Rotary Rasp

iTrader: (2)

I have the same noise coming out of my stock bose speakers. I added a sub and amp, but the noise isn't coming from there. Any ideas?

Kel Rx8

feedback
i will try to take a pix of a filter i have which clears up the whistle noise.

radioshack sell them for cheap.

Rotary Rasp

iTrader: (2)

I assume you're talking about a ground loop isolator?

XeRo

WHAT!?...are you serious dude!!! something is definitely setup wrong if you aren't getting clean sound out of your Focal's...

SingRX8

Hi Xero, like wat i said, i really dunno abt the setup. Recently juz got my installer to lower the bass, it was causing me heahaches when i listen to fast tracks. The bass seems too much, but now that he lowered, it seems that I cun feel any bass w/o turning up the volume up (10~12). Sharkz, wat m i getting myself into? Paid close to S$4K and not getting any better...sigh!

RX4life

Ground.