whine with acceleration??

[PSYKO PHOENIX]

hey all! this problem dosent bother me but i am keen to figure out why its happening, and how to fix it when/if i get sick of it

ive recently done a full car audio install

heres the list:
sony head unit (250 watt)
jvc 6" speakers (front)
pioneer 6x9's (rear)
sony xplode 12"sub (boot)
2x 600watt amps (1450 watts inc the head unit)
1 farad capacator
and a distrabution block to spread the power arround

THE PROBLEM:

when i press the accelerator the system whines, its like a wistle and it increces as the revs come up, when the sounds are up loud you cant hear it but when there on low volume you can.

i was wondering whats causing this? how do i fix it?

cheers

[ScoHar]

most people will say sound suppressor, but I still say your alternator, I bet if you change it you will notice all your problems going away, the voltage regulator on them craps out and starts giving you funny problems before the bat light on the dash stays on.

Does the bat light on the dash ever come on?

Also generally earth problems can cause whining in stereo gear

[HoldrodeoLT]

hey all! this problem dosent bother me but i am keen to figure out why its happening, and how to fix it when/if i get sick of it

ive recently done a full car audio install

heres the list:
sony head unit (250 watt)
jvc 6" speakers (front)
pioneer 6x9's (rear)
sony xplode 12"sub (boot)
2x 600watt amps (1450 watts inc the head unit)
1 farad capacator
and a distrabution block to spread the power arround

THE PROBLEM:

when i press the accelerator the system whines, its like a wistle and it increces as the revs come up, when the sounds are up loud you cant hear it but when there on low volume you can.

i was wondering whats causing this? how do i fix it?

cheers

Doesnt this normally happen when the RCA cables are to close to the power line??

[PSYKO PHOENIX]

nope, only when i turn the key to acc

i installed a volt meter last night, it sits at 14volts when the car is running

[PSYKO PHOENIX]

Doesnt this normally happen when the RCA cables are to close to the power line??

not sure, the rca's and power cable run down seprate sids of the car, or do you mean the head unit power cable?

[holdenboy]

Where have you earthed off the amplifiers, and did you srcap/sand back the area to bare metal?

[PSYKO PHOENIX]

the amps are earthed on the roof of the boot, kind of inbetween and slightly behing the amps, both are arthd to one point, and yup i sanded back to bare metal

[ScoHar]

i would suggest starting by moving the earth to the floor of the boot, worth a try, the parcel tray should be fine but try the floor cheap and easy to try

[ari666]

i fixed that problem once by running an earth wire direct to the battery. its a pain in the bum but it works.

sound supressors just kill the signal going to the amp so that it isnt as obvious, but it is still there.

[Timmos]

"Engine whine" can be cause by lots of things.


Faulty or cheap RCA's - Go get some shielded RCA cables. They're a bit more expensive but worth it in my opinion.

Faulty Amp - This is only something you can check if you have or know somebody with a spare amp.

Poor grounding - possibly upgrade the power and earth cable size, start by moving the ground cable to a different (more solid) location. Make sure to remove any paint around the ground bolt.

Crossing RCA's and Power cables will cause noise

Some headunits produce a small amount of whine, try grabbing a bit of speaker wire and touch the chassis of the HU and ground it.

Short in speaker wire - Do you notice the noise being in 1 speaker noticably louder than others, or does 1 speaker occasionally cut out? good chance there's a short. Try disconnecting each speaker from the amp 1 by 1. (personal experience i found both my backdoor speakers were causing noise in my system)

[ScoHar]

forgot to also mention checking your engine earth straps.

[PSYKO PHOENIX]

update, this might help find out whats causing it, or not hahaha

on the weekend i did dome work on the ground of the car, i removed the old neg termanal and replaced it with a gold one, put a bigger gauge wire from the neg to the chasis and gave everything a bloody good clean, it worked wonders for my gauges, which were earthd were the stereo was earthd, i re wired the gauges directly to the neg termanal on the new gold bracket (it has 2 holes on it for 18 gauge wire, prseumibly for sterio or accessory grounding) and while i was at it i gave the ground for the stereo another bolldy good clean, filed the metal where it grounds to and the loop that it grounds with, it was nice ans shiney and clean.

however now the noise is worse! its gotten louder, and is more noticable, it was anoying befor but no big deal, not its horrible

im open to any and all suggesgions

i was thinking about grounding direct to the neg termanal (like the gauges) would that stop the whine??

[danja]

+1 for crappy earth at the amplifiers. Is your ground wiring the same gauge as your power wiring?

[PSYKO PHOENIX]

not sure, i think so, when i put in the new HU i just wired the ground to the existing ground and the power to the existing power

[PSYKO PHOENIX]

so you reckon one wire to ground the hu and then run another one to the bat to ground the amps?

[holdenboy]

The head-unit ground shouldnt be a big issue, so long as youve bolted/screwed the head-unit in using the standard brackets? If so the head-unit will earth through its chassis and to the mounting brackets etc.

Re-do the earths at the amplifiers. If what you mean by the roof of the boot the underside of the parcel tray then that isnt a good place. A good place is the seat belt bolts for the rear seat, they are nice and chunky to get a solid connection.

Running a dedicated earth wire from the negative battery terminal isnt needed for both youre amps or head-unit.

[VQXTC]

What sort of amplifiers are they?

cheers

Simon

[PSYKO PHOENIX]

there vibrant 415 600 watt

last night i moved all but one earth, iv moved the capacator earth to the towing brace the HU to the batt (it was easy to do, and atleast ive eliminated it lol) and the amp that does my 4 speakers inside the car is now earthd to one of the bolts that holds the center seat (tray thingy) in place, i couldnt get to the seatbelt thing, the amp for the sub is still hooked up to the parcle tray but ill move that soon 2, ill prob run it to the other bolt

are these places any good or should i move them?

the whine is far less than it was the other day but its still there

edit: just thought id ad, there is no noise or problem when the system is turned off, it only starts up when i turn on the HU (which turns everything else on) dont know if this means anythining, but the more you know the better i spose

[VQXTC]

Cool thanx for that.... ok here is something you may want to try.... if you have a spare set of rca's run them straight from the H/U to the amp and see if you still have noise..... Make sure you disconnect your existing rca's. Remember this is just a test to see if its a signal issue.... Try this and let me know if it makes any difference....
Oh by the way do you have a multimeter?

cheers

Simon

[PSYKO PHOENIX]

ill give it a go soon, prob on the weekend

yup i do have a multimeter, its cheep and nasty but it works

[vr93]

i had the same problem in my vr it was the earth rnn 2 earths from the amp and that should stop in.

[PSYKO PHOENIX]

i havnt had a chance to do anything just yet however we went up to auckland this weekend and the noise was horrible!!

however, sometimes when id hit a bump in the road the volume of the whine would drop drematicly, its weird, hard to describe but it wasnt at a constnt level, hope you know what i mean