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Quick Amp Question

jnr_j

By jnr_j,
in Car Audio & Electrical

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jnr_j Community Regular

jnr_j

Posted
Posted

Just installed an amp and I'm having amplifier engine noise problems. I've done searches and will try and figure it out but I was just wanting to confirm which side of the vehicle is best for running the RCAs?

I've got them down the passenger side at the moment (cleverly running right past the ECU!), is this the best way?

Also, I've got nice heavy 4GA power/ground lines on the amp, do I need to mess with the wiring on the pioneer head unit? (I'm thinking not?)

Car is a 33 gtst.

Cheers,

John

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Jay95R33 Grand Master

Jay95R33

Posted
Posted

G'day John,

Damn these R33 GTS't are so bad for engine whine :) I've got the same problem....

I reduced mine by running the RCA's as far away from any power source as I could. For me that meant running the RCA's up the middle of the car. Not sure if this is the best but......

I also put a power filter on the head uint which didn't do much, so it must be getting into the low level stuff feeding the amp.

I also found that if you earth everthing really well it seems to help reduce the whine.

Anyone else had much luck ??

J

jnr_j Community Regular

jnr_j

Posted
  • Author
Posted
I ran mine down the passenger side, have had no problems. Where did you mount the amp and where did you ground it to ?

At the moment the amp is just screwed into the base shelf of the boot (carpeted MDF). It's grounded (4GA) at the same point the battery is grounded, and the power (4GA) comes straight from the battery terminal via a fuse.

davidl Collaborator

davidl

Posted
Posted

Don't ground it to the same one as the battery. This can cause problems, also what brand amp are you using? some of the cheaper kind and really bad for nosie. A friend of mine had a cheap amp with a really bad whine through it, then he upgraded to a decent amp, noise gone, and we didn't change the wiring at all.

jnr_j Community Regular

jnr_j

Posted
  • Author
Posted

I'll try moving the ground and see what happens.

The amp is one of those Jaycar AA-4035 4x100W rms amps (being discontinued and on sale at the moment for anyone who's interested). A cheap amp compared to some brands but they're supposed to be ok as far as I know...

Anyone else out there with one of these amps who's not having problems and can let me know how they've wired it up?

abcent Mentor

abcent

Posted
Posted

i just recently did an instal (which amp for my 2x 12"subs post). Mine sounds awsome, no whining noise what so ever,and HUGE bass & clarity, I'm running Rockford Fosgate head unit, earthquake 6" splits front Via old Sony EMX700 2 channel amp(soon to be upgraded to Soundstream RUB 300-2), rear stockie clarion paper cones running off head unit, and 2 x 12" orion subs off a Soundstream RUB500-2 2 channel amp. Both amps are in the boot right next to the battery, RCA leads I ran down both sides of the car, passenger side for front splits amp and drivers side for sub amp. remote wire for both amps down passager side, LH split speaker wire down passanger side to amp, RH split speaker wire down drivers side to amp. Earth to car body, power through fuse then to a slit block to provide power to both amps.

May or maynot be worth mentioning that my R33 came with a top quality earthing kit throughout the car, wheather or not this makes a diference or not im not sure?

jnr_j Community Regular

jnr_j

Posted
  • Author
Posted

Seems to have sorted itself out, I just cable tied the rcas and moved things around a bit and I can't hear it anymore.

I've not had car sound running off a seperate amp before, speakers sound amazing. The amp in the Pioneer 6450 headunit was apparently really really bad at any kind of volume, and had me wondering about my shiny new JL audio 6x9s. (The inbuilt amp in my old bottom of the line sony head unit seemed to pump out much cleaner power than the pioneer)

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