sound/subs

[veeteecommo]

hey just installed 2 kicker cvr subs off a 4 channell us audio amp...(yes i no the amps **** but im just borrowing it off a mate till i get some more cash)
anywho ive noticed a wierd noise coming from the subs that i cant really describe.
it can even be heard when the volume is on 0...and it looks as if the subs wanna pop out of the box.....
i know it cant be a grounding problem or a power problem cos a the amps light would go red and b the amp wouldnt even be powered at all...

just owndering of anyone can shed some insight as to what my problem may be...
or should i just go and get it professionally installed? if so by who?

[alien]

How have you wired up the two subs? Check this site for how it's suggested to wire them up for impedences:

http://www.crutchfield.com/S-iMLDCwn...rs_wiring.html

Also, what connections are being used on the amp? The RCA connections or the wired harness?

[cartoonwally]

Hey mate,

It is most likely interference / noise. The thing with a ground is it could be 'grounded' but not grounded well enough, so make sure your whole ground system is correctly setup (with the right specification of wire), including the wire from your battery (for ground). That'd be my first port of call. My second question is, are you running your signal leads with your power leads?

[rcnugget]

if you get a hushing static noise it is either a bad ground or crap RCA leads

a bad ground will still keep the power light on will just make your speakers sound like crap and not run near full power. The protection light is USUALLY only related to low/high ohms overheat and things like that .. not a bad ground

RCA noise is a funny one to track down, you have 2 options if this is the case ... relocate where the RCA's actually run to the amp or get double/tripple shielded cables ($$)

if the sound is related to engine revs then it could be many hundreds of things IE

dirty headunit power supply
bad power supply to amp
running RCA's with power wire
dodgy regulator
bad ground on HU/amp
bad ground to battery ( did you even upgrade this?)

anyway sounds like you needs to take it to someone who knows what they are doing, I would at least try a new ground for the amp AND MAKE SURE YOU CLEAN OFF THE PAINT!

The Kings guide to elimanating stereo noise.

[Luke0011]

ill guess that the us audio amp is fauty. i have seen many of ts
hemdo strange thing

[veeteecommo]

mmmmm im running an 8 gauge power kit......the rca's run right next to the power cord right under the door trim and then up to the amp....should i maybe change he the side the rca's are on?

or is it worth paying the money to get it professionally done?

[veeteecommo]

could it be because i didnt have my remote wire connnected properly?

[veeteecommo]

okaaay sooo not its not my remote wire.....i just fixed it...and its not revs relatedd anyone got any suggestions as to wherre the interference could be coming from?

[2LOUD2OLD]

you said earlier your rcas are running with your power, this is a big no no, run your rcas down the opposite side of the car

[alien]

Yea, that is your problem, the current in the power cables will cause current flow in the RCA cables. Physics in action Always keep signal cables away from power cables.

[veeteecommo]

looool sooo...the only question i have left is how do i run the rca cables along the otherside? being the drivers side i no how to run them along the flooor trims etc etc.....i just dont no how to go past the steering wheel and what not....
also is it possible that i can take off the back seat. i can take of the actual seat part easy but its the back rest part thats giving me trouble

[rcnugget]

take the seats out and run under the carpet if your cable is too fat to go under the trims, some people run underneath the car but this can be a bit touch and go if you dont know what you are doing

[alien]

RCAS are generally run down the passenger side in the door trims just like the drivers side. You will need to remove the trims or at least lift it a bit and pass the cable through holding onto the RCA heads if there's not enough room. Yellow Toungue is really easy to lay cables with!

[veeteecommo]

hahah so its easier to run the power cable along the driver side? i should have checked to see if the firewall on the drivers side was accessible...if i have one there? i no for now my power cable runs thru the passengers side firewalll i might just pull it back and run it thru the drivers side......?
althought my only problem was that i couldnt fit the power cable thru the firewall soo i just left it off and went around it.....
can any one help with suggestions?

[veeteecommo]

okaaaaay welll i re ran the rca on the otherside of the car opposite to the power cable side...and im still getting interference.....theres no way the two cables r touvhing eachother...however the rca cables run right next to the speaker cable wires for the parcel shelf speakers....
anyone got any final suggestions before i end up paying jb or auto barn to do it for me?

[2LOUD2OLD]

speaker wire wont cause interference it runs at too high a current
as for a solution now, youve got me :P

[kopper69]

speaker wire wont cause interference it runs at too high a current
as for a solution now, youve got me :P

Speaker wire doesnt 'run at too high a current'. Speaker signal has a higher voltage, lower current. Any changing voltage in a conductor can cause interference in another conductor given the conditions are right.

veeteecommo, the interference is either being caused by the amp or being fed into the amp and amplified. You can disconnect the input signal to the amp (RCA's) and see if the problem still exists. If it does the amp is picking up the interference. Just because the amp has power doesnt mean that it has a good power and ground connection.

[Luke0011]

Yea, that is your problem, the current in the power cables will cause current flow in the RCA cables. Physics in action Always keep signal cables away from power cables.

Completly incorrect statement yet again. YOu cant have current flow without a circuit. What you are getting is whats called an EMF which is electro magnetic field which can cause interference, especially with cheaper product. BUT THIS interference is constant which indicate to me that the problem is either in a crossover or more likely in the amplifier. or head unit

[veeteecommo]

i was thinking headunit.......soooo the question remains how can it be fixed?im going to buy a better amp..the one im using now was a mates old one!
ive run the rcas on the opposite side soo this interference is confusing meee!

[veeteecommo]

is it possible that the sound was becos the amp cant power both subs at the same time? me and mate decided we would swap amps with one he had lying round his house and you couldnt even turn up the volume without the amp cutting out and the overcurrent light flashing...it couldnt even power one sub by it self......

[jjFarking]

Bad grounding/connection(s).
Check the connections, to make sure no exposed wiring is touching anything metallic
You may want to add another/change the grounding you have at the moment.
Sometimes it's better to have grounding for a separate amp from a separate location (eg. grounding for sub-amp(s) in the boot, rather than from the front connection(s) - sometimes two are required, depending on how sensitive your equipment is).
Good luck

[Ph47VE]

I had the same problem, if its a rattling noise u have blown the voice coils because u ran the subs of such a crap amp.therefore if im correct there is no fixin them.

[Luke0011]

what head unit are you using. And you wouldnt get that low frequency hum from an amp that cant power the subs. Th eproblem is definatly in the amp or head unit. It is not a bad ground connection. But if you dont know what a good ground connection is then i would suggest getting a proffessional to help.
jj farking ,,,,, its always better to ground everything to the same point because different ground points have different ground references to the negative terminal of the battery. Having different ground references can increase the chances of interference and or feedback. But its not really a big concern.