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pioneer headunit noise - Page 2

post #11 of 17
Quote:
Originally Posted by sccr64472 View Post

Not poking fun, but this is absolutely backwards. A high signal to noise ratio means that the waveform is more accurately reproduced. The higher the number, the better the source reproduction.

oh sorry.. i wrote it too fast. but you know what i meant. i am doing some testing. when i wrote that..i knew it was wrong. was too lazy to change it. and yes. i was lazy. you have the right to poke fun at me tongue.gif
post #12 of 17
Thread Starter 
The noise gets louder with the volume not with the car reving higher and its like a white nosie/hiss sound. Still I cannot understand why this is happening to this stereo and not cheaper plus the fact I ave only noticed it recently
post #13 of 17
Quote:
Originally Posted by Rittzy View Post

The noise gets louder with the volume not with the car reving higher and its like a white nosie/hiss sound. Still I cannot understand why this is happening to this stereo and not cheaper plus the fact I ave only noticed it recently

what ur describing..is exactly what i wrote biggrin.gif. get an ipod. and some headphones. turn the volume all the way up (no music) just the slider all the way up.....what im describing is this. a low signal to noise ratio and..lower quality parts(in the ipod's case, the low quality part is in the amp and headphone section). the ipod turns off it's amp after a bit so you might notice...that after u go back and try it again.. with the volume off. you dont hear anything...just bring the volume back down. press play on a song. . pause. and turn the amp(voume) back to max...and man u will hear it biggrin.gif
post #14 of 17
Quote:
Originally Posted by Rittzy View Post

The noise gets louder with the volume not with the car reving higher and its like a white nosie/hiss sound. Still I cannot understand why this is happening to this stereo and not cheaper plus the fact I ave only noticed it recently

that is kind of normal, almost all amps do this at some point.

go find a digital silence track and play it, you never know you may be getting some sort of interference from who knows what
post #15 of 17

just hook your O-scope up to the RCA's and sniff for noise floor in 'dbm' rolleyes.gif

 

*Theres lots of variables.. unless you have installed it meticulously.. your best bet is start over. Take special attention to each detail.. like making sure your RCA's run down a different side of the vehicle than your power and grounding. As well.. cheaper types of RCA's can be very susceptible to "catching" EMF. 

 

You will chasing ghosts much longer if you troubleshoot from here.. starting over with the install will make sure you correct the issue. [such as bench testing the unit to see if the noise is reproduced outside of the vehicle].

post #16 of 17
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post

just hook your O-scope up to the RCA's and sniff for noise floor in 'dbm' rolleyes.gif

*Theres lots of variables.. unless you have installed it meticulously.. your best bet is start over. Take special attention to each detail.. like making sure your RCA's run down a different side of the vehicle than your power and grounding. As well.. cheaper types of RCA's can be very susceptible to "catching" EMF. 

You will chasing ghosts much longer if you troubleshoot from here.. starting over with the install will make sure you correct the issue. [such as bench testing the unit to see if the noise is reproduced outside of the vehicle].

I dont have an o-scope unfortunatly but it would be quite handy. Also just to confirm this, its coming from the internal amps not any actually external ones. I havnt got that far yet as too start the install this has put my on hold.

I understand what everyone is saying and i do appreciate the help its just I couldnt understand why a cheaper unit sounds ok in my car but yet my dearer unit doesnt :/

I orignally thought it might have been the stock crossovers that came with the car but then the stock stereo worked fine and so did my mates and I didnt remembering hearing the noise/hiss in my old car which is why im so confused at the minute.
post #17 of 17

is your blue signal wire piggy-backed to your +12v lead by chance?

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