shaggy

Electronics Depot

That's serious

http://autoplicity.com/products/242191-MSD_Ignition_8830_msd_noise_filters.aspx?utm_source=GoogleShopping&utm_medium=CSE&utm_content=242191NOFITMENT&utm_campaign=GSNOFITMENT&gclid=COzLldHh6q8CFZFR7AodzBTL3g Buy this . On the the passanger front wheel well there is a ground and a spot where you jump start the car. Install this there it has worked for me to filter out alternator noise.

nope

Apopka,FL

...did you read? At all? That was the entire point of the post. Dirty signal doesn't necessarily have to be clipping. Distortion lives in other ways. I read fine but you missed my point. The spike on the sine wave is not distortion imo but from something else like noise. I have seen this before. That distortion in the waveform is caused by a Class A/B amplifier with the output device bias adjustment (internal) set too low. This is called "Crossover Distortion". NO not Crossover as in Low Pass ect! Crossover as in where the waveform crosses the 0V point and goes from positive voltage to negative voltage. The DD-1 looks for harmonic distortion, that is anything that is a harmonic of the fundamental. What that means is if you are playing 40Hz (the fundamental), the tool looks for things that are not 40Hz, which any noise, "spikes" whatever are not going to be 40Hz because if they were they would be the same as the fundamental and you wouldn't see them at all. Harmonic Distortions of 40Hz would be 80Hz, 120Hz, 160Hz, 200Hz...ect Well there you have it . I didn't know it read harmonic distortion. I just figured it was reading the sine wave for squaring. Very cool I can't wait to get one.

Well I wish I could explain it, but I can't . I'm just saying that IMO the spike on the sine wave is something else.

...did you read? At all? That was the entire point of the post. Dirty signal doesn't necessarily have to be clipping. Distortion lives in other ways. I read fine but you missed my point. The spike on the sine wave is not distortion imo but from something else like noise. I have seen this before.

That signal is not clipped. The spike looks to be from having a crossover on or something like that.

Ok more info . What amp?

I had a customer one time that had noise that I couldn't figure out like this . Well he decided to get a high output alt and after installing the alt the noise was gone. Bad alternator.

So when you pull the RCA out of head unit there is still noise but if you disconnect RCA from amp it goes away. Have you tried a new RCA? Also disconnect all speakers from amp. Then connect one at a time to see if one speaker causes the noise cause you may have a shorted wire or speaker. I have seen speakers that would short to ground through the basket

I have the same van and it will fit. The box i'm building in mine is a full sheet of wood deep.

It sounds to me like you have a burnt ground trace in the radio. What can happen is if your ground is weak for your amp it will seek ground from somewhere else like trough the ground on the rca and will burn a trace in the radio. So either have the radio checked out or try grounding the negative side of your rca and see if that fixes it.I have seen this before.

If your listening to rap music 70 is to low try it at 100.