G'day.

I've got a petrol Mav. The old Pioneer CD radio worked fine however decided to update to digital age and got another Pioneer that takes CD, USB, and SD card. I think it also takes 3.5mm jack.

I've had two of them now, and both have crackled when they feel like it. Quite a bit sometimes, not at all otherwise, and never when the ignition is set to ACC.

The thing is, it never crackles on AM or FM radio, only on SD or Ipod or CD.

I've upgraded the earth from what worked with the original unit - still no joy. Same with the positive supply. Even fitted a 20A filter in the supply.

When it is in the mood to crackle, maybe it crackles more when decellerating to a stop, or at idle, then when at speed, but it is hard to pick.

I dunno if it is voltage related, thought it might be given it does not happen when engine is stopped, however connected up a voltmeter, and while the battery is charging after a cold start, the volt meter indicates 14.6, yet no crackle.

It is beginning to get a bit frustrating - any suggestions very welcome