many poeple get an revs related whine after fitting a cd changer or phatbox. after i fitted my phatnoise i had 2 noises:
1) high pitched sound like morse code going on in the background
2) engine speed related quiet whine that many people had suffered.
to get rid of 1) i wrapped the phatbox in a thin layer of plastic sheet and mounted it in the changer holder using nylon screws - this removed the 2nd earth path via the case and worked a treat
to get rid of 2) i tried all sorts including putting multiple ferrites on the changer cable - none of which helped until i also put one right at the end of the cable near the back of the radio - and hurrah, the engine whine has gone completely.
i was considering running separate phono cables to the phatbox for the audio feed to the head but dont need to now at all.
1) high pitched sound like morse code going on in the background
2) engine speed related quiet whine that many people had suffered.
to get rid of 1) i wrapped the phatbox in a thin layer of plastic sheet and mounted it in the changer holder using nylon screws - this removed the 2nd earth path via the case and worked a treat
to get rid of 2) i tried all sorts including putting multiple ferrites on the changer cable - none of which helped until i also put one right at the end of the cable near the back of the radio - and hurrah, the engine whine has gone completely.
i was considering running separate phono cables to the phatbox for the audio feed to the head but dont need to now at all.
