There are a couple of existing topics that seem to suggest alternative approaches to my problem but anyone got any first hand experience on which is the best method?
Current issue is my Parrot MKI9100 gets the whine related to engine speed (not so noticeable on calls as cant hear at higher revs anyway ) but tried putting usb music through it and realised how bad it was.
I'm going to be pulling my dash apart anyway soon so just looking for more specifics on what the best resolution is (I didn't have parrot installed so no idea what has been done)...and possibly further advice on avoiding this with a future Nexus install.
My current plan is to have both parrot and nexus able to feed stereo but not sure how feasible that is.
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Pete/Peter him/he/hrh couldn't really care as have 3 siblings and was lucky not to get called by the dogs name.
I use a ground loop isolator to avoid the noise that I otherwise get when running audio from my phone via a jack, when the phone is also charging.
The noise was horrendous when using a cheap USB 12V adapter and got better with a good one, but only went away completely with the ground loop isolator.
I have tried a ferrite choke, from a old keyboard lead, but it made no difference at all.
These users thanked the author warpc0il for the post:
I do as Dave does as well. A simple ground loop isolator (like £2 off fleabay or some such) cuts it out perfectly.
Ferrite choke doesn't work as they are for a different type of interference. If you are having issues when you have a phone call coming in (that lovely ticking noise that can accompany it for example) then that will be what you'd use a ferrite choke for.
These users thanked the author Dr. FrankenRex for the post:
bigpete8 (Tue Oct 16, 2018 2:11 pm)
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forgive my ignorance but where do you fit the ground loop isolator ? as its meant to go on the signal line? and the RX amp is built into the head unit isn't it? so how do you break into the signal line between radio and amp?
or is this advice only applicable to aftermarket setups?
I only get the noise when I use my aftermarket wireless / bluetooth device
you know one of those cheap things you plug into the lighter socket and tune your radio into 107 FM to then play your phone or have handsfree via the radio speakers
I was thinking its likely the lighter socket wasn't isolated that well from the factory ( well why would you?) so was considering where to fit a capacitor to try and damp out the electrical noise
its hardly the worlds most pressing problem but it'd be nice to fix it
If you try a ground loop isolator and it doesn't help then you may be better off saving the hassle and upgrading your external wireless device.
Some cheaper electronics are poorly made/shielded internally and will produce noise no matter what you do to the signal. Even with ground loop isolators and active signal processors installed prior to the amp or speaker. That includes some cheap aftermarket headunits.
It's just polishing a tu... well you know what I mean.
) but tried putting usb music through it and realised how bad it was.
