Alternator A/C voltage question

[wpoll]

Originally Posted by Bmwe5320023.0

... Your suggestion lifting the ground portion of rca cables is interesting. I never heard if before. I need to bend them away? I guess this would destroy the rca cables for future use? ...

No need to destroy your RCA cable - grab two RCA plugs and two RCA sockets from RadioShack and wire them with only the centers connected (not the earths).

Or grab one of these...



https://www.amazon.com/dp/B000LP4RMG?th=1

[Bmwe5320023.0]

Ohh I see. Tried them, the didn't do much.

[wpoll]

Still worth trying the half-wired RCAs - something is causing the whine! :-)

[Bmwe5320023.0]

Something definitely is. I ordered two of these
Jensen Transformers Iso-Max CI-2RR

And also ordered Newmar 150-A Alternator Filter to rule out any ripple issues.

I'm not sure I totally understand how to try your suggestion with rca sockets and plugs. Do you have a video or image demonstration?

[wpoll]

Originally Posted by Bmwe5320023.0

Something definitely is. I ordered two of these
Jensen Transformers Iso-Max CI-2RR

And also ordered Newmar 150-A Alternator Filter to rule out any ripple issues.

I'm not sure I totally understand how to try your suggestion with rca sockets and plugs. Do you have a video or image demonstration?

Simply take an RCA plug and socket and solder a wire from the centre pin on each to the other - don't do anything with the earth connections.

Make two of these.

Now unplug the RCA cable from the amp's input, insert the RCA plugs (you just made) into the amp's inputs and then plug the RCA cables (from the HU) into the sockets.

You now have a signal path from HU to amp (for left and right channels) but the RCA cables are ONLY earthed at the HU end (not at the amp end).

Might help...

[jsoto]

BMWE. I was scrolling the thread on page 1, going to page 2 to put my reply.....
The Jensens' should resolve it for ya.......in this chassis, I ran a full Alpine F1, Focal BE --- etc with Genesis amps.

[Bmwe5320023.0]

Originally Posted by wpoll

Simply take an RCA plug and socket and solder a wire from the centre pin on each to the other - don't do anything with the earth connections.

Make two of these.

Now unplug the RCA cable from the amp's input, insert the RCA plugs (you just made) into the amp's inputs and then plug the RCA cables (from the HU) into the sockets.

You now have a signal path from HU to amp (for left and right channels) but the RCA cables are ONLY earthed at the HU end (not at the amp end).

Might help...

Ohh now I see what you mean...

It would be way easier and cheaper to just buy cheap rca cables and destroy them than buying sockets and plugs and soldering them together!

[Bmwe5320023.0]

Originally Posted by jsoto

BMWE. I was scrolling the thread on page 1, going to page 2 to put my reply.....
The Jensens' should resolve it for ya.......in this chassis, I ran a full Alpine F1, Focal BE --- etc with Genesis amps.

That would be great! Ordered two Jensens and 150 amp alternator noise filter. So at least alternator ripple will be rules out.

It terms of Jensens, I don't know if they will work.
Here's what I've been told on another forum:

Since you can hear the 'whine' (noise) out of your speakers, it has already become part of the audio-band signals, filtering the audio output RCAs (if you have any to begin with) means the whine cannot be filtered OUT without also filtering the audio signal.

[wpoll]

Originally Posted by Bmwe5320023.0

Ohh now I see what you mean...

It would be way easier and cheaper to just buy cheap rca cables and destroy them than buying sockets and plugs and soldering them together!

Not here - plugs/sockets are WAY cheaper than even the cheapest cable - but yeah, what ever works.

Key thing here is the "lift" the earth connection from the RCA connectors at the amp end - not the HU end.

Same goes for the earth loops isolators you show above - they will work best when fitted close to the amp (directly on the amp inputs) - not close to the HU.

[Bmwe5320023.0]

Yes I tried the isolators at the amp end.
I will try the rca cables tonight and will include the pictures.

Yeah I can buy a set of rca cables for like 10-20 dollars with next day delivery!)

So no one seems to mention it, there's two types of cables.
Twisted pair and insulated rcas. My extra spare rcas I use are actually twisted pair. But I may have some insulated too. They're both expandable. I'll include some photos.

Someone also suggested on audio forums that spark plugs and coils can cause problems so I ordered a set of Denso.