Holy thread from the dead batman

Noticed the years-old image link above was broken, here it is again:

 

Yes... Necro-Bump extreme !

I HAVE, however, done due diligence and combed this forum well in search.
I've read this entire thread... and also the great research I've found on the actual signal OUTPUT is from this thread... CLICK HERE... Thanks Kevin for sharing your invaluable info with us.

What I am asking about... and what was not adressed above in response to LaserBlues queestion, as far as I can tell....
.....This question is about INPUT via the AUX-IN 3.5mm jack... (and NOT the 70hz OUTPUT notch shown so well in Kevins thread)


QUESTION: Is the Aux-IN actually clipping Low frequencies before that aux-in signal enters the head unit, when using Aux-in as a source ?

If YES or NO... any solid evidence to that position??


While it is possible that I'm being a bit obtuse here, and I've missed this information... it's not from lack of effort... and If you can point me to that info related to AUX-IN ... I'll be very appreciative for a 'nudge' with a link in that direction.

Myself, and others are using Aux in directly via a cable, or one of the BT Adapters like BOVEE (or others)... that uses the AUX-IN for the actual input to the HU. My iPhone IS the source for 85% of the media played in my car.... Hence this question about INPUT to the HU.

Any help you can lend....THANK YOU !








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The notch is happening in the head unit, not the aux in. Maybe I'm not understanding what you are asking, but I don't see what difference it would make - regardless what input you use, the output will have that notch on the rear channels. Or am I missing something?

 

Kevin, thank you for your follow ups here... and for taking the time to scratch your head with me a bit.
I'm probably not being clear, which is why you are missing something.

I will NOT be using the rear channel for ANYTHING... It will be cut, shrink wrapped, and put to the side and the fader set to front permanently.
The only channels that will be used for anything, like in your T-harness RCA outputs, is the full-spectrum front outputs from the stock HU... (maybe even only one will be used in my application. )

Your other thread showed me that the rear channel is NOT a good signal source for anything with that big 'hole' at 70hz.
I would imagine this is the reason why you don't use the rear channel signal, in your T-harness.

It was mentioned in the thread above that the AUX-IN limits the low frequency INPUT to the head unit...
That question was asked for clarity earlier in this thread, years back by LaserBlue... and I brought it up again this morning as it was never answered.

I want to find out, definitively, if the signal from the AUX-IN is at all modified BEFORE being processed as an output by the stock HU.
This is in a standard NON HiFi/HK system with 6 speakers.

The OP above made a good argument that the AUX-IN has limitations.... in his post above

I'd like to get opinions on the possibility that this is true??

I am NOT interested in the limitation of the External-device providing this signal... I'm only interested in any, possible, limitation on the part of the Factory base HU to accept low frequency input via the AUX-IN jack

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I hope that I've detailed my question well enough.... as I am sincerely interested in finding the answer to this question.

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Yeah, you'll be fine. The filter is not on the aux in.

 

Thanks Kevin, you are an experienced, professional asset to this community of NAM !



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Is there any issue with only using one or two of the factory head unit speaker outputs and leaving the unused ones disconnected. They would be covered with double shrink tube.


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That could be a problem, depending on what you intend to do. This is where you might want to consider the X9331 harness. One of the protection circuits in the HU is overvoltage. If the HU output is unloaded or lightly loaded, the voltage can spike enough at high volume to activate that protection. You'll know this has happened because the HU output will cut out and not resume until you've restarted the vehicle (lights on the HU will remain on).

Why would you only use one channel? You'd have mono, not stereo.

 

Thanks Kevin !!

Typing error on "1 channel".... I meant one channel PAIR... So A pair of channels for the front.... rather than 2x front Pairs, OR 2x front Pairs, plus 1x rear Pair.




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Kevin,

Do you know which channel(s) that the factory chimes run through in the factory head unit?

Thanks in advance.... and thank you for all of your contributions here and across the forum !
You are a rare breed these days and I, for one, appreciate your sharing !


Eric

 

Front channels for sure. I do not recall if they also run thru the rears. PDC (if you have it) runs thru the rears. I'm guessing you must have everything already torn apart? Otherwise just open a door and put your ear next to the speakers

 

Hi I have a dvd sat nav / stereo six speaker system no amplifier.
wondered what the stereo is classed as and can I use ncs expert to remove the 100hz crossover issue ie stereo to hifi setting please.