Let me ask, under the audio you sent. What is the purpose to even have those rear speakers fading to nothing? If they are not producing any sound, why not just disconnect?
mark

 

Simple, someone replaced one of your subs with a coax.

 

Never mind, I misread it.

 

Not exactly, the volume on the video is affected by the iphone freq response. You can still hear it on the video, but it's louder and lower in real life, not nothing. It's just not mid/high range. The rear response is all low frequency (i.e. 'muddy' sound) by intent.

And yes, mine are all 'verts. Isn't that the only good kind (with due apologies my coupe bretheren/sisteren...)?

 

Listen carefully during the full fades, it's not nothing, just low frequency. I have noted that there are limits to the iphone reproduction of this (around 50 Hz). In real life, it's louder and lower.

At my age, I cherish my 50 Hz sound since I no longer have anything above about ~14 kHz (though I can still torture my children and my students with loud 18 kHz sounds).

 

FWIW my 1998 convertible pretty much produces full frequency sound from rear.

John

 

These are the two speakers removed from my convertible 2001 XK8. When in the vehicle and faded back to rear they go to no musical sounds only fuzzy muddy nothingness. Are these the same 2ohm speakers you have? I'll hook them back and try an audio like yours. I guess if under this system as stock the output goes to next to nothing at full rear only, it will fade to a lower level as you blend it back to equal front rear, why would that even be installed. It just makes no sense. I was ready to purchase a new amp but if it only clears my muddy mess up a bit to very low level sound, why bother. Check out my speakers. Thanks so much. I'm learning and trying to understand. Maybe my Andriod will produce more range and you can hear and comment.

 

Power amp connector: (what's needed for any car amp?)

1. Left signal
2. Right signal
3. Signal ground
4. Battery
5. Antenna (turns amp on when radio is on.
6. ???

Does not look like front rear signals are delivered to amp separately.
Problem is: if thats true, how does fader setting get communicated to amp?

I'm going to keep looking for IC 17 pin out diagram.

John

 

I have no pictures of mine, and going into the rear always leaves me repairing brittle plastic, so mine looks like below. Have no pics of reverse, and do not know if they are 2 ohm. Seemed to remember they are either 2 or 4.


Random picture snagged from the internet of LJD4150BA (other side is 4151).

 

I believe they changed the systems in the 2000 MY.

 

From what I've read there is an AI Net link between head unit and amp.

See this for an interesting pinout: https://www.jaguarforums.com/forum/x...=Amp+connector

I suggest you do an advanced search on "Amp connector" lots of good info!

John

 

Same speakers I have just mine are out of the box.

 

I took a audir video but the forum will not accept the mp3 format. When I turn full rear, all I hear is a fuzzy thumping distorted. Nothing musical at all.

 

I just found that the 2001 XK* has rear fade disabled. IVe attached the supplement to the hand book. Maybe this is why I am hjaving so much trouble with the rears, they are disabled. I'll try the fix later on after dinner.

 

Why are there TWO threads on the same subject?

 

Different people are looking at and responding to each. They started out being different but morphed. Still no definitive answer does the 2001 just sound like crap muddy mess in the rear or something wrong. I think I'll just bite the bullet and go pay to have it checked out at a shop.

 

Unsure of the answer, but I count three...

 

LOL each post started off different, sometines people went way off topic, I think assumptions across model years were made which i found there are significant differences across 90s models and early 2000's models, and morphing happened. There are also some generic hints I cant tell knowing what I know now what they apply to, as specifics were not mentioned such as model year. I am only coming to some concrete facts finally after piecing together infirmation across the many comments from different people across all 3. I still dont have all the full final scoop, but have enough now to go pay someone to officially diagnose where my problem exist.

 

Mark (and all),

Yesterday I spent a bunch of time trying to find a way to prove the trouble to the amp or head unit. I started down a path of: where is fader control circuitry located: head unit or amp? Thinking was that if it resides only in the amp, that would narrow it down to an amplifier issue.

Now, I hurt my knee - doctors must have given me good drugs ;-). I don't know why I didn't see the easy/ obvious. The same bloody head unit is used for premium and standard audio. No amp used with standard audio, but of course fader works with standard!

Please excuse any of my speculation that inoperative / distorted rear channel sound may by caused by amplifier issues. Fader is obviously controlled / operated by headunit. I don't know how I missed something so obvious.

Mark if you're still trying to shoot the problem, think about this:

Standard audio head unit plugs right into speaker leads to speakers. Remember it becomes premium by flipping a switch on back of head unit and pre-out audio signal is then sent to amp through the premium audio cable harness.

This begs the question: is the standard audio harness just sitting there unused? If so, why couldn't you disable the amp (pull fuse), flip the head unit switch to standard,, connect the rear speaker to standard rear audio speaker wire and give it a listen. Still distorted? . . . Yes = defective head unit.

John

 

Ok, on my way to bed I saw this. I've read it 3 times and I'm top tired I think to comprehend. I'm not sure what you're saying. I'm not even confident I have a premium system or not and I dont know anything about a switch on the back of the head unit. Lol. I'll re read tomorrow on a ckear mind, I hope. Thank you so much for all this thought.
Mark