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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Mon Jul 15, 2019 11:25 pm    Post subject: Problem with Alpine ILX700 Reply with quote

I had PCM and Bose, non MOST system, it sounds rubbish, one note bass and overall poor SQ.

I got the PCM swapped out with the ILX700, mainly for Apple play and hands free, I asked a garage to do it. It sort of works, but sounds terrible. I get a horrible hiss too. The gain setting aren't right, volume set to 2 is just about ok, 4 it starts to distort. I guess I need to turn the gain down somehow, either on the amp or the headunit.

I've checked the headunit and used Alpine tuneit, but nothing. I'm wondering if the person that installed it wired up the speaker out to line level.

Any one got any ideas? (I've started a new thread as the old one got spammed) thanks.
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Hertsdriver
Nürburgring


Joined: 12 Nov 2018
Posts: 472
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Tue Jul 16, 2019 6:13 am    Post subject: Reply with quote

It’s probably your old settings, you have to make sure the bass, treble and the front/rear and side to side faders are set to zero on the pcm before it’s removed...
 
  
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Hertsdriver
Nürburgring


Joined: 12 Nov 2018
Posts: 472
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Tue Jul 16, 2019 6:13 am    Post subject: Reply with quote

It’s probably your old settings, you have to make sure the bass, treble and the front/rear and side to side faders are set to zero on the pcm before it’s removed...
 
  
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DanSteele
Newbie


Joined: 16 Oct 2018
Posts: 33



PostPosted: Tue Jul 16, 2019 8:48 am    Post subject: Reply with quote

Hiss could be due to gain too high on amp, but also a fault with the amp.

My passenger dash speaker hisses slightly, never noticed when I had pcm installed/thought it was sound of cd spinning up. Functions perfectly otherwise. I checked that it was most adapter etc

One of these days I’ll get round to taking it apart and rectifying it, for now I’d forgotten about it until o read your post.

Wonder if there’s a way of doing a master reset on the amp to put it back to neutral values without having to resort to reconnecting pcm? (bit of faff and risk damaging dash etc in the process)

Dan
 
  
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Tue Jul 16, 2019 2:34 pm    Post subject: Reply with quote

Hertsdriver - thanks for that. I’ll have to reinstalled the original PCM in that case. I presume if I replace the BOSE amp, I won’t have to do this? Plus it should be better.
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Hertsdriver
Nürburgring


Joined: 12 Nov 2018
Posts: 472
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Tue Jul 16, 2019 2:42 pm    Post subject: Reply with quote

uk996 wrote:
Hertsdriver - thanks for that. I’ll have to reinstalled the original PCM in that case. I presume if I replace the BOSE amp, I won’t have to do this? Plus it should be better.


If you have access tot he PCM then it isnt a big hassle to plug it back in and set it all to zero.
The other thing I thougth about was have you set all the ILX's various setting up correctly? I took all the artificial booster type ones off of mine when I fitted it, and remember theres a setting for carplay, aux, radio....

in regards to BOSE 'better' is a subjective term.... Laughing from memory there are 3 or 4 amps in the BOSe system, so its a lot of work to remove it all. Do you know what MOST convertor was used in the install?
 
  
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Tue Jul 16, 2019 2:54 pm    Post subject: Reply with quote

Mine isn’t MOST, no fibre optics in mine

I meant anything else I replace the BOSE with would be an improvement
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Hertsdriver
Nürburgring


Joined: 12 Nov 2018
Posts: 472
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Tue Jul 16, 2019 4:01 pm    Post subject: Reply with quote

I thought BOSE is a MOST system with full fibre optics......

Last edited by Hertsdriver on Mon Sep 16, 2019 11:13 am; edited 2 times in total
 
  
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Tue Jul 16, 2019 5:53 pm    Post subject: Reply with quote

interesting, door speakers have BOSE emblazoned on the front. I didn't get the MOST adaptor, but I didn't install it.

Looks like I need to take it out to reset the amp settings and then I can check to see if it's been connected to the speaker out.
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WD-40
Newbie


Joined: 31 Jan 2019
Posts: 15



PostPosted: Fri Jul 19, 2019 3:15 pm    Post subject: Reply with quote

I've also swapped out my PCM with an aftermarket stereo and also get an irritating hiss and despite paying for a harness, it doesn't sound like the amp is connected.

I need to take it back to the installer, but initial research has suggested that the hiss might be to do with the earthing cable
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2002 996 C4 Lapis Blue
 
  
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Sun Sep 15, 2019 11:07 pm    Post subject: Reply with quote

Ok, I've got round to plugging the original PCM2 back in. Checked the audio settings and they were set to flat :-(


I bought the connection kit from Autoleads, I was recommended their Audi Bose harness which comes with the Autoleads H2L, a high level to low level converter.

Bear with me here, this gets complicated.
1) I disconnected the audio leads (phono) from H2L, music kept playing. I followed the cable to the connector which connects to the car's harness. There is nothing there on the car side.
2) the balance and fader controls don't make any difference via the amplifier, I've checked the HU via the line out, it all works from there and sounds quite good.
3) The active aerial converter has a blue lead, which wasn't connected to anything.

I've come to the conclusion I've been sold the wrong harness and the person who fitted it doesn't have a 100% grasp of how it works. I've connected the blue cable to the power antenna lead on the HU, not suprisingly, the radio reception is much better now.

My PCM2 & Bose system definitely doesn't have the MOST system.

Next steps is to contact Autoleads and see what can be done. Hopefully I can move a few of the pins and wire it up from the pre-out, low-level output and regain balance, fader and improve the sounds quality.




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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8505
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Sun Sep 15, 2019 11:52 pm    Post subject: Reply with quote

Just to confirm my Bose doesn't have the MOST fibre system, it was changed to fibre somewhere around 2002/3
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maldren
Suzuka


Joined: 07 Oct 2016
Posts: 1197



PostPosted: Mon Sep 16, 2019 7:52 am    Post subject: Reply with quote

Yes, I'm fairly sure the MOST system came in with the facelift model and isn't Bose specific.
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Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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Hertsdriver
Nürburgring


Joined: 12 Nov 2018
Posts: 472
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Mon Sep 16, 2019 11:11 am    Post subject: Reply with quote

well thats weird, as the OP's car is a facelift (at least it has a glovebox from what I can see).

I guess the fact that you have disconnected something and can still hear something sort of points to some of the bose amps not working, and that would certainly explain the poor sound.

when you reconnected the PCM did it all sound ok?
 
  
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Mon Sep 16, 2019 8:00 pm    Post subject: Reply with quote

All 996 turbos came with facelift lights. Mine is 2002 MY and has the glovebox, but not the MOST system.

Hmm, the sound quality is poor with the OE PCM2, but worse with the new HU. I've got a hunch and I'm going to test it again.
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Tue Sep 17, 2019 3:28 pm    Post subject: Reply with quote

Well, I've found that the HU is doing funky things with the DSP and may be interacting with the DSP on the Bose amp, so I've been playing with the settings and found that I could make it work better by using the fader control to attenuate the signal so that the main vol control does something, instead of just, 0 - silent, 1-quiet, 2 - too loud and distorted. Also turned the bass down significantly, as the bass quality is awful anyway.

I've been reading up a lot more about the sound systems in these cars and I will try to live with what I have, otherwise it's replace the amp with a JBL 6 channel d class amp (small) and the speakers for Alpine 10cm ones. Probably disconnect or remove the Bose sub which sounds terrible and replace with a small underseat active sub.

As an aside, I found that the fader and balance function doesn't work with the original PCM2 HU or the amp is partially broken or may be both ...
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Dammit
Indianapolis


Joined: 23 Sep 2016
Posts: 2387



PostPosted: Tue Sep 17, 2019 3:35 pm    Post subject: Reply with quote

If you're in London (or, potentially, Reading) anytime soon you are welcome to have a listen to mine for comparison purposes?
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My 996, AKA Project Ridiculous
 
  
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Tue Sep 17, 2019 10:28 pm    Post subject: Reply with quote

PM incoming Dammit ... thanks
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Thu Sep 19, 2019 11:02 pm    Post subject: Reply with quote

I've contacted the supplier for the Autoleads harness and they've been very helpful. They're sending me another harness, hopefully that'll do a better job.

I'm likely to swap out the dash speakers for the Alpine SPG-10C2 as people seem to get good results with these and they're well priced.

I'll hold off doing any more till I hear Dammit's car and the results from my HU driving the existing parts as I'm not expecting hifi in a 996.
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uk996
Monza


Joined: 09 Jan 2018
Posts: 167
Location: Home Counties


PostPosted: Fri Sep 20, 2019 2:15 pm    Post subject: Reply with quote

Ordered a pair of Alpine SPG-10C2 to replace the dash speakers, I had a £5 ebay voucher, so they ended paying £32 for the set delivered. Harness is on its way.
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