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GROPIUS
post 26th October 2017 07:17
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Ooooh dear...I have sinned and won a complete Bose system
including amp, ecu and headunit with all codes on ebay.
Bose is known for being totally overpriced.
Well...
...this set-up was dirt cheap.
Headunit is a Nav+ but I'm very tempted
to make my beloved Kenwood to communicate with the Bose amp/ecu.
The idea behind all this...
...the breadvan will become my new company van.
146 front seats courtesy of cloverbreaker,
rear seat will be folded permanently
and any decent sub combo would have been to big and expensive!
To give you an idea...
...didn't want to loose my spare-wheel
so the only space is along the rear side-windows.
Shallow subwoofers are around the 70 mark plus amp.
Well...
I've paid less than 70 for everything.
Boom Boom is NOT what I'm after
and
the GT Bose sub will fit nicely with just a few minor alterations.
Can't wait to put my hands on all this.



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dante giacosa
post 26th October 2017 07:28
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That sounds exciting GROPIUS.

I've done 20 years of pro-sound-system installation and have recently gone off on a bit of a bender with the 146 (have been saving some retro-goodies for the right car).

I wouldn't have said the BOSE stuff was 'over priced'- just that it is expensive!!!

But a lot does go into it.

I my experience of other cars I have had with the BOSE gear as standard- they tend to favour quite a low-heavy one, which is usually a bit much to my ears.

Can't wait to see what you've got though!

get a picture..!
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GROPIUS
post 26th October 2017 08:04
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QUOTE(dante giacosa @ 26th October 2017 08:28) *
That sounds exciting GROPIUS.

I've done 20 years of pro-sound-system installation and have recently gone off on a bit of a bender with the 146 (have been saving some retro-goodies for the right car).

I wouldn't have said the BOSE stuff was 'over priced'- just that it is expensive!!!

But a lot does go into it.

I my experience of other cars I have had with the BOSE gear as standard- they tend to favour quite a low-heavy one, which is usually a bit much to my ears.

Can't wait to see what you've got though!

get a picture..!

I've been a musician since the late 70s.
Did a degree at the SAE Institute in Munich as a sound assistant and worked for a small label for about 2years.
I normally go for HighEnd gear like Focal or JL-Audio speakers.
(I love Kenwoods for some strange reason too...lol)
Always had PMC speakers (and Genelecs) with cyrus Mono Amps in my Studio set-ups...
blows you away...NO distortion at any level.

Don't mind the low heavy sound just needs some tweeters to soften the lot.
The door cards and rear will need some alterations...we'll see


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dante giacosa
post 26th October 2017 10:42
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oh yeah?

I'm running Quad 520 power stages in house, and I've some active Genelec stuff too, on a different system.

I was exposed to some PMC gear a few years back too. Good stuff.

I was trying to find a pink noise test disc for a recent quick-go at the setup in the 146! But I'm going to have to make one from the EQ plug-in in Logic!

However- I haven't got decent drivers yet in the doors, so I'm kidding myself at this point.

are Focal & JL Audio highend..? I really don't know. I did a lot of reading into specs a couple of years back and chose Infinity stuff when I was swapping the interior over in my FIAT Coupe- but it seems quite hard to source now. It had good efficiency and LF extension for co-ax driver (that was going to disappear into a rear panel).
I'm not sure I'd go for it again though.

Sounds exciting- this could be the 1st 145/6 audio install really worth reading about!!
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GROPIUS
post 26th October 2017 16:00
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QUOTE(dante giacosa @ 26th October 2017 11:42) *
are Focal & JL Audio highend..? I really don't know. I did a lot of reading into specs a couple of years back and chose Infinity stuff when I was swapping the interior over in my FIAT Coupe- but it seems quite hard to source now. It had good efficiency and LF extension for co-ax driver (that was going to disappear into a rear panel).
I'm not sure I'd go for it again though.

Sounds exciting- this could be the 1st 145/6 audio install really worth reading about!!


Focal certainly is...JL-Audio are HIGH power good sounding speakers and their poweramps are not bad at all.

Don't expect to much from my little Bose setup...all on a budget and time.
Will try my best thou...lol


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dante giacosa
post 24th November 2017 12:08
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okay!

I've got the Infinity 6.5"s in the front doors, and made them invisible.

cursory pink-noise analysis reveals a terrifying standing-wave at about 225Hz!

thinking caps on!


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GROPIUS
post 14th December 2017 00:07
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After some heavy digging to find a wiring diagram for the Alfa Romeo Gt Bose amp I've finally managed to make my new loom.
The Bose soundsystem normally takes its signals from the speaker outputs.
If you don't use an Alfa Romeo headunit (mainly Blaupunkt) and connect to the high output (speaker) you either have low or very high volume and not a very good sound quality.
Better aftermarket headunits have multiple AUX outputs.
Superior sound!
Problem is...
you have to have at least 2.5volts to achieve a decent volume.
Not easy to find.
An option is to use something like this...
https://www.carid.com/cerwin-vega/2-channel...mpn-ioemhl.html
either high OR low level input and the possibility to increase/decrease voltage=volume
I've found a Kenwood DAB with 4volt outputs which is more than enough for my application...
Stay tuned...



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dante giacosa
post 14th December 2017 15:35
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!

so, you are talking about a sensitivity mismatch..?

seems like a lot of hassle just to get that amp working- BUT if it is a BOSE amp as used in the GT; that would be kudos enough for me too!

So, I can see the problem.

That line-matching stage you linked to looks to be a good bet, I'd say.

would that mean you could keep the existing Kenwood unit in use..?
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GROPIUS
post 14th December 2017 22:50
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QUOTE(dante giacosa @ 14th December 2017 15:35) *
would that mean you could keep the existing Kenwood unit in use..?

Using Pre amp outputs just gives a much cleaner signal!
The Bose amp and all the speakers are 2 Ohm...funny that
I'll be selling my trusted Kenwood as the new unit is DAB and also charges my ipod.
Nice little bonus is the green illumination.



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GROPIUS
post 1st January 2018 10:19
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QUOTE(GROPIUS @ 14th December 2017 22:50) *
Using Pre amp outputs just gives a much cleaner signal!
The Bose amp and all the speakers are 2 Ohm...funny that
I'll be selling my trusted Kenwood as the new unit is DAB and also charges my ipod.
Nice little bonus is the green illumination.

The loom is ready for the install.
What a PITA that was.
DAB aerial ordered.
Next step is to remove the rear bench and locking brackets for the backrest (or whatever they are called)
Can't wait to finally start building the new sub box...
...and convert the breadvan into a VAN coolio.gif



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dante giacosa
post 2nd January 2018 10:12
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wow-

So, you are removing the rear seats in the interests of the sub-box??!!

The WHOLE CAR will be like a tuned-resonant enclosure! Like you are DRIVING a speaker cabinet!!?

That's amazing- I can't wait to hear what happens next...
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richgreenalfa...
post 8th January 2018 13:05
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Hi Gropius,

I'm very interested in your install... I too have the GT Bose kit (less the entire loom) which i pulled from my old GT.

I also have a 145 so would be keen to see what you have done/going to do with your project please?

I'm not massively electrical savvy so any pointers/pics from you would be useful smile.gif

All the best,

Rich
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GROPIUS
post 11th January 2018 16:04
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Little update on the Bose set-up.
Did a test fit with the altered cable routing on the tweeter.



And the Bose loom prepared to reuse the existing 145 speaker wiring.



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dante giacosa
post 11th January 2018 16:08
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W'hoa! STOP THE BUS!

Is that the HF unit from the A-pillar, mounted concentrically on the full range door speaker?!

How does it sound??


Why move it down..?

good cable-work...
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GROPIUS
post 11th January 2018 16:33
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QUOTE(dante giacosa @ 11th January 2018 16:08) *
W'hoa! STOP THE BUS!

Is that the HF unit from the A-pillar, mounted concentrically on the full range door speaker?!

How does it sound??
Why move it down..?

good cable-work...


The GT Bose speakers have a fake tweeter grill on the A pillar.
The front and rear GT Bose speakers have the tweeter mounted on the midrange woofer grill.

I haven't installed the Bose amp or sub yet.
So...
I'm running the fronts of my new Kenwood head-unit.
Wont do this for very long nor will I run them on high volume...
Bose speakers are 2 Ohm.

Its not the prettiest loom but I'm quite happy with the result
Thank you anyway blush.gif



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dante giacosa
post 12th January 2018 09:20
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Hey Gropius-

good effort; Interesting to hear of the fake HF driver on the A-pillar in the GT. I wonder if the standard sound system utilises this position genuinely.

You could run 2 ohm stuff quite happily I would think; I am sure you can tell when they start to sound a bit strained.

An interesting thing to remember in this instance- is the distinction between mechanical & electrical distortion. One being too much power, and the other being too little.

Anyway- I am sure you have the ears to get through it!

Any thoughts on mounting the amp..? I picked up a negative bond from the OS rear, under the light cluster internally, there was a threaded stud.
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GROPIUS
post 2nd February 2018 07:50
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QUOTE(dante giacosa @ 12th January 2018 09:20) *
Hey Gropius-

good effort; Interesting to hear of the fake HF driver on the A-pillar in the GT. I wonder if the standard sound system utilises this position genuinely.

You could run 2 ohm stuff quite happily I would think; I am sure you can tell when they start to sound a bit strained.

An interesting thing to remember in this instance- is the distinction between mechanical & electrical distortion. One being too much power, and the other being too little.

Anyway- I am sure you have the ears to get through it!

Any thoughts on mounting the amp..? I picked up a negative bond from the OS rear, under the light cluster internally, there was a threaded stud.

I've finally managed to test run the Bose with all bits connected...
You may remember that I was running the bose speakers (without the sub) of my headunit...
The sound was OKish but the fact that the Alfa ISO speaker connector does NOT comply with the ISO norm did NOT help
Whats the point of having a norm and not utilising it?!
Anyway...
...after turning on the headunit...
the sound was surprisingly good w00t2.gif
I'm still working on the sub design thou.
This little speaker might need a little bit support from a bigger brother (from another mother/father)
The Bose amp will be either near the rear arch or where the rear seats used to be.
Not sure yet.
I've stripped the rear end more then planed... blush.gif
A bit more boxing in to do...lol
...and now the question is...
should I cover the plywood or leave it exposed?



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dante giacosa
post 2nd February 2018 11:30
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this deserves a larger response-

but in the meantime; "yes"; cover the plywood
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Ganz
post 7th February 2018 21:26
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Good work Gropius. I'm a bit cheap skate on speakers but am looking to replace the fronts. I want a decent low frequency for the bass. I noticed my 145 speakers and after market stereo is not as good as the Bose system on the 147.

This post has been edited by Ganz: 7th February 2018 21:27


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GROPIUS
post 8th February 2018 08:04
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QUOTE(Ganz @ 7th February 2018 21:26) *
Good work Gropius. I'm a bit cheap skate on speakers but am looking to replace the fronts. I want a decent low frequency for the bass. I noticed my 145 speakers and after market stereo is not as good as the Bose system on the 147.

NO CHANCE to add any BOOM without a sub.
But you can make them sound much better.
The Bose sub is not bad in the 147/GT handled by the ecu/amp wizard.
A good upgrade from OE are these for the fronts...
https://www.ebay.co.uk/itm/ALPINE-ALFA-ROME...zYAAOSwq7JUAe4N
and the rears...
https://www.ebay.co.uk/itm/ALPINE-ALFA-ROME...OwAAOSwhMpT0N8A
and I have a good Kenwood HU you could have for NOT much money at all whistle.gif
To add some low frequencies...
...had this underseat sub a while back...
https://www.ebay.co.uk/itm/KENWOOD-KSC-SW11...dgAAOSwnbZYEd5z
not bad for the size.


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