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[mathewst]

Well I won't agree TheBoy with this last statement.
I know Bose is 2 ohm impedance and sony HU is definitely 4 ohm imp.
But if it is i high level Sony unit it will give some 27 watts rms per channel on 4 ohms.
If you use it on 2 ohm  speakers the power will double to 54 watts rms per channel theoretically.
It wont work well but can easily blow out old Bose speakers which cannot stand that amount of power either beacuse of age, design, etc.
BUT I also agree this isn't the way to go.
If you have Bose speakers and aftermarket HU throw them away and get a decent new pair of speakers

[Dave DND]

Well I won't agree TheBoy with this last statement.
I know Bose is 2 ohm impedance and sony HU is definitely 4 ohm imp.
But if it is i high level Sony unit it will give some 27 watts rms per channel on 4 ohms.
If you use it on 2 ohm  speakers the power will double to 54 watts rms per channel theoretically.
It wont work well but can easily blow out old Bose speakers which cannot stand that amount of power either beacuse of age, design, etc.
BUT I also agree this isn't the way to go.
If you have Bose speakers and aftermarket HU throw them away and get a decent new pair of speakers

Not disputing your Ohms law calculations, but you are forgetting a major thing here.

If you put a 2 Ohm load on a Sony it will cause problems, often terminal. Irrespective of what the thing should do on paper, the Sony is ONLY designed to run at 4 Ohms.

Secondly - the output of the Sony when running correctly is vastly greater than the paper cones fitted to the Omega. The Ist generation Vauxhall speakers were raed at 8 Watts max, second generation rated at 15 Watts (common on the Omega) and when you consider that the Sony probably has a 50 Watt output, it doesn`t take a genuis to work out that the stereo can only operate at less than 20% of its capability before something goes bang.

2 very Basic car audio guidelines that are often disputed by the customer and then proven very quickly, at great expense..

1: Standard speakers are rated at a very low power, and if replacing the head unit with a high power (25W+), then the speakers MUST also be replaced to a comparitive output rating.

2: Vauxhall BOSE equipment IS NOT comaptable with ANY aftermarket head unit without the use of a complex interface to balance the audio signals.

 

[TheBoy]

Well I won't agree TheBoy with this last statement.
I know Bose is 2 ohm impedance and sony HU is definitely 4 ohm imp.
But if it is i high level Sony unit it will give some 27 watts rms per channel on 4 ohms.
If you use it on 2 ohm  speakers the power will double to 54 watts rms per channel theoretically.
It wont work well but can easily blow out old Bose speakers which cannot stand that amount of power either beacuse of age, design, etc.
BUT I also agree this isn't the way to go.
If you have Bose speakers and aftermarket HU throw them away and get a decent new pair of speakers

No, the sony amp will either self destruct, or go into shutdown

[TheBoy]

beaten by Dave DND 

[Dave DND]

Well I won't agree TheBoy with this last statement.
I know Bose is 2 ohm impedance and sony HU is definitely 4 ohm imp.
But if it is i high level Sony unit it will give some 27 watts rms per channel on 4 ohms.
If you use it on 2 ohm  speakers the power will double to 54 watts rms per channel theoretically.
It wont work well but can easily blow out old Bose speakers which cannot stand that amount of power either beacuse of age, design, etc.
BUT I also agree this isn't the way to go.
If you have Bose speakers and aftermarket HU throw them away and get a decent new pair of speakers

No, the sony amp will either self destruct, or go into shutdown

None of the aftermarket head units are 2 Ohm compatable and the Sony is the most sensitive of the lot.

 

[mathewst]

Not disputing your Ohms law calculations, but you are forgetting a major thing here.

If you put a 2 Ohm load on a Sony it will cause problems, often terminal. Irrespective of what the thing should do on paper, the Sony is ONLY designed to run at 4 Ohms.

Secondly - the output of the Sony when running correctly is vastly greater than the paper cones fitted to the Omega. The Ist generation Vauxhall speakers were raed at 8 Watts max, second generation rated at 15 Watts (common on the Omega) and when you consider that the Sony probably has a 50 Watt output, it doesn`t take a genuis to work out that the stereo can only operate at less than 20% of its capability before something goes bang.

I agree with everything you said Dave.
But only wanted to say that probably the speakers will go bang before the HU.
As for the speakers comparative output rating from memory when I wasn't sleeping during college classes    the speakers should be at least 30% more powerful than the amp running them to be on the safe side.

[unlucky mark mv6]

beaten by Dave DND 

Yep dave is the man who should know.

[Dave DND]

But only wanted to say that probably the speakers will go bang before the HU

generally yes, speakers go bang first, closely followed by head unit

With the exception of Sony - head unit can go bang way before speakers due to exceptionally low build quality nowadays. Even Sony seem to be admitting a serious issue, as rumour has it that they are planning to pull out of car audio completely in the very near future.

the speakers should be at least 30% more powerful than the amp running them to be on the safe side

A good margin - but remember not to go too high in power either. no point in 1000W speakers on a 20W head unit !!

As a rough guide a 50W head unit can happily run speakers around 90~200 Watts - anything over that and you should really start to look at a seperate amp.

[Dave DND]

Back to the original question in hand.

My views on BOSE are well known on this forum, and whilst a considerable upgrade 20 years ago when compared with the standard setup, it has not stood the test of time, and speaker / audio technology have move forwards in Giat leaps.

I also appreciate the requirement to keep the car looking original, but unless you are a real anal purist, that probably does not include the bits you cannot see (tune up bits, exhausts, suspension mods etc) in fact all the little tweaks you have made to make the car so much better nowadays, I really wouldnt bother with the BOSE.

By all means fit the head unit, screens, telematics etc, but for a really good sound, fit a very small four channel amp, something that can be hidden away in a cubby hole, and fit a good set of aftermarket speakers.

That way, you can retain the physical appearance of the car, but have the ability of blowing people away with the sound quality, especially those who still feel that BOSE has a place in the 21st century !!

 

[Kevin Wood]

By all means fit the head unit, screens, telematics etc, but for a really good sound, fit a very small four channel amp, something that can be hidden away in a cubby hole, and fit a good set of aftermarket speakers.
 

Agreed. This is what I did. 15 quid Alpine amp from Ebay (OK, did have to change a pair of MOSFETs that the DPO blew up). 

Hid the amp in the first aid box cubby hole instead of having that huge shelf invading the boot. Gets more airflow for cooling there anyway.

Reasonable pair of 6.5" aftermarket component speakers in the front doors and it sounds much better. Haven't even bothered to change the rear door speakers or fit parcel shelf speakers but I have 2 spare channels on the amp just in case.

Kevin

[tunnie]

By all means fit the head unit, screens, telematics etc, but for a really good sound, fit a very small four channel amp, something that can be hidden away in a cubby hole, and fit a good set of aftermarket speakers.
 

Agreed. This is what I did. 15 quid Alpine amp from Ebay (OK, did have to change a pair of MOSFETs that the DPO blew up). 

Hid the amp in the first aid box cubby hole instead of having that huge shelf invading the boot. Gets more airflow for cooling there anyway.

Reasonable pair of 6.5" aftermarket component speakers in the front doors and it sounds much better. Haven't even bothered to change the rear door speakers or fit parcel shelf speakers but I have 2 spare channels on the amp just in case.

Kevin

Might have to fit a couple of new speakers myself, passenger front has a bit of fatigue which can be heard at times. Just replacing the stock head unit to Alpine (9854R) in my case made a huge difference.

I always prefered the look and sound of Bose fit, but requirement for Aux in over rulled asthetics.

[TheBoy]

By all means fit the head unit, screens, telematics etc, but for a really good sound, fit a very small four channel amp, something that can be hidden away in a cubby hole, and fit a good set of aftermarket speakers.
 

Agreed. This is what I did. 15 quid Alpine amp from Ebay (OK, did have to change a pair of MOSFETs that the DPO blew up). 

Hid the amp in the first aid box cubby hole instead of having that huge shelf invading the boot. Gets more airflow for cooling there anyway.

Reasonable pair of 6.5" aftermarket component speakers in the front doors and it sounds much better. Haven't even bothered to change the rear door speakers or fit parcel shelf speakers but I have 2 spare channels on the amp just in case.

Kevin

Might have to fit a couple of new speakers myself, passenger front has a bit of fatigue which can be heard at times. Just replacing the stock head unit to Alpine (9854R) in my case made a huge difference.

I always prefered the look and sound of Bose fit, but requirement for Aux in over rulled asthetics.

If you really wanted the Bose setup (for whatever reason), you still have option of FM mods, Dave DND assures me that some of the better ones are actually quite good now

[tunnie]

By all means fit the head unit, screens, telematics etc, but for a really good sound, fit a very small four channel amp, something that can be hidden away in a cubby hole, and fit a good set of aftermarket speakers.
 

Agreed. This is what I did. 15 quid Alpine amp from Ebay (OK, did have to change a pair of MOSFETs that the DPO blew up). 

Hid the amp in the first aid box cubby hole instead of having that huge shelf invading the boot. Gets more airflow for cooling there anyway.

Reasonable pair of 6.5" aftermarket component speakers in the front doors and it sounds much better. Haven't even bothered to change the rear door speakers or fit parcel shelf speakers but I have 2 spare channels on the amp just in case.

Kevin

Might have to fit a couple of new speakers myself, passenger front has a bit of fatigue which can be heard at times. Just replacing the stock head unit to Alpine (9854R) in my case made a huge difference.

I always prefered the look and sound of Bose fit, but requirement for Aux in over rulled asthetics.

If you really wanted the Bose setup (for whatever reason), you still have option of FM mods, Dave DND assures me that some of the better ones are actually quite good now

I'll be willing to give them both a try if someone will make that adaptor loom for 2013's 

[Dave DND]

TB - a question for you regarding the CCR2006 / NCDCXXX

Knowing that not all NON-BOSE variants are able to have BOSE enabled via Tech2, can all of the BOSE-ENABLED ones have the BOSE turned off ?

 :-?

[Dave DND]

I'll be willing to give them both a try if someone will make that adaptor loom for 2013's   

FM adaptor loom not required for ANY head unit - all you need is a 12V supply - no connections to head unit or antenna are necessary

http://www.dndservices.co.uk/am-88t.html