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Discussion Starter #1
Hi all.

I have a 2003 320d SE Touring with a Professional CD installed from new.


Just wanted to know what the difference was with other BMW units?

I have the standard 6-speaker set up,don't even know if I have an amp.

I don't have the HK set up- that I do know.

Any info would be good.
 

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1) How is it different to a Business CD.
2) Is there more to it than just the head unit.
In US, we do not have the non-amplified radios, so I can't comment on it. If you only have sis speakers, my guess is you have a non-amplified radio. Why are you asking, are you looking to upgrade the stock system with a higher-end stock system? - don't waste your money.
 

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Discussion Starter #7
Not being funny but it doesn't matter why - I just ant to know how they differ.

Power/features etc.

I'll try some UK forums as you said, lesser known in the US.

Regarding upgrades, I'm going to go the Blaupunkt Plug/Play route and drop in a small digital amp with OEM loom.

I have a brand new Alpine 2 channel amp but it will be too much hassle to plug into my stock set-up (nor pre-outs for factory) and I don't want to change the HU.
 

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You can connect the alpine amp to the oem head unit using an adaptor, regardless of what unit you have.

Not being funny but it doesn't matter why - I just ant to know how they differ.

Power/features etc.

I'll try some UK forums as you said, lesser known in the US.

Regarding upgrades, I'm going to go the Blaupunkt Plug/Play route and drop in a small digital amp with OEM loom.

I have a brand new Alpine 2 channel amp but it will be too much hassle to plug into my stock set-up (nor pre-outs for factory) and I don't want to change the HU.
 

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Discussion Starter #9
Pre-out converter from standard speaker output right?



My Alpine won't fit anywhere other than the loadbay and I'm not into that.

Would still like to know about this 'Pro' HU...
 

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If you do not have an oem amplifier, pretty much any adapter that can handle speaker-level signals will work. If you do have an oem amplifier, you need an adapter that can take balanced-differential signals.

Pre-out converter from standard speaker output right?



My Alpine won't fit anywhere other than the loadbay and I'm not into that.

Would still like to know about this 'Pro' HU...
 

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Discussion Starter #16
I have a factory Professional unit and no amp.

So how can a 'lesser' head unit, like a Business CD say, power speakers without an amp?
 

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I was under the impression that all the BMW stereos have built-in amps. If I remeber correctly the Business units have a 10W per channel built-in amp and the Professional units have 20W per channel built-in amp. I also think the Professional units have a larger/more detailed LCD display. I believe the reason all US spec. cars utilise an external amp in the boot is to power the additional speakers, even on the non-HK units. In the UK all units Business and Professional (non-HiFi and non-H&K) only have 4 mid-bass and 2 tweeters connected which the built-in head unit amp can handle. I think, but not sure about, the all US spec. cars also have an additional 4 mid range speakers, makeing 10 in total compared to our 6, hence the need for the external amp. The HK system has "upgraded" speakers and a sub-woofer fitted. I am sure someone with an HK system and more knowledge of the various BMW audio systems will chip-in to confirm or correct.
 

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Discussion Starter #18
Now we're getting somewhere - this would make sense. My Pro stereo does sound better than my old Business one but not massively so.
 

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I have the Business CD unit and swaped out the BMW speakers for some half decent Alpine ones. 6.5" 2-way coaxles in the rear deck and 5.1/4" components in the doors. The Alpines have much larger magnets and suck more juice from the already weak built-in amp. Far clearer and richer sound, but I need to crank up the volume knob to get a decent volume level. As such the max volume is now lower but not, that I have ever maxed out the volume anyways. Given the Professional unit has a better and more powerfull built-in Amp it will cope better with decent speakers attached. I also noticed by changing the speakers that the bass gave much crisper thumps. Much improved but a small self powered sub would top it all off nicely, without the need for any great expence.
 

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All the headunits have built in amplfiers, at the moment my car with the standard hifi system is powered by the Business CD headunit.
 
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