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Bavarian Soundwerks' Mobile Electronics Forum
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Old 01-23-2009, 02:03 PM   #1
royalratch
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Professional CD Spec

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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Old 01-23-2009, 02:59 PM   #2
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What exactly are you looking for, power ratings? a subjective evaluation of non-amplifier vs. amplified?
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Old 01-23-2009, 05:12 PM   #3
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1) How is it different to a Business CD.
2) Is there more to it than just the head unit.
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Old 02-01-2009, 03:45 PM   #4
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Anyone?
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Old 02-03-2009, 07:26 AM   #5
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Old 02-04-2009, 06:36 AM   #6
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Quote:
Originally Posted by royalratch View Post
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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Old 02-04-2009, 06:43 AM   #7
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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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Old 02-04-2009, 06:50 AM   #8
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You can connect the alpine amp to the oem head unit using an adaptor, regardless of what unit you have.

Quote:
Originally Posted by royalratch View Post
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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Old 02-04-2009, 06:54 AM   #9
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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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Old 02-05-2009, 04:12 PM   #10
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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.

Quote:
Originally Posted by royalratch View Post
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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Old 02-09-2009, 06:29 AM   #11
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And the Prof CD spec?
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Old 02-09-2009, 10:15 AM   #12
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I am guessing it is a Business CD with a built in amplifier for powering the speakers. I would guess ~10-15W per channel at the most.
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Old 02-10-2009, 01:54 PM   #13
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Originally Posted by Halston@BSW View Post
I am guessing it is a Business CD with a built in amplifier for powering the speakers. I would guess ~10-15W per channel at the most.
Confused.

All BMW stereos have an amp built in, only the HK set-up has an outboard amplifier.
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Old 02-10-2009, 02:11 PM   #14
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I am talking about the unit that directly powers speakers. All US cars have an amplifier in the trunk from BMW that powers the speakers.
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Old 02-10-2009, 02:51 PM   #15
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My E46 was non HK and had an external amp in the trunk.
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Old 02-10-2009, 03:59 PM   #16
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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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Old 02-10-2009, 04:23 PM   #17
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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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Old 02-10-2009, 04:50 PM   #18
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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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Old 02-10-2009, 05:05 PM   #19
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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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Old 02-10-2009, 08:30 PM   #20
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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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