Schief,
Look at Big Worms second link on how to install the cd changer- the aftermarket MP3 hard-drive jukeboxes such as Dmp3 and Phatnoise will go in this same location. I haven't installed one yet, but I'm leaning toward Phatnoise.. only problem $859 bucks for the 20 gig unit is a little steep :-(
But it does integrate with factory steering wheel controls
William 330,
1. Yes they did. Yes I agree they are bastards :-( The BMW system is 2 ohms which is why nothing except the head unit is compatible with anything aftermarket (which is standardized at either 4 ohms or 8 ohms).
2. Diamond has been around for years, but they cater only to higher end so you won't see them 'around' in say Circuit City.
3. Yes, to get good sound out of paper, you would have to spend 10 grand ;-)
Everything I have read in the past 4 months on searches like 'speaker materials' in Google EG, is that paper is an inferior material which is not used anymore except on factory stereos where it is only used bc it is cheap...
This has been confirmed and reinforced by high-end car stereo shops here in the Bellevue/Seattle area. And by other 'vendors' such as crutchfield.com.
This link at Crutchfield explains in more detail why paper is inferior for woofers, mid-bass, and tweaters respectively:
http://www.crutchfieldadvisor.com/S-mqztb82Sh6Z/learningcenter/car/speakers.html
Paper was used in the past since there was no other solution, and yes, getting good sound out of it required extremely costly coatings and treatments, but now there are better materials which are mass produced and feasable for production...
4. On subs the first thing that comes to mind is get a good one. My suggestion before was to spend heavily on the sub/amp/and speakers. If you cut corners anywhere get cheaper coaxials for the rear, but DON'T go cheap on the sub/amp/or front speakers.
Go to a CAR stereo shop and you will see just how far superior the sound quality when there's a sub in the car.
BRING YOUR OWN CD TO LISTEN ON MULTIPLE SYSTEMS.
This is very importand as it gives you a 'standard' to compare with.
With CAR stereos, the speakers are much smaller and much less powered than a home stereo, also the music stage has to be set in a far smaller area. So when researching car stereos remember that it is not at all the same as home stereos. You actually CAN get good sound in a home stereo without a sub, but in the car, entire instruments will be just plain MISSING.
I used the same CD to demo before and after I got the sub and the difference was 'night and day' better with the sub, believe me I didn't want a sub either(esp. since I cannot stand boom boom cars), but after I heard Sting and Madonna with a sub and heard new instruments that I hadn't heard before, I just couldn't go back...
One note I will make is that you have to have the sub tuned for your system for it to enhance the sound. The frequency cutoff has to be matched to your other speakers and this is a very important step. This is done at the crossover, then fine tuned on the amp...
Also, if the sub is tuned too strong or too low or high, you will not get optimal sound out of your system as a whole.
Again, all I can say is Go and Listen...
And go to a professional shop- don't 'do it yourself' if you want it done right.
And use your Own CD for ALL COMPARISONS.
That being said, a sub is hidden in your car. It is in the trunk, and if you wish, is quite easily removable ;-)
My interior looks 100% stock, and I won't have it any other way.