Posted by JimL on January 10, 1999 at 13:40:27:
In Reply to: Re: Aftermarket Audio for E39? posted by Bob Hazelwood on January 08, 1999 at 01:42:22:
I managed to remove and disassemble the subwoofer unit from my premium sound system (thanks Jim Cash!). It looks like a bandpass box design (see the Crutchfield link below) and is built by Nokia. hmmm... I like their cell phones, but I don't know about their hi-fi. Inside the sub box, there are two 4" paper cone drivers, each with dual 8 ohm voice coils. What a piece of crap! No wonder it sounds so un-musical and distorted!
To Bob Hazelwood: Is there any chance of improving this sub-woofer unit by replacing the 4" DVC drivers and leaving everything else intact? Or maybe the thing to do would be to ditch the entire thing and build a new enclosure around your 310rs speakers. Do you have any application notes on enclosure design for your subs?
Any light you can shed will be greatly appreciated!
: You have been misinformed about the difficulty of upgrading an E39. You do NOT have to upgrade the audio after the factory amp. THis is costly, complcated, and basically just asking for trouble. It will not work. The best place to pick up the signal is BEFORE the BMW amplifier, where it is a standard 4-channel common ground signal. Simply plug this into any aftermarket amp which can handle a 4V signal. No problem, No noise. You can even use ALL of the already installed BMW wiring for signal to the new amp and from the new amp and the speakers. If the installer knows what he is doing, the E39 actually is one of the most simple vehicles to upgrade on the market. If a dealer tries to tell you differently, don't let them get anywhere near your car. They don't know what they are doing.
: See our site at http://www.adst.com for a few ideas.
: Best regards,
: Bob Hazelwood
: VP Product Management, a/d/s/
: '93 525 5-sp, BL/ss'd, Sharked, etc.
: BMW CCA (Boston)
: : Ok, so even with the premium audio I STILL didn't like the way the stereo in the 540i sounds. Sad that BMW gets EVERYTHING else right and then puts in a stereo that is blown away by what's in a Caddy Seville.
: : In any case, I took the plunge and upgraded the stereo. What an ordeal! You must hook the sundry equipement AFTER the BMW amplifier... Mind you this entails 12 channels of amplification (separate channel for each speaker driver). But it's still not right, the noise levels are too high! Does anyone know of a way to put an aftermarket radio in an E39 without completely trashing the dash and losing telephone functions? I remember Sony doing a concept car using an E39 but can't find the article ANYWHERE!