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View Full Version : 94-95 stereo upgrade ... on teh cheap.



paul p (chi-town)
09-01-2008, 06:17 AM
As mentioned by Attack Eagle and others, the 94-95s e34s do not have the separate passive crossover & amp section. This presents problems with a budget aftermarket install.
In my case the amp went out completelty ... so just slapping in the head unit didn’t work (of course i woulnn't be bothering if stock werked). Sending raw speaker signal to all 10 is a recipe for crap sound at least, blown tweeters at worst so no h/u hack in.
You can scavenge the old style connector from the amp box (which sends to the main drivers f & r), but the newer 26 pin (head unit, tweet/mids) is difficult to solder with decent thickness wire.

Eventually i’d like separate amps, but for the moment a Clarion 745 puts out pretty clean and powerful.
To split the signal for the component speakers i cobbled together a passive crossover and spliced it in where the amp was. Just some caps to keep the bass from the mids & tweeters, no coils to roll of the highs ... yet.
Gotta play with it some, but it sounds pretty good so far.
A definite improvement over stock and with a bit of tuning a bit more volume is surely available.
While i’m tempted to do a sub it isn’t necessary like in the NX or MR2.
The stock drivers are poly coated, the fr mids are paper and the tweets are ‘silk’. Comparing the woofers to same size Kenwoods i had left from teh Volvo the bmw has a bigger magnet, unless one is getting really high end sh!t, stock are more than adequate imho.
Oh and free.

Pictures and cap/coil values when i finish sorting this out.
The Clarion is a hand me down so the upgrade has been $30 at Radio Shack so far. Some higher quality hardware and this might crack $50. ;-)


Hang up & Drive!
94 BMW 530iT&A 140K, ‘Helga’ ( Boat bus, mit musique ... nonstop )
92 BMW 325i 150K, ‘Rolf’ ( WI deer survivor *whew* )
93 Datsun NX2000 185K ‘Carla’ ( RUST, that’s charact.....ok fine, it’s a beater *shakes head* )
85 Toyo MR2 130K ‘Jerry’ ( museum piece / track toy / 28mpg *grin* )
“If everyone is thinking alike, then somebody isn't thinking. “
- George S. Patton
Bob Barr 2008 (http://www.bobbarr2008.com/splash/?s0618)

Tiger
09-01-2008, 08:35 AM
Why don't you just bypass the amp and use the crossovers inside that amp unit? 1994 and 1995 is not any different from others... other than the headunit wirings in the older E34.

attack eagle
09-02-2008, 03:32 AM
incorrect tiger.

94-95 have active x-overs and a 5 chip 10 channel amp, no passive board + 4 channel to hack.

http://sig1.euromotives.com/i/ebay/f/1174759453.jpg

http://sig1.euromotives.com/i/ebay/f/1174759452.jpg

I suppose it might be possible to hack in an older style amp's plug and then do the bypass but I don;t have a 94-95 so I won't be gunea pig on that one.

alternatively you could pick up another amp from a yard or ebay.

You did check the fuse and amp turn on lead... right?

Tiger
09-02-2008, 09:32 AM
Oh... mmm... My Sanyo HD radio unit works great with factory amp. Pretty cool. Used factory amp is cheap to buy. Full blown system cost alot of money.

Elekta
09-02-2008, 04:04 PM
why not just replace with the oem on the cheap....some inquiring folks could just ask the board to see in anyone had say, an extry head unit in the garage. Or just send the broken stuff to www.soundrepair.com and have them rebuild said broken stuff to brand new spec for about $95 a unit incl shipping.

;)

I don't have the amp, but I have a couple head units laying round from my busCD43 change over.

paul p (chi-town)
09-02-2008, 11:18 PM
incorrect tiger.
94-95 have active x-overs and a 5 chip 10 channel amp, no passive board + 4 channel to hack.
I suppose it might be possible to hack in an older style amp's plug and then do the bypass but I don;t have a 94-95 so I won't be gunea pig on that one.
alternatively you could pick up another amp from a yard or ebay.
You did check the fuse and amp turn on lead... right?

Bingo ... open it up and it's all circuit board and small components,
not like this

http://i18.photobucket.com/albums/b106/AttackEagle/audio%20gear/100_1132.jpg

That i would have hacked in like 15 minutes.

http://sig1.euromotives.com/i/ebay/f/1174759453.jpg

The old style plug on the left was no problem and i just tapped to the back of the connector, which can be separated from the amp box. But the one on the right was just too messy trying to get decent thickness wire on. Still, that takes care of connecting all four woofers with a single ‘click’ and i only had to connect the mids/tweeters and head signal in the car.
Still working on pictures.
The sound quality is almost as good as stock (i definitely need to tweak the x-over), but it can get noticeably louder.
If anyone can read off the capacitor values from the older style x-over ... that would rock. Or even frequency roll off suggestions would be appreciated.

Yeah i checked the fuse and connector ... it was an intermittent loss of sound that just got worse. Once i opened up the box i could see corrosion on one of the amps (just inside the heat sinks). One way or another i was antsy to get a CD player in the dash, the CD43s are still to dear so are Nakamichi. The clarion has tunable illumination that fits right in and reads MP3 disks too. It’s not quite as ‘stealth’ as a 9255 or a Naka but it’s close.


"I would rather be exposed to the inconveniences attending too much liberty,
than to those attending too small a degree of it."
– Thomas Jefferson

paul p (chi-town)
09-02-2008, 11:41 PM
Ah ... Guapo saved me the effort.
Clarion 745

http://guapozx.com/gallery/d/16750-4/IMG_1976.JPG

http://guapozx.com/gallery/d/16753-4/IMG_1978.JPG

It’s a little tricky in bright sunlight as the amber color uses 100% red with a 10% green and no blue, but other than that it really looks appropriate. Buttons are a little small but the main ones are easy to find by feel. For all practical purposes it’s the top of the line, the 8XX and 9XX series buy more features, but the SQ specs are the same.


“When the going gets weird, the weird turn pro."
- Hunter S. Thompson

paul p (chi-town)
09-04-2008, 02:28 AM
Ok, haven’t had a chance to photo DIY X-over but here is the 94 amp.

http://pavlo.interaccess.com/bmw94amp.jpg

(Xcuse the crap ipHone pic).
None of those components are meant to ‘filter’ full speaker output voltage


"Graze on my lips and if those hills be dry, stray lower....where the pleasant fountains lie."
– William Shakespeare

attack eagle
09-04-2008, 01:10 PM
yep no caps and coils.

http://i18.photobucket.com/albums/b106/AttackEagle/audio%20gear/100_1132.jpg