Looks like 4" to me. Not sure about mounting depth though.

http://m3forum.net/m3forum/showthread.php?t=150423

 

thanks joylove, good find

theres not too much info to be found online about this, maybe i will just take the pannel off and see what i have

thanks again

 

the selction of 4" components are pretty poor,

i dont think i really wanna spend over £100 for them, as they are only really to upgrade the crappt rear stock paper BMW rubbish

 

Are they in the same place as an E36? I managed to ram some 6 x9's in mine. And the OEM covers still fit. Had to hammer and grind a little. But was worth it, Still get decent sound at 70 MPH with the roof down.

 

that looks like a tight squeeze lol

they are sort of like that,

but they stock speaker mounts a tad lower than yours i think, i will pull that part with the arm-rest off tomorrow, and post a pic

 

The 4" ones i took out was in a big plastic mount, This on its own took up a fair bit of space. Once this was removed it was easy. Could of got away with no grinding or hammering if i was gonna cut the card and put the aftermarket grilles on. But wanted it to still look stock. Had to get them mounted a little deeper for this.

 

I have some Mac Audio 100cms in my rear of an E36. I had them from a previous install. I would have been open to leaving them unplugged and leaving the soundstage in the front.

 

yea i have considered doing that, and have done for a while via the fader on the HU,

but it does sound better with the rears even with the bias to the font