Sound System Improvement Stage One

Originally Posted by Bufalo

Anyone ever do true measurements of rear clearance on the front speakers? Crutchfield has Boston SE45's on sale right now, and if they fit, I'm making the move. I've had BA speakers in most of my cars, and I'd love to do the same in my recently acquired '07 X3. I like the way those Earthquake subs fit right into the stock "enclosures," I think I'll be doing a simple system of four 4" coaxes and a pair of those 8's running low midbass and semi-sub. Should be fine as an upgrade over stock, which I've quickly grown to dislike!

2 and 1/8 is the most, but that is not the real issue. The size (diameter) of the magnet is the thing that is hard to measure. There is a gentle slope to the metal directly behind the speaker placement.

I know these will fit:

Alpine SPS-400 and 410

Infinity Kappa series (older ones) with neodymium magnet.

Focal v100 low profiles.

I have heard the BA will fit (very snug) but fit. I can't say for certain as they do use a very large magnet. BA's are my favorite sounding speaker so I would go for it if you can return them in exchange for the Alpine's are they are close in sound to BA. Not harsh but nice even tone and very good imaging for their price point.


That will be a very nice set up.

PS nice to see people taking this step. 4 years ago when I first mentioned changing the sound system in the X3 I was considered some sort of Pariah and lots of negative comments. Now I see many people realizing they can do so much better for very little money.