Bimmerfest - BMW Forums - View Single Post - Sound System Improvement Stage One
View Single Post
Old 09-09-2011, 02:45 PM
Evlengr's Avatar
Evlengr Evlengr is offline
Ukemi - that's how I roll
Location: MD
Join Date: Feb 2007
Posts: 4,252
Mein Auto: 2013 Audi S4 2010 MT MCS
Originally Posted by deafwish View Post
Some help, thanks!
Is both the 4" midrange and 8" under-seat woofer a 100% fullrange or is there an in-line capacitors to filter some frequencies?
I somehow doubt that BMW would have a full range frequency going to the 4" door mids?!
If there is a cap of some sort on the 4" mid's wiring, running a pre-filtered signal to the 2 way split's input would create a serious compromise to their performance!
p.s. The underseat woofers are 4 ohm - not 2 ohm.
Weird, mine are 2 ohms I measured them in the shop and even says 2 ohms on them. Maybe a different set up because of EU?

I essentially by passed all things BMW except the speaker wires. I measured them with a fluke meter that gave both resistance and length. I then took a high end monster cable of equal length and measure resistive load. No difference.

The xover I used was home brew to give control on band pass. I took a xover from an old threeway speaker and put potentiometers to give adjustment control.

Some great news though. Focal has finally put out a nice set of 4" 100 mm that should fit based on depth and other measurements. The two I checked out ran $180 and $250 US dollars. Think I may go for a set and see how they work out.

I'll let you know. It will probably be about two weeks before Install them.
2013 S4 Loaded (and NO RFT's) Awesome is an understatement
2008 MT X3 RIP you were a faithful sidekick and will be missed.
2007 AT X3 RIPOS
2005 GC
2000 Jeep Cherokee
1997 Twin Turbo RX-7
1984 GTI Wolfsburg Edition Neuspeed and more

Last edited by Evlengr; 09-09-2011 at 02:52 PM.
Reply With Quote