 mormel:
 mormel:
about the MS150's: The high's can get pretty agressive plugged in to modern sources (CD players/MP3's).  
 
To get rid of the aggressive highs:
 
Have you tried/considered changing the capacitors that feeds the signal to the tweeter (and midrange) units to a better, “audiophile” type?
 
Though I must admit that I haven’t done this on MS150s, I’ve had very good results with other Beovox speakers (S75, S45-2, S30 type 6301): 
The highs loosen up, gets much better defined and more “airy” – and less massive/aggressive.
 
On the MS150 it’ll be about to change:
·      1 x 33 uF cap in series w the midrange unit 
·      2 x 6,8 uF caps in series w the tweeter 
(resp. C12, C13 & C14).
 
I’ve used Jantzen Cross Caps but others offer good audiophile caps as well.
 
Less than 25 USD + half a hours DIY-work a side could get you a much better sounding Beovox - 
										    
									     
									    - Claus
Beolab 5000 (x2), Beomaster 2400-2 & 5000, Beogram 2400/MMC20E, Beovox S30, S45 & S75, M75 - and growing...