I can't speak for the 5 or 9s as I've not heard them but can say that I prefer the sound of Beovox's to the any of the labs that I have had - however, the larger the Beovoxs are the more they need the right front end.

S45-2 connected to the B&O Passive sound great and better than the Beolan 4000's I had. M100-2 conneced to the same sound good but a bit week - swap the passive amp for a Linn LK140 and they start to sound great, swap that for a BM4400 and they are awesome. Penta's are good but I found them wooly compared to the M100's in the right setup.

Of course, everyone will have different opinions and it will depend on how loud you like your music, the room that you play it in, neighbours, furnishings the amount of bass you want, design etc. At the end of the day is all you can do is go on is what works for you.

I didn't believe it before listening to many combinations, but my Beomaster 6000 quad with Beovox M75s and S45s beats all of the newer Beolabs connected to different amplifiers up to the 9s to my ears. M75/100s are great passive speakers in my view. The Beomaster 6000 quad is sonically unjustifiedly discredited on here but that's a different story.

Cheers, Kai

Yes, I have my BM4400 with M100-2's as front and P45's wall mounted as rears with the Ambio switched on - sounds amazing. 

It's good to hear that you enjoy your BM4400 with the ambio function on. Whenever I use the ambio function of my BM4000 without the ambio filter awitched on I usually detect annoying sibilance from the rear speakers esp. when I listen to classical music. It's inexplicable why B&O omitted the ambio filter although they retained the ambio function with BM4400.

Milton

Have little B&O left but still have my BM4401 and M100-2s. Lovely combination.

Yes, took me a long time to get there but very happy with the combination and lots of experimenting with different amps and speakers. In the end I bought a fully serviced 4400 and the M100-2's only had one previous owner but just needed the filler driver repairing. I then had my BG4002 serviced and setup properly and a recon cartridge. So hopefully will be able to enjoy them for many years. Anyway a good way to spend the evening listening to music with a glass of wine.

Not surprised you hung onto the 4401 - very very rare and beautiful.

Have a BG4000, 4004 and 4001(!) to use with it. The 4000 is my favourite  as I think the design is the best. I cannot tell the difference sonically!