I agree with Martin. If you can live without remote, a 4400 is a lovely amplifier - I use a 4401 with my M100.2s though I do have an 8000 as well. The 8000 has the advantage of remote control though I do have an Amazon Dot attached to the 4401 so I can use that via voice control. The 8000 is the more powerful and was built as an example of what B&O could do. The 6000 is actually quite similar to the 4400 in electronic terms though again has remote control. It is however not as reliable - more to go wrong!

I am actually testing a reconditioned Beomaster 4400 right now and have it connected to a nice pair of M100 speakers in a listening room...so ditto on that suggestion. It sounds great. 

-sonavor

To throw a different suggestion into the mix I have used my M100-2s with a variety of amplifiers:

Beomaster 4400 - as the others said very good

Beomaster 6000 - old type - I liked the sound of this one but the volume control broke and there were other issues with it

Beomaster 6500 - sounded a bit dull and unexciting

Beolink Passive - ok but lacked any punch

Linn Wakonda and LK140 - very accurate but slightly dull sounding compared to 4400

Valve amplifiers - various - you need to make sure you get one with high power output (KT88's) - this makes them sound amazing, particularly with Jazz - but no control over bass - I found mine to be too bassy but then I have a wooden floor under the carpet. That said there is a sound from valve amps that becomes addictive and, to me personally, much better than solid state. 

Yamaha CRX-470D - not enough power so sounded weak

Currently I used them with a Yamaha N-602 which gives me streaming, internet radio, phono input, remote control etc. etc and everything sounds very very good indeed. Loads of power and a very full enjoyable sound. I might try at some point connecting this to a Valve Power Amplifier

In summary, whilst it is all a matter of what you particularly like, the M100-2s I've found to be really revealing speakers with superb sound - they will show up the good and bad points of any amplifier and need a lot of power.

Why not give a try to the beomaster 5000 from the 80ies.

It has many advantages. It has a remote control, several inputs jacks.

I don't believe that the sound of amps differs a lot.

:)

Regards Chris

Hi all,

Thanks a lot for your comments.

Relating to what Andrew said here about the M100's needing a lot of power.:

I looked at the 4400 and the ouput it 2x 75 W at 4 ohms. The M100's are actually 150W at 4 ohms or 100W at eight ohms. I thought that generally speaking you need an amp that is able to do more than the speakers, so perhals then going for a 2 x 200W amp?

As to the particular suggestions, what do you think gives the most clear image, a lot of space. What I mean by space is I guess that the instruments can be heard distinctively seperate from each other?

The 4400 drives them perfectly well and in any case there is an overload circuit on the speakers and beomaster to prevent any damage.

You need an amp with sufficient power otherwise you just wont get enough volume out of them and likely to distort as it reaches its limits. That said they all differ, the Valve Amps with say 40watts are really loud and i heard no distortion - much louder than the claimed 40watts a channel from the cheaper Yamaha unit I tried. My new Yamaha receiver is about the same wattage as the 4400 but sounds much louder. 

The whole thing as to which sounds better is so subjective and throw aesthetics into the mix and that changes everything again. There is also the fact that any old receiver/amplifier is likely to have lost the performance it would have had when new and so will need restoring. I think you will need to decide wether or not you want remote control or not and wether this is compatible with Beo4 or not, if you want something to match the speakers or if you want a new amplifier that is not B&O.