MBL 9011 v/s Boulder 2050 monos

Your question is really hard to answer. One of these amplifiers might sound better in your system depending on your speakers and preamp.

The best thing you can do is to try to borrow one of these amplifiers and listen for yourself.

What is the rest of your system? Perhaps the amplifier you are currently using is more than up to the task and there is something else in your system that needs to be changed.

Sthekepat:

The MBL sounded more warmer and softer but with higher extension on the top.

Well, your quick comment is reasonably close to my experience with Tannoys above. Only, I did not detect the same anomalies in the bass region from the MBL. Hence, I preferred the MBL in that application. I would probably prefer them driving the Kharma's ceramic driver set-up -- but am just speculating.

Has anyone compared the MBL 9011 v/s 9008A s ?
Would be interesting to hear the sonic differences !!

I would consider different i/c before I switched out amps since Nordost has some serious issues. The sonic flavours are very different cable to cable and would be a to hear new sounds from the same amps. Hope this helps Dennis

Given the preferences you list, Sthekepat, you sound like a prime candidate for MBL speakers. Given that you already have the preamp, I would take a good listen to the 111 or 116 speakers coupled with the 9007 amps. They together would clock in at a lower price than the 9011s alone, and I'm absolutely certain it would give you the improvements you ask for. :)

Now, if you have a large room (35-40m2 or larger) you really want the 101 speakers, but they are a bit expensive, and also want the larger amps like 9008 or 9011.

To my ears, 9008 and 9011 sound a bit bass-heavy when played on other speakers than the 101, which is what they were designed for. So if you want to couple these to other speakers I strongly recommend an in-home demo.