The Merlin VSM is a stunning loudspeaker that can be easily driven by most medium-powered tube amps, and it seems to especially like OTL's. Nope, I'm not a Merlin dealer - just an admirer.
Source Technology 8.2DX --- its 36 x 9 x 11 excellent fit n' finish and it sounds glorious -- I purchased it over the Von Schweikert VR2 - you didn't give a price range - its $2500. The speaker is so new the picture and specs are not on their website. I bought mine from the Source dealer in FL .........LouFink@bellsouth.net (954-648-2118)
Lou is a great guy and extremely knowledgeable about audio. Carries other speaker lines as well.
Best of Luck