Magnepan 20.7's & Tube Amp


Not looking for options beyond the two tube amps below.  I am only considering one of the two to drive my Magnepan 20.7's.  Would either drive the 20.7's well?  Do they provide enough bass? Is one better than the other for this application? Thanking those of you in advance who can assist me here!

PrimaLuna Dialogue Premium HP with KT150's / 88's as Monoblocks

or

Audio Research VM 220 Monoblocks

1985tqc
Ralph, is the need for the very short speaker cable unique to the planar/OTL combination or long cable inherently causes low frequency roll-off? I didn't think the cable length should be that detrimental given a 1.75 ohm output impedance on the MA-2.
The issue is that tube amps generally speaking have a higher output impedance than solid state. When you add a long speaker cable, the cable is a series resistance added to that of the output impedance of the amp. It may not seem like much, but fairly small resistances like that can have a big effect when the impedance of the speaker is already pretty low.

(This is one big disadvantage of 4 ohm speakers- the cable becomes really critical! You also have to make sure your connections are good and tight.)

So the simple solution is to keep the speaker cable short. I really don't think it makes a difference what tube amp is used (as long as it make a satisfying amount of power)- the speaker cable should be as short as it possibly can to make the connection. I think a foot is about as long as you want. I've heard this make a profound difference in the bass impact on several different Tympanis, MG3s, 20.1 and 20.7.

We use 10Gauge copper OFC speaker cable, using both conductors joined together at both ends by a single heavy speaker lug.  So we have to build up four such jumpers but it really pays off.

A Big high current solid state amplifier would have much better grip, control On the Panels.
I don't find this to be the case. What seems to be happening is that the lower output impedance of higher powered solid state amps allows more leeway with the series resistance of the speaker cable. We've been running fairly high output impedance amps on Maggies for decades and they seem to 'control' the panel just fine with plenty of bass impact. So I regard this as a common myth, caused by a misunderstanding of how critical the speaker cables become when you run 4 ohms and use tubes. Put another way,  if you compare a tube and solid state amp on the Maggies and you also have longer speaker cables, its likely the solid state amp will have more impact. But if you use really short cables the differences between the amps will be less profound. 
Have you looked at the Carver 350?  They're supposedly amazing with the 20.7's.
I bought a pair, but haven't hooked them up yet.
I am just curious as to what they can do, considering what Steve McCormack said. SMc just made me a pair of monoblock DNA-1's with the express design to outdo Ralph's MA-1's (hey, they get too hot in summer). We'll see....
When things get settled in, the Autoformers will be an interesting experiment.
B
I Just spoke to Wendell Diller at Magnepan and reducing the speaker cables has zero affect unless your running 15-20ft of cable. I don't know why we get all this misinformation on Maggies. I use tubes 110w and they rock. I traded in my ARC DS450M monoblock for ARC REF110 and my 3.7i never sounded better. Please stop the madness and enjoy your Maggies.