Looking for great tube integrated for Martin Logan Summit X speakers

Here is a review of the Summit X by Absolute Sound's Noel Keywood.  In the measured Performance section he states, " Valve amps with a 4 ohm output tap are a good choice..."
https://www.absolutesounds.com/pdf/main/press/ML_SummitX_HFW.pdf

Here is a review of the PL Dialogue HP Integrated by Stereophile's Robert Deutsch.  He states, " Ever since I reviewed PrimaLuna's ProLogue Premium, for the June 2012 issue, it has been the model I would turn to when I wanted a moderately priced integrated amplifier to try with a new speaker. It never disappointed me, and never seemed outclassed, even when the speaker was the Martin Logan Montis ($10,000/pair)."   The Montis has an impedance of .5 ohom at 20khz.  And the HP version has more output transformers that the standard Premium model. 
https://www.stereophile.com/content/primaluna-dialogue-premium-hp-integrated-amplifier

Here is the Montis impedance chart:
https://www.stereophile.com/content/martinlogan-montis-loudspeaker-measurements

Listening to the amp with my Summit X speakers, it is indeed very nice.  

The only problem you say your getting, is with "T" "C" "S" sounds

I have a friends with Summits, both series 1 and 2 "X" None of them experience any sibilance at all, in fact they are all very transparent and delicate in the highs, as are my own Monolith III’s with the newer Neolith panels. If I ever had to get rid of the huge Monoliths, the Summit’s are what I would get instead. the speaker is innocent, look at what driving them.

Here is what John Atkinson said about the strange HF peak which starts it's rise at 8khz in the measurements.
" Note the peak between 30 and 50kHz in fig.1. This peak was at its highest from both taps into 8 ohms and higher impedances, but disappeared when the load impedance was well below the nominal transformer-tap value. But with the tap matched to the load, this peak was associated with a significant amount of overshoot on a 1kHz squarewave (fig.2), though a 10kHz squarewave revealed that the consequent ringing was critically damped (fig.3), the amplifier maintaining its stability."

Cheers George

The guy still wants to argue a point he thinks a graph will prove.look at the words spoken by the reviewers george. 

They were John Atkinson words sunshine, he knows more in his little toe than you’ll ever know. https://forum.audiogon.com/posts/1701980

I decided to call Rogue Audio this morning and ask them about their Chronow Magnum III integrated, and how it would do with Summit X speakers.  The gentleman I talked with was very knowledgeable and helpful.  He said that they have a massive linear power supply and not to worry about impedance.  They have many customers with challenging speakers like the Summit X with impedances that go down to 1 ohm and have no issues.  The Magnum III weighs 55#.  The PL HP has more tubes and weighs 66#.  They both claim massive output transformers.