Amplifier Choice

Make and model Gradient Revolution MK IV
Frequency response 50-20000Hz +/-2dB, -6dB@30Hz, high frequency limit above 50kHz
Impedance 6 Ohm, minimum 5 Ohm
Radiation patterns Bass: dipole, midrange & treble: cardioid
Drivers 2×300mm long throw woofer, 176mm fibreglass midrange, coaxial aluminum dome 25mm
Sensitivity 87dB/2,83V/1m
Recommended amplifier power 50-250W
Crossover frequency 200Hz and 2800Hz

The data on speaker.
Is M2x enough power ?
 
I believe it is.

It will depend how loud you listen.
It probably wouldn't be powerful enough for a drunken 18 year old's birthday party, but certainly powerful enough for enjoyable levels in an averaged size room.

Aleph J won't be the most appropriate amp for this speaker.

M2X
M2
F6
F4 with decent preamp
BA2
BA3
F5
F5 Turbo
 
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I'm partial to the F4, a big burly power buffer. Has a better damping factor than some of the other choices, and decent power at 4 ohms. Doesn't have a "sound", it simply passes on the qualities of the linestage in front of it. What's better than a diy project? A second one!! There are lots of great linestage projects out there... You'll need one with plenty of gain though.
 
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They are 8ohm speakers and I have been driving them with 2 Arcam Alpha 8 amps one intergrated one power. My CD player is an Arcam CD 92 with a Tent Labs clock installed.

Well My friend you will find that Even a decent (US designed / built) LM3886 Amp will Shame the Arcams (I did) and the Firstwatt (likely any) will genuinely outperform the LM3886 . Stop dithering and Pick one 😀