I have a couple MX-1000, black and yes, it is a beast, 260 watts and rated to 2 Ohms.
I saw a 1000 for sale a month ago, but the 10000 are so rare.
And pity only around 250 MX-10000 were made.
MX-10000 Specs:
Minimum RMS power output (20Hz...20Khz, 0,001% THD) :
2x 250W (8 Ohm)
2x 300W (6 Ohm)
2x 400W (4 Ohm)
Dynamic power output (1Khz, 0,001% THD) :
2x 350W (8 Ohm)
2x 450W (6 Ohm)
2x 600W (4 Ohm)
2x 900W (2 Ohm)
2x 1200W (1 Ohm)
Damping factor : 1000 (6 Ohm, 1Khz)
Through-rate of pre-driver voltage amp : 500V / µs
Frequency response : 2Hz...300Khz (+0 / -2dB)
IHF-A S/N ratio : 132dB
IHF-A residual noise : 10µV
Channel separation : 90dB (20Hz...20Khz)
THD : 0,0005% (20Hz...20Khz ; 6 Ohm ; 1/2 rated power)
Inputs : 1,5V / 25kOhm
Dimensions : 47,5 x 22 x 54,3cm
Weight : 43kg.