Here is a new power amplifier from Holton Audio, the NXL1000.
Capable of up to 1500 watts RMS continuous sine wave into 2 ohm loads or it can be operated on lower supply rails to drive even lower impedances!
The amplifier board measures 360mm x 63mm. it can be powered from a https://micro-audio.com/store/product/cobra-s2 SMPS or for the more discerning and the abilities to drive loads lower than 2 ohms continuously the use of a 2KW linear power supply per channel would work well..
The output stage uses 12 super rugged Exicon dual die lateral power mosfets, which in turn are driven by a pair of 36 watt SMD power mosfets mounted on the underside of the main PCB for an iron grip on the output stage Gate's.

NXL1000 R2 Specifications

• 450 Watts continuous sine wave into 8 Ω
• 750 Watts continuous sine wave into 4 Ω
• 1500 Watts continuous sine wave into 2 Ω
• The NXL1000 R1 is 1 Ohm Stable
• Biased into Class A/B
• Power Bandwidth 3.5hz to 250khz -3dB
• Damping Factor At 100hz 8Ω = 1300
• RCA Single ended Input impedance 20kΩ
• Differential Input Impedance = 40kΩ
• Single Ended Input Gain = 30.6dB
• Differential Input Gain = 33.8dB
• SNR -110dB
• THD-N = 0.005% @ 100 watts 8 Ohms
• Recommended Linear Voltage Supply +-92 volts DC
• PSU Power Transformer secondary windings 65vac (2KVA)
• Printed Circuit Board Dimensions 360mm x 63mm
• Recommended Conrad Heat Sink 2 x MF35-150
• Designed as high performance High End 2 Channel stereo amplifier
• Unconditionally Stable into any load from 2 ohm loads and up
• Extra Heavy Duty Two ounce copper printed circuit board
• Rugged Dual Die Lateral MOSFET Output Stage

Basic list of parts needed to build a 1 x  Mono Block NXL1000 R1 Amplifier.

• 1 x HPA-NXL1000 R1 Amplifier Module
• 1 x HPA-PSU Two R3 Power Supply Board
  
• 1 x HPA-MCU Power One R1 AC Mains Controller
• 1 x HPA-SS/Relay One
• 1 x 2500VA toroidal power transformer with 2 x 65VAC secondary windings
• 1 x Conrad 2 x MF35-150 heat sink minimum