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.

Two of the NXL1000 R1 amplifier modules can be used in BTL mode for over 3kW into 4 ohms!

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