Then tell that to the companies who have it listed as 4 gauge in the amps specs.
* Type: Mono Block
* 1-Ohm Power Rating 1x2000
* 2-Ohm Power Rating 1x1300
* 4-Ohm Power Rating 1x650
* 1-Channel Mono-Block Operation
* Super D-Class Amplifier Topography
* Ultra-Fi MOSFET Outputs
* Illuminated Hifonics Logo
* PWM MOSFET EXVP (Exponential Vari-Power Supply)
* SPC-Twin Turbo-Torroids with Simpatico Coil Design
* Fully Adjustable Accu Cross Crossovers include:
* - 24 dB Subsonic Filter (Adjusts 15 Hz to 35 Hz)
* Phase Shift Adjustments, (0 to +180-Degrees)
* 24 dB Low-Pass Crossover (Adjusts 35 Hz to 250 Hz)
* Bass Boost: Variable Bass Equalization (+ 10dB @ 45 Hz)
* Remote Bass Control Included
* Balanced Line INputs w Optional Hifonics MM-BLD1
* Gold RCA Line Outputs:
* Permit Amplifier Daisy-Chaining
* (0.2v to 9-volts Signal Level)
* 4-Guage Power Connectors
* Dimensions: 14.97" x 2.52" x 9.45"
http://www.ikesound.com/HiFonics_BXi2010D