I use the Hypex FA501 to power my DIY dual opposed subwoofer, it works fine and sounds verry good.
But it seems that the 500w from the Hypex is peak power, not rms.
The 500 watt peak output @4ohm looks not much compared to a SVS SB2000 subwoofer that has 500w rms and 1150w peak output.
In my old car i used a JL Audio class d amp that also had 500w rms @ 2 ohm with a test tone @50hz.
The Hypex looks well bould it seems strange that it has less power then other class D amps.
But it seems that the 500w from the Hypex is peak power, not rms.
The 500 watt peak output @4ohm looks not much compared to a SVS SB2000 subwoofer that has 500w rms and 1150w peak output.
In my old car i used a JL Audio class d amp that also had 500w rms @ 2 ohm with a test tone @50hz.
The Hypex looks well bould it seems strange that it has less power then other class D amps.