connection of dual 2 ohm voice coil subs

Actually, the original (as in first and second generation) HCCAs were 1/2 ohm stable, and in the case of the 225, I PERSONALLY ran one bridged into 1/2 ohm, for .25 ohm per channel. By the time you get to loads like that, though, you'd be well advised to have an ET replace your amplifier's stock OEM power and ground with at least a #8, and you'll be needing forced cooling.Four 2 ohm voice coils will allow you a .5 ohm, 2 ohm, or 8 ohm load for the amplifier to be bridged to. The series/parallel option posted above will be your best bet, I'm thinking. That will give you a one ohm load per channel, perfectly safe for that particular amp, any generation...It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."