I have my 770 front channels to Axiom M80ti's, center channel to Polk CSW404 and surrounds to Polk RTi38's. I therefore have 2 spare channels. I am rebuilding my subwoofer and changing my enclosure from a 54L sealed adire alignment box to an 85L vented sonotube tuned to 20Hz. I'm using an Audiosource Three amp in mono at 400 watts into the Shiva 12 inch driver for the sub. I will be moving this driver into the new vented enclosure.

Do you think I would be overtaxing the two 770 channels if I ran them each into one of the two 8 ohm voice coils of the Shiva driver? I currently am running the bridged Audiosource into a the two 8 ohm voice coils running parallel as a 4 ohm load.

Thanks,

Ian