I had my zv4 on a sq2200 and its was OK but now that it is on a 3500 boy it really shines.... doesn't get stinky at all for me and it actually moves now like it should be. I'm wired at 1ohm so I know I'm safe. If I had the d2 version to wire it at .5 then I would be a little worried. Its probably seeing close to rated wired at 1ohm anyways after rise and all that.
whats your box specs if you dont mind me asking