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Honestly, I think two subs would automatically be flatter around the room, or, IOW, would have less highs from room gain and nulls from cancellations. I wanted my sub up front, so I had to rearrange the room to get the least "high and low" spots. Two subs, with differing locals in the room would create waves that interact differently in the room. Cancellations might still be an issue, but I don't think that would be an issue as long as they're phased the same.
I still somewhat prefer a sealed sub. Besides being smaller, they don't fall flat on their faces at the frequency that the port is tuned too (i.e. 18Hz). Anything below that frequency can send the sub into uncontrolled frenzies that *could* result in bottoming out or distortion. Sealed subs roll off gradually, whereas a ported/vented sub is flat to the tuned freq., but servo subs like the Velos greatly get around that. I do hate that my non servo sealed sub rolls off as quickly as it does though.
And I'd agree that two subs on separate channels is 500W x 2. Two subs, connected in series (e.g. two 8ohm subs make a 4ohm load) would be one 1000W channel.
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