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Nothing wrong with 2 subs. The overall sound will be the same, bit with a little less effort. If you take the time to properly eq them both in you could get a smoother and better overall integration with your speakers.
No problems with two Gemini Mk2's, get really good bass and havent had any probs integrating them.
Have a google about it, Ive also posted some links in threads where the question was asked, there's actually a lot of positives that can come from using two identical subs, and quite widely recommended.