You don't mention what it is specifically you're trying to accomplish here, especially since you're already using the Lyngdorf for room correction duties. That said, there are not many speakers on the market today at any price that wouldn't benefit at least somewhat from two good-quality subs using good integration software (not sure if your Lyngdorf can handle two subs?). I'd be surprised if you didn't hear a fairly meaningful positive difference -- and not only in the bass range -- if you follow that path. Then again, it won't be a cheap upgrade either. Best of luck.
