Two of the NHT subs would help even out the response if that is needed. But the two together will still only reach down to 37hz and the two together will still not match the overall output of the single SB1000.
If you don't need any output below 40hz (most music doesn't go much below this) and you don't need a ton of output overall and the price is right on a pair of the NHTs then it might be a nice option for a music setup in a small room.
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