Downtown- You are actually talking about bi-amping. Unless the 2.9s have an active x-over, you will either need identical amps, or one with a gain control, or an active x-over. One choice would be to use a pair of DNA 0.5s, vertically bi-amped (one pair per side, one channel driving highs, one lows. You would need a pre with two pairs of outputs, or a pair of Y cables. Most of the NHT amps have a gain control, so that might be the way to go, provided it has enough current. The NHT speakers do like lots of juice.
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