Did you sell your A1 & X1? OP, you need the X1 because it provides the necessary EQ for the NHT subwoofers. The natural -3dB point of the subs is 58Hz but the X1 drops the -3 dB point down to 26Hz. I guess if you had to, you might be able to get by by manually EQing the subs and use an electronic crossover. Stereophile reports that the X1 adds 12dB at 32Hz.
Are there alternatives to an NHT X1?
We inherited a set of NHT speakers. We have one A1 amp, but no X-1 crossover. I cannot find an X-1 for sale online. Based on the diagrams, we need an X1 and another A-1 to power the subwoofers properly. Is there a workaround? FYI - we are novices so please forgive any basic questions:)