I had the same problem and I have two ways to solve your problem. I have a stereo/mono amp that I use with a crossover on my sub and sounds nice. Most crossovers have a volume control on them, as mine does. I also have an extra Sony 55ES stereo 100 watts and 200 watts mono amp that has a volume control on the amp. You won't need a pre if you go with an amp like the Sony that has a built in volume control. Either way you go amp or crossover a class A/B amp will kill your class G NHT amp. I also had a NHT sub amp and found that both A/B amps sounded much better than the muddy sounding NHT amp. I hope this helps.
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