If you want to cut off your main speakers at 80 Hz you will have to have either an active crossover or a passive attenuater between the amp and pre. The option is to run the main speakers full range and run a parallel set of signal leads to an active or passive crossover driving the sub amps. I use REL subs, which give many options and I recommend. There are other powered subs which do similar things. I think any of them would work well with a typical tube preamp. With an external crossover it would depend on WHICH crossover and WHICH preamp but most should work well, consult the makers of the units under consideration for best advice.
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