Speakers - down to 40hz at best Subwoofers - down to 15hz at best Transducer - down to 5hz (claimied) Maybe the answer isn't multiple subs or massive units like the B-DEAP32, contrabass, B4+ and Everest. Perhaps we should all be running our subs from 80-20hz and then using a Buttkicker from 20-5hz. You can't really hear a pure 20hz tone, it just makes the floor wobble instead. So who cares if a woofer does it or a mechanical piston? Makes me wonder if I should buy a 2nd SVS or a buttkicker. What do I want to achieve?