Like Irv mentioned, it's a PITA to sell and ship any big speakers if you don't like them after buying them purely based on reviews.
I've had to sell my Salon2, B&W 802D2, Phil3, DefTech BP7000SC, BP7001SC, & SuperCube Trinity Sub, and many others.
PITA.
All these speakers, including Legacy, are great speakers. But there are MANY great speakers that can play 20Hz.
I also caution reading the specs on bass responses. So many times a company will advertise 18 Hz or even less, but the reality is often untrue or at least misleading.
Unless you just love and must have the aesthetics of those Legacy speakers, for $10K or even $5K, I recommend you audition the speakers for YOURSELF.
And I would learn how to read graphs first before spending $10K on speakers.