The @ sign with a member name right after notifies them (see how its highlighted now?).....so old "20Hz" has now been summoned by you
A space between the @ and the 20hz would avoid that.
What particular rating is that at 20hz, tho? Is it an in-room f10, f6 or f3 ? Have you ever measured response? OTOH if you don't look to deep bass they could work fine I suppose (it's been quite a while since I heard a pair, tho). I'd still rather have deeper bass via subs but YMMV.