Refub could just mean b-stock, but also could mean product was returned since something was wrong with it.
I bought heavy discounted refub Dyson vac 4 years and it's still going strong as new, but YMMV.
As for HSU HB-1 bookshelves - I briefly heard them on AH 2012 GTG - I believe they are especially good for movies , but might not suit your liking for music, but great deal none-the less.
HSU offers same 30 days trial so - best guide is your own ears.
Just buy several and return the everything but the one pair you like the most. No risk, just your time and maybe cost of return shipping (not every vendor pays for it)