a blind test can certainly be done for a lengthy listening session -- you are thinking of the A/B/X type of blind test
Xyzal (levocetirizine) is an antihistamine with the usual side effects; IIRC it is an enantiomer and can be protected under IP laws, while "zyrtec" cannot - it may or may not be any better (so still use a $500 Miele to vac your speaker cloth)
Xyzal (levocetirizine) is an antihistamine with the usual side effects; IIRC it is an enantiomer and can be protected under IP laws, while "zyrtec" cannot - it may or may not be any better (so still use a $500 Miele to vac your speaker cloth)