I bought all my few speakers pairs on many faith reviews before buying ... I could not listen to them...
it is no problem to buy good speakers this way today...
The real problem is what speakers to buy with no acoustic dedicated room or what speakers to buy with as goal a dedicated acoustic room...
And even before the acoustic question what are the room dimension and the speakers characteristic...
Buying without listenings is way less a problem than buying without paying any attention to any acoustic basics...
My fist speakers were the Tannoy concentric dual gold... Astoundingly good speakers... Believe it or not i NEVER listen to them in 45 years...Why? Because i learn acoustic AFTER selling them...I never hear them at their optimal level.... Alas!
Buying without listening them before was not the problem... Never listening to them in a good acoustically controlled room for them was the problem...