What speaker could safely be ordered without hearing it first?

What’s your budget ?

MBL 101,   Marten Coltrane , Wilson watt Any of them ,

YG Acoustics , Magico , plus many more ,  your electronics, a front end , and cabling  all have a factor Synergy to all the above is important 

I owned a Audio store for a decade and nothing is a one size fits all 

if the front end electronics and cables are known then a speaker can 

be chosen to fit the buyers tastes.

Having owned a Audiostore I would ask ,what is your other equipment, room size 

and $$ budget  all 3 things count in building system synergy 

for example if you have a Sonus Faber which is a bit warmer, or Wilson 

 all tubes would be too much of a good thing in warmth.,

that’s just a example , and also what type of front end Thst too can be tubey warm sound if you had say a Lampizator.