4 or 8 ohm connection for a 6 ohm speaker?


I have a pair of Thiel CS2’s that have a nominal impedance of 6 ohms. My mono blocks have output impedance connections for 4, 8 or 16 ohm speakers. Is it best to connect the speakers to the 4 ohm or 8 ohm connections? 
Thanks for your thoughts.

Bill from Nova Scotia
wgs57
Tomic601, that makes sense to me as well...thank you. So glad I made the change to the 4 ohm taps today on everyone's recommendation because all around I now have a very pleasing sound output with a boost in the bass and a less hot high end. 

Next change will be the input stage on both mono blocks. 

Bill from Nova Scotia
Love Novia Scotia!! Haven't been there for years
I have my Maggie's on the 4 ohm tap of my tube amp, and to me they sound great. Nominally there are a 4 ohm speaker though

Hi jrwaudio! Well anytime you can get back to Nova Scotia it is even more beautiful...

The gentleman I purchased the two tube mono blocks from told me to always keep a speaker load on it when turned on so I was worried about trying a 6 ohm load on a 4 ohm tap initially but it all worked out in the end...4 ohm taps it is! Just being over cautious lol.