coincident speakers are great, i have coincident victory 14 ohm 97db with cary 805C.
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If you use the 8 ohm taps with 14 ohm loudspeakers your going to make it that much easier for the amplifier to drive the speakers.
If effect what you are doing is increasing the impedance of the output transformer. This creates a better match between the high impedance stage of the output tube and your output transformer. Thus you should notice better dynamics and less strain.
This is because of the relationship between resistance,current, and voltage.
One of the biggest marketing gimics I hear is that you can't drive speaker "X"with tubes because they require high current. Tubes are voltages devices and therefore will not be able to provide enough power. If you look at the relationship between voltage and current you find one cannot exist without the other.
With the speakers you are considering you could connect a 2A3 amplifier to the 8ohm taps and have more than enough power.
Hope this helps
I think the BAT VK60 and Coincident speakers would be a very nice match. I recently purchased a pair of 14 ohm Coincident Total Eclipse speakers and was very pleased with the results when paired with a BAT VK75SE amp. When experimenting with the output taps, I tried both the middle and high, and actually preferred the middle taps. You really need to just listen and decide for yourself which one sounds best. The bass response was much improved with the 75SE amp driving the Totals vs my previous 4 ohm Dunlavy speakers. Not sure how much of an improvement you would hear, as I am not familiar with your speakers. But the overall sound is quite good - very smooth with lots of spunk.