Coincident speakers 14 Ohms - What amplification to use when streaming Tidal.

That was a Garrard turntable.  See what I mean? 

And now that I’m remembering, the amps were Macintosh 

The 14 ohms impedance isn't problematic for any amp.

It does not matter what source you use or what music you prefer. But you will need a bit of power since your music room is a bit bigger. So the SET idea is right out (and FWIW, most of the Coincident line is a bit on the low side efficiency-wise to really show off most SETs). The speakers are an ideal match with our M-60s, but they are outside of the stated budget. For that sort of money I'd be looking at something used with at least 60 watts.

You might consider line magnetic. There are a few models listed at usaudiomart that would be interesting to me if I were in your situation (I had super eclipse and now have pure reference extremes).

Decware might also be an option. I'd be biased towards tubes, although I did end up at first watt with my pre's. Loved coincident Frankensteins with the SEIIIs (move than a sit2).