There are some technical factors that should be taken into consideration in making this choice:
1)The Bryston has very low input impedances of 6.5K unbalanced/4.5K balanced. Those values are low enough to be a problem for most tube-based source components, and some solid state source components. Even if those values aren’t a problem for the source components you presently have, they may significantly constrain future upgrade possibilities.
2)According to Stereophile’s measurements the Ayre provides essentially zero gain from any of its inputs to its balanced outputs (which are the outputs that would presumably be best to use with your fully balanced amp). Since the efficiency of your speakers is somewhat low (specified as 85 db/1W/1m, with the identically specified earlier version of the speaker measured as only 81 db at http://www.avmentor.net/reviews/2014/atc_scm40_2.shtml), that lack of gain may be an issue if you are using vinyl or other analog sources. With some analog sources you could conceivably even find yourself wanting to turn the volume control up higher than it can go, especially if you listen to material having wide dynamic range such as a lot of classical symphonic music.
3)The balanced inputs of your amp have an **extremely** low input impedance of 1.88K. I suspect that the Pass and Ayre preamps would be able to drive such a low impedance with good results, but it would probably be a good idea to check with the manufacturers to be sure.
Good luck. Regards,
-- Al
1)The Bryston has very low input impedances of 6.5K unbalanced/4.5K balanced. Those values are low enough to be a problem for most tube-based source components, and some solid state source components. Even if those values aren’t a problem for the source components you presently have, they may significantly constrain future upgrade possibilities.
2)According to Stereophile’s measurements the Ayre provides essentially zero gain from any of its inputs to its balanced outputs (which are the outputs that would presumably be best to use with your fully balanced amp). Since the efficiency of your speakers is somewhat low (specified as 85 db/1W/1m, with the identically specified earlier version of the speaker measured as only 81 db at http://www.avmentor.net/reviews/2014/atc_scm40_2.shtml), that lack of gain may be an issue if you are using vinyl or other analog sources. With some analog sources you could conceivably even find yourself wanting to turn the volume control up higher than it can go, especially if you listen to material having wide dynamic range such as a lot of classical symphonic music.
3)The balanced inputs of your amp have an **extremely** low input impedance of 1.88K. I suspect that the Pass and Ayre preamps would be able to drive such a low impedance with good results, but it would probably be a good idea to check with the manufacturers to be sure.
Good luck. Regards,
-- Al