I owned the Extremas and heard the Guarneri on several occassions. Both speakers are excellent, with the Extrema speaking with a richer, fuller tone and the Guarneri a little brighter amd more transparent. The Extrema sounds "big", can play much louder, has explosive dynamics and great extension on the bottom. With the right amp it can produce quite some "punch", something that the Guarneri cannot do (Guarneri's bass is quite articulate but doesn't reach near as low). Both speakers have very refined and luxurious treble and they both image very well.
I can see Guarneri excel with small scale jazz and classical and the Extrema with rock and large scale orchestral music (although it can sound pretty refined with small scale music too).
The Guarner is easier to drive, whereas with the Extrema you'll need at least 200 watts of solid state or 100 watts of good tube amplification. Your Ayre amp is great, but it may not be enough.
I can see Guarneri excel with small scale jazz and classical and the Extrema with rock and large scale orchestral music (although it can sound pretty refined with small scale music too).
The Guarner is easier to drive, whereas with the Extrema you'll need at least 200 watts of solid state or 100 watts of good tube amplification. Your Ayre amp is great, but it may not be enough.