Which is the best matching speakers for PASS XA60?

Rabbani, are you asking about the XA60 or XA60.5? With the .5 I think you can use almost any speaker that is 88db or higher, with impedance profile being much less important than with the non .5 version. In the case of the non.5 version I think you need speakers that have more benign, smoother impedance curves and the higher nominal the better. I would not not think an RVC would be a great match with the low input impedance of the Pass amps, if you like the general sound of the Placette you might want to try the Placette Active. I used the Dodd Battery pre with the XA30.5 and that was a very good match due to the preamps low output impedance and like your Placette is also "off the grid".

Good advice Tom. Certainly the way to go IMHO. I do think the Pass will sound good with a very wide range of speakers, especially the .5 series. And if you need less power, the XA30 may be better yet. I would still go for tubes, but in the SS world Pass is tough to beat for my taste (Ayre should certainly be auditioned).