I have owned the Tablette 50 Signatures. From what I gather from friends who have listened to both, the 50 Signature is said to be more composed and refined and a better speaker all round. It is definitely worthwhile to get the Signature version in the Proac line of speakers if there is an available option. The 50 Signatures are pretty rare to find in the market these days though. The equivalent would be the Reference 8 Signatures but some folks prefer the presentation of the older 50 Sigs more than the ones currently available in the market.
Similarly I was amazed at the imaging qualities and level of detail of the 50 Sigs when I had them. The highs were very airy and extended but after a while I found the presentation to be a little lean and thin for my taste. Since you listen to a lot of classical, jazz and female vocals, you might want to explore the Harbeth P3ESR. In my opinion this speaker excels in these types of music more than the Proacs. Of course, everybody hears things differently sometimes.
Cheers.
Similarly I was amazed at the imaging qualities and level of detail of the 50 Sigs when I had them. The highs were very airy and extended but after a while I found the presentation to be a little lean and thin for my taste. Since you listen to a lot of classical, jazz and female vocals, you might want to explore the Harbeth P3ESR. In my opinion this speaker excels in these types of music more than the Proacs. Of course, everybody hears things differently sometimes.
Cheers.