No real breakthroughs or advancements apart from capacitors with lower harmonics and slightly faster settling woofers. Some manufacturers finally decided the shape of the cabinet was important enough to dictate design and that was known in the 1950s.
The new diamond tweeters have low harmonics but slow rise and settling time. JM Labs Beryllium now have higher frequency extension but no other improvements or differences over previous Yamaha beryllium designs of the 1970s, as the measurements reflect in addition to listening.
The new diamond tweeters have low harmonics but slow rise and settling time. JM Labs Beryllium now have higher frequency extension but no other improvements or differences over previous Yamaha beryllium designs of the 1970s, as the measurements reflect in addition to listening.