The problem is, speaker designers tried to go as close as possible to live music sound before mid 60x. After that they started to create virtual sound that should impress audiophiles and push them to by their product.
There are a number of factor that started influenced from mid 60x:
1. Rock music popularity. Since The Beatles, rock music sound is 100% artificial, full of effects and sound transformations created by balance engineers and producers.
2. Transistor amplifiers become popular and affordable. This leaded to popularity of small low sensitivity speakers with nasty dynamic compression.
Last 4 decades POP electronic music became more and more popular. 20 years ago majority of audiophiles listened mostly jazz and classical music. Today a big part of audiophiles listen POP music (sadly they could’t understand that this music recorded for boom-boxes).
As results speaker producers have to adjust to the market.
There are typical characteristic of modern main stream Hi-End speakers:
1. Not natural tone. Producers don’t care about it at all!
2. Low sensitivity with nasty dynamic compression. Small boxes and small and heavy-cone bass drivers.
3. Emphasized high frequencies. Scratchy sounding tweeters made from modern ultra hard and light material . This kind of sound doesn’t exist in live music.
4. Ultra deep bass with a lot of compression and bad definition. Bass slam that doesn’t exist in live music.
5. Flat, boring, synthetic mid-range without real resolution, miro-dynamics and dynamic. No good mid-range - no music.
Yes. There are a lot of speakers producers today and there are a few exceptions from this rules. But most of companies (are pushed by marketing, audio dealers and reviewers) confess this modern Hi-End mainstream sound.
I changed 4 pair of speakers from 1998 to 2001. The last speakers were Spendor 2/3 - a really musical speakers great for classical music. But in 2005 I bought a vintage pair of Altec 604E made in 60x. Since that time I haven’t changed my speakers.
Maybe I’m not I typical audiophile. But it is fact of my audiophile experience.