New vs. old technology in speaker design should not be a factor in buying a speaker.
Most of the new speaker technology has to do with using newer materials and techniques to make cheaper speakers sound as good as "old speaker" technology, which is usually built better but more expensive to produce. Of course, there are exceptions to this, but you will always have audiophiles who will swear that a paper driver is better sounding than one made with new tech aluminum or kevlar. In the case of dynamic cone speakers (which all of speakers you mentioned have), there hasn't been any major breakthroughs for the last 50 years or so. The breakthrough will come in a different application and will be expensive or dangerous like plasma tweeters.
I hate to use analogies, but why can't modern violin makers using new tech build a violin that sounds better than an old Stradeverious? Mostly, because it is not the materials but it is the art and execution that counts (as TWL pointed out).
Most of the new speaker technology has to do with using newer materials and techniques to make cheaper speakers sound as good as "old speaker" technology, which is usually built better but more expensive to produce. Of course, there are exceptions to this, but you will always have audiophiles who will swear that a paper driver is better sounding than one made with new tech aluminum or kevlar. In the case of dynamic cone speakers (which all of speakers you mentioned have), there hasn't been any major breakthroughs for the last 50 years or so. The breakthrough will come in a different application and will be expensive or dangerous like plasma tweeters.
I hate to use analogies, but why can't modern violin makers using new tech build a violin that sounds better than an old Stradeverious? Mostly, because it is not the materials but it is the art and execution that counts (as TWL pointed out).