For small chamber, often, not always, I prefer listening to great performances on a good system rather than live performances. The simpler the music gets, the lesser the divergence between a good system and live, so a great performance recorded can more easily be preferred to a mediocare one live. And even simple well set up systems, not necessarily expensive ones, will be able to achieve this.
Having just heard Isabel Faust and Melnikov perform various Beethoven sonatas in good acoustics at Wigmore hall over two days, I would prefer to listen to Heiftez (kreutzer) Oistrakh/Oborin, and Szeryng/Rubinstein. Some of these sound great even if you play off good channels on youtube like Cgoroo to a soundbar. You also get a choice to hear some rare ones from Max Rostal, Ede Zathureczky, Di Vito, and George Enseco (his Beethiven Sonata LPs can cost well over a 1000 have even sold for 4k+) if you have a collection like the General's, but the point is you can pick and choose excellent performances that sound great acoustically and stun you emotionally.
I would suggest on a lower cost trial, get crossover from Werner Jargusch in Germany. with one iteration they should work well and will barely cost you a 1000. Else pay Misho to visit you and fix it. the Hiraga solution is not going to work.
I appreciate your opinion that "simple well set up systems", "not necessarily expensive ones", playing "excellent performances" will "sound great acoustically" and "stun (me) emotionally". I also would like to thank you for the references to classical music you feel are "excellent performances", I will certainly look out for those recordings.
I also recognise that you
did not say that "simple well set up systems", "playing excellent performances", would sound indistinguishable from live so there we are in agreement.
As to obtaining "Natural Sound" (or better sound) you suggest I contact Werner Jargusch in Germany for a different crossover than the Hiraga style crossover that Pete Riggle is building for my Altec A7s.
Let me show my reasons for choosing Hiraga style crossovers from Pete Riggle: from a write up in Positive Feedback (Jeffs Place):
"I was absolutely blown away by Pete Riggle's A7 VOTTs last week. Pete built a variation of the Hiraga crossover that he adapted to the A7's, and he used iron core inductors, so you may be on to something there. Pete's A7 system is on of the best hi-fi systems I've ever heard. It was love at first listen for me." "Pete also has some capacitors that he's discovered that are really something special, and that is part of his secret for good sound too, I think. It doesn't hurt that Pete has six decades of experience modifying and designing loudspeakers, and once owned a loudspeaker company." "His A7's are rich, warm, musical, and utterly captivating to listen to music with. If I can get my A5's sounding that good I'll be in heaven!"
Then there is a glowing review of the system owned by the designer of the Hiraga crossover (Mr. Jean Hiraga) in Do It Yourself Audio, by the Moderator, "Pano".
"These are my favourite speakers of all time. Never heard any other speaker of any size, shape, technology or vintage that sounds more like real live music than these."
Gary Fisher wrote about his restoration of a pair of A5's (for which he originally used Werner Jagusch's auto former based crossovers, saying he:
"found them (using Werner Jagusch crossovers) to sound pretty nice with the high-frequency volume set on the sixth terminal screw from the left, with the roll-off starting frequency dial set at the 9 o'clock position. Those settings gave a rich, dark, sweet presentation to the A5 VOTTs which was nicely musical."
However, Gary only experimented with the Jagush crossovers until his Hiraga crossovers arrived. He did not stick with the Werner Jagusch's auto former based crossovers but instead used instead the "'Real Sound' version of the Hiraga-style A5 crossover circuit from Yazakisan." , changing slightly the design by replacing the 20 Ohm variable resister at the R3 position with a 30 Ohm wire wound variable resistor in order to obtain a more seamless high frequency integration (as learned through experimenting with the Jagusch crossover).
By the way, I tried to contact Werner Jagusch a couple of times after you suggested buying his wooden tractrix horns for the treble, but he never responded to those enquiries.
Yours is not the only suggestion for obtaining "Natural Sound" from my system. Two others on this site have advised that in order to get "Natural Sound" that I need to change back from the dedicated circuit, Furutech power sockets and plugs and ZenWave power cords I bought, to the stock power cords and sockets.
I think I need to point out that in hi-fi, as in all things I suspect, there is an agonising paradox of ambiguity. Everyone has preferences, and reasons for those preferences, but like the story on another thread I read about a reviewer comparing two amplifiers who thought it perfectly legitimate to move his review speakers between each audition in order to present each amplifier in its' best light, what convinces some of fact will not convince others, and I now know I can not trust anything suggested to me by experts any more.