Can you please elaborate on the differences / benefits of the Apurna versus the Heisenberg?
Hi
I could not compare Heisenberg to Apurna™ Soprano the same day, on the same system. I will not say more about Heisenberg as I was Audionet dealer for 2 years and I had a good relationship with Stefan.
That said when I had Apurna™ here, these change the rules so much that I could not believe how better are this French brand I do not know Apurna™ until 1 speakers manufacturer told me that it is the best amplifier he had ever listened to, and other customers in Europe I know for their very good knowledge about music and audio.
APURNA™ monoblocs are available in 2 models: Soprano and Apogée. Soprano is the first level of output power at 450W into 4ohm then Apogée is 600w into 4 ohm. more power into 2 ohm.
Full specs here
www.phpaudio.fr
My monoblocs are Soprano limited Apogée, same power than Soprano but all the technologic subtleties of Apogée.
The sound difference of APURNA™ to all contender I tried, is that the sound is more natural, the question of SS and tube is irrelevant. They have no trade of the coldness that is the signature of other amplifiers. The second point is that the APURNA seems twice as powerful sonically than its real value. On pop music, contemporary music even experimental, you could have a realistic uncompressed sound like in a hall (even with the Apurna™ Prélude stereo amp). Then you will hear much more details especially if you have APURNA™ monoblocs with their monoral preamp. No cable inside, no cable link, transparency is in an other world. The last major virtue is soundstage and hall ambiance. Wide, deep and you fell the hall air, amazing. When I received here the world class maestro Teodor Currentzis, he was amazed how realistic was his recordings (the French sound engineer Max Ciup Grammy Award nominee was here too ).
All other performance, frequency extension, bass, tightness is at the top, may be better than all from mid bass to sub bass. Voices are palpable like on a small single ended amp.
Franck Borne the designer advised that he uses disruptive technology from aerospace and military field (he still work sometime for this). I can only say that these amplifiers are without peer (this answer your question), and each time I demonstrate Apurna™, each time the melamine order the French amp.
Last word : Apogée is limitless and is the very best I know, cost no object. It could have an infinity of finish. That's why I asked Franck to make Soprano Limited Apogée that have the same sound than Apogée (with less dynamic capability) at a more affordable price. About dynamic scale and impact like in real life, you will discover that amplifier could close the gap with unamplified music.
Apurna™ was lauded in 2017, was at Munich show in 2028 and 2019 and make no advertisement. Production is quite small with 10 to 12 units per year, and could be 25 at most. They are made like Swiss watches by Franck himself.