I couldn’t auditioned any of these as there aren’t available in Scotland, so I rely a lot on reading reviews and comparison.thank you! It matches my list except ferrum and luxman which I didn’t know.
Which one in your opinion are superior to Pass Labs HPA1?
As a sound signature I like neutral and dynamic, not warm laidback.
I think GSX/CFA3, HPA4, Ferrum, or Mass Kobo, Luxman p700, Audio Gd will all give a neutral sound. GSX/CFA and Ferrum being more dynamic if memories serves me right!