I listened to them with the same amplification and cables, etc. I also had the opportunity to listen to some in different systems, but not critically; it was mostly at the dealers who then let me borrow the devices for home audition, except for the Wadax, and the Ideon, and the big Lampi (not the Horizon) that I also listened to in a private system.
As you mentioned, the effect can very well be due to amplification or cabling, etc. My amplification is Symphonic Line Kraft. I (obviously) like the sound, it is punchy, powerful and dynamic and does not run out of steam, but it does not offer the resolution of, say, an equivalent CH Precision.
I listened to a lot of music, blues, classical and jaz, but primarily compared using Jochum's Carmina Burana, (Klemperer's Messiah, and) Tchaikovsky, Liturgy of St John Chrysostome
Please note that is a personal and subjective impression, not a review, test, or otherwise objective assessment or wall-to-wall criticism of the excellent DACs available out there (nor do I sell such products).
Regards