The ZAHL H1 is the rare “palmable” amplifier that still plays in the summit tier, and to my ears it carries the same neutral, reference-first sonic character as the HM1. Its standout trait is the grip and control on demanding planar drivers — it’s breathtaking when the music calls for speed and authority. My main hesitation isn’t performance; it’s that the price lands in a very tough bracket.
Pros
+Summit-tier, neutral reference tuning (especially in Class A Servo)
+Exceptional driver grip and control on demanding planars
+Integrated PSU and compact, backpack-friendly form factor
+Multiple headphone outputs: 4-pin XLR, 6.3mm, and 4.4mm
+Stage control (widen/narrow/mono) and tactile hardware feel
Cons
-Very expensive (around 8k with tax)
-Can come across slightly “below spicy” around 6–8k on poor masters
-Texture/tactility is less emphasized than some more euphonic amps
-Not ideal for listeners who want very high-voltage headroom at extreme volumes on certain headphones