Picked up an LSA HP2 from Underwood Hifi that I had been reading about. A biocellulose driver with graphene coating that is horn loaded. Made by Kennerton, it is mostly closed with a pinhole in the center of the flat wood cup. Spring steel headband with a leather strap and soft leather earpads. Kennerton's model is the Gjallahorn, is more expensive, may be better? I don't know. Using a Jot2 and HP1 from Neurochrome. Easy to drive at 33 ohm 105dB/mW efficiency. Very comfortable for long term wear. They go on and don't move around. The midrange is exceptional. Great separation and timbre. No bass or mid bass bleed. Details and plankton galore. Seriously hearing detail I haven't heard before, easy to distinguish different simultaneous decays, guitar cavities. There may be treble roll off, I can't say cause my ears are already rolled off. All I can say for sure is everything I can hear, I can hear better and there is quite a bit that I wasn't hearing before. Bass is clear, timbre is great , it goes down low and clear, bass nuances clearly audible, not a bass cannon but not needed either when it is so musical. Much more so than I am used to. Some sites describe this as a 40mm compression driver and I don't now how the horn loading is configured nor understand much about it. Front loaded? Rear loaded?. All I can picture is the RCA horn and I'm the dog. Occasionally, some vocals can resonate a bit and be less nice. I lower the volume a bit and don't lose a thing. Piano? A piano player would have to say if it is natural or not, it is certainly more detailed, solo or as accompaniment. The lower keys vibrate clearly and cleanly. The headphone may be the best I've heard that keeps instruments separated and well resolved. Will have to do a comparison but these may be reference to detect other's flaws. The headband was creaky in the beginning doing a little flex on it's own and microphonic if you tap on it. It has broken in and I don't tap on it. I'll chime back in with Verum, HD800s and Verite on their best amps at some point.