Yes, it certainly isn't as efficient as the Charney or the AN-Es. My 45 amp wasn't able to drive the Nenuphars. I ended up using a 32 watt PSET.
Cost and room-size are limitations for me with regards to large horn systems. I have, however, heard a few of these over the years and it was the sound, not the cost or size, that was the real deterrent. The only horn that I've heard that I could happily live with is the Odeon 28/3 (and, I assume, their higher models). Unfortunately, they are no more efficient than my AN-Es. In fact, less so.
Cost and room-size are limitations for me with regards to large horn systems. I have, however, heard a few of these over the years and it was the sound, not the cost or size, that was the real deterrent. The only horn that I've heard that I could happily live with is the Odeon 28/3 (and, I assume, their higher models). Unfortunately, they are no more efficient than my AN-Es. In fact, less so.