I'm curious - 'anyone know the difference between the 2418H and 2418H-1? They definitely have their own specific diaphragms. I'm wondering if the -1 series is the ruggedized version, (like the 2404H-1), resulting in slightly less HF extension, (like the 2404H-1). I've got the plain 2418H series in my little MR922's, but haven't done any objective testing, and 'nothing comparable here to compare them with...
John