Summary: The Sennheiser e906 is an affordable, supercardioid dynamic microphone tracing its ancestry back to the legendary, and now pricey, MD409. This compact, almost laughably shaped, microphone is deceptive--much like its forebearers and spin-offs there's a lot of sonic potential waiting to be unleashed. Feature-wise the e906 has a three position switch to affect presence, which can be boosted, cut or left neutral. The e906 handles transients and SPL without difficulty.
Summary: another really great mic for electric guitar cabs, just set it and forget it. most of the time I just sling it over the front of the cab like I would live. that's it. done. although not as sonically interesting as the heil pr40, this mic is a solid goto to guitar cabs and I almost always have one in the mix.
Summary: I bought this mic for the convenience of drapping it over the front of my amp and doing away w/the mic stand that can be kicked out of place and/or tripped over. Mission accomplished! I've used it twice so far and both times it seems to be picking up a lot of low frequencies from a sub woofer that sits 6 feet away and feeding back causing me to bring it down in the PA and turning up the amp which kinda defeats the purpose of putting a mic it in the first place.
Summary: I have 2 original MD409's as points of reference. As I have only used my new e906 for about 2 weeks, I can say it's a keeper. The e906 is not as full in the bottom end as my MD409's, and not as smooth, but it's certainly on par with any SM57 I've used. What I really like about it is the convenience of this mic. It's the easiest mic in the world to position, and it sounds consistently good enough that I can't blame a lame sound on the microphone.