I always loved md421 as well.Greetings from the North,
The Sennheiser MD421 is an outstanding bass mic. I've preferred using them in the studio and for live situations when ideal. In fact I not only used them when provided I went out and bought my own and recommend them to discerning bass players everywhere
Rezdog
Back in the days when I wa on Tour I always had a md421 from our technician.
I was an Ampeg PBass guy.
But in the last couple of years I recognised other good bass sounds.
I played some showes with an ac30 in it was beautiful.
So I thought there are more microphones beside the md421 which has a cool vibe.
Maybe there is nothing better for bass than md421.