Hi!
I am a FOH engineer, bought this mic because I wanted a ribbon mic for a guitar amp, but didn`t want to spend fortune. It turned out, I didnt`t have to. This mic is amazing. I understand that a "real" Royer would be much better, but for 66€ that I spent, it does a great job.
I use the mic on a guitar amp, it dilivers a smooth warm sound I was looking for. Used on a fender 5e3 tweed and Orange tiny terror, the crisp mids we wanted to cut out became soft and warm, lots of low end and smooth highs.
Definitely buying another one, to have a set for two guitar amps.
I also tried it on bass amp, great natural overdrive, but you have to be carefull, not to put it to close to the speaker...about 10cm from the grillcloth was ok.
Again, in my oppinion, great mic, especially for the price.