If I had to just pick one without listening to it on a trombone first, I'd probably pick the SM57. The SPB1 might sound fine on a trombone, but I wouldn't want to predict that without trying it.Originally Posted by slidemasterx
Have you considered just using a stereo pair to mic the entire trio? That's probably the best way to record a trio like that - even if you wind up using some close mics to enhance it, the stereo pair would provide the bulk of the sound. But only if they are performing in a good sounding room.