My Martin has was set up with a Full Circle but I always felt it had a somewhat choked sound. As I was getting the bass up to sell I took the pickup off and refitted the original bridge. But after a few weeks curiosity got the better of me and I fitted one of the Underwoods that I’ve got in my parts bin. I’ve always enjoyed that pickup, it gives a good lively sound with just the right amount of sustain and cuts through a loud band with aplomb. I had a gig with such a band last week and took the Martin to try out. But as soon as I turned the gain up it was as though there was a second bass playing behind me. It was the dreaded phasing issue. Now, I’ve been playing with an Underwood on and off for thirty years and I’ve been aware of discussions on this forum that advocate using one wing only. I’ve been sceptical about this because I’ve never had an out of phase with both wings. Until now. So I now get a great sound with the pickup in the E wing only. You could say after thirty years I’m a believer. Here’s a pic of a quick fix that has survived its first gig.