I have tried the 20 and 27 mm I have to say the 20mm are tinny and the 27mm are as well just not as much so. I just put 2 27mm disks in my Gordy and wow what a smooth rich sound. they are wired parallel and on each side of the bridge less than two inches apart. That made a difference big time over a single.
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Yes, size matters. Enough said
I have tried the 20 and 27 mm I have to say the 20mm are tinny and the 27mm are as well just not as much so. I just put 2 27mm disks in my Gordy and wow what a smooth rich sound. they are wired parallel and on each side of the bridge less than two inches apart. That made a difference big time over a single.