I use a Fishman under the saddle transducer in my Guild F 30. About 20 yuears old. (THe pick up, not the guitar) About the same size as a 00-28. If I play straight into a PA it quacks something terrible. If I use a pre amp like my Baggs Para DI it sounds very nice indeed. (This shouldn't be rocket surgery, use a pre-amp on ant transducer or they sound like hell) It sounds great acoustically when just a mic is in use. I have a Pick Up The World on my 'zook. Same story, use a good pre amp.

Don