Your terminology is correct. A dynamic mic does not require power, whereas a condenser mic does. The vast majority of mics that are used in this situation (internal guitar mic’ing) are condensers, because they are physically smaller, more sensitive, and in this situation have flatter frequency responses than comparable dynamic mics.
The mic in the Fishman you mentioned is a condenser as well - it is simply powered by batteries in the pickup rather than an external preamp.
The reason you’re not getting much response here is that dynamic mics aren’t really great for this purpose. They require a lot more gain than condensers, they are physically larger, and dynamic mics with diaphragms the size of a normal internal guitar mic really don’t sound very good.
Instead, you should look at swapping out the K&K Trinity mic with another condenser mic. There are plenty of mics that can be swapped out easily and can be powered by a huge range of external preamps without the artificial limitation that K&K built into the Trinity.
I know several guitarists who have installed a DPA 4060, or 6060 (which is the newer version) in place of the Trinity mic. That setup can sound absolutely fantastic.
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