I just had a Fishman Matrix Infinity installed on my D-28. It's an under-saddle pickup with the pre-amp built into the strap pin/jack. It has volume and tone rotary controls that fit inside the guitar, just next to the soundhole. Easy to adjust, but otherwise out of sight. It also has a bass trim slider switch. I'll be using it on-stage for the first time Friday night, but so far I really like it.
Bill, tgo