On my Eastman archtop with f-holes and an elevated fretboard, I mounted a passive twin head JJB piezo under the soundboard opposite where the bridge feet make contact. This goes to the ring of a TRS jack. I've used JJB in dozens of instruments from fiddles to mandolins, banjos, a resonator, flat top and archtops, multiple guitars, etc.
I also mounted a Kent Armstrong magnetic neck pickup at the end of the fretboard wired through volume and tone pots on the pickguard to the tip of the TRS output jack. A TRS cable connects to an LR Baggs Mixpro preamp, which lets me mix these two signals (all piezo, all mag or any combo in between).
The single mono cable out goes to my amp or the house system. I'm very happy with this setup, and none of it affected the unplugged acoustic sound. It was not very expensive either; $30 for the JJB, $70 for the mag pickup (Stew-Mac), $160 for the MixPro, maybe $100 for the pots, jack and cables.
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