The SB-4 is a good choice for a basic active DI for use with a passive piezo pickup like the K&K. The only thing you might do better with is something with good EQ to shape the sound, but if the PA you're going to has that and a good engineer to run it, you won't need it.
By the way, the PZ Deluxe is a nice preamp/DI, but it does not run on phantom power and in fact needs a dedicated 15v 400mA power supply.
Louis
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