![]() You *may* like the sound of a passive piezo directly into the Axe, but it really isn't optimized for that. Hosa makes a typical adapter to convert from 50 k, the typical impedance of the magnetic pickup of an electric guitar, to 200 Ohms, the typical input impedance. ![]() I don't love the sound of my Baggs piezo pickups into ANY 1M device I've tried - they get fuller low end with more impedance, so I use acoustic preamps designed for that purpose. I did find a couple designs, however, that look to be the best Ive glanced at. Building a preamp to put within an acoustic is a pain sometimes. The upshot of this is that any piezo pickup without a preamp between it and the amp will sound weak and tinny. It sure would be nice if there was a small, quality tranformer for some of these piezo pickups most of us have littering our parts box. A preamp uses active electronics to deal with this impedance mismatch. I always use a preamp before hitting the Axe III input. Piezo transducers are high impedance devices, and this quality, along with the low impedance of the amp input conspire to attenuate the signal. I use the Axe III with acoustic guitar and mandolin, and it sounds TREMENDOUS. You will almost certainly find this pickups sounds very different when run into different preamps, even if they have the same quoted input Z spec. my advice: passive piezo pickups are extremely sensitive, and small changes to cable length, type, and input impedance often have a dramatic effect. A lower input impedance results in a lower bass output, which is an opposite effect of a guitar pickup. This is a super high-impedance, Peltier Piezo pickup. A pickup system installed on an acoustic guitar, for instance, can include one or more pickup devices (magnetic, piezo, or microphone) that allow the instrument to be connected to a direct box and then to the PA system. Without a preamp, the signal from a piezo pickup would be too weak to be heard over a guitar amplifier. ![]() I've used a bunch of these piezo pickups into various devices. A piezo pickup needs a preamp in order to boost the signal it produces. Also note the devices recommended in the Baggs manual have an input impedance of 10M.
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