![]() ![]() Now, while these units can help, a lot of the problem is that a piezo really isn't the wonder pickup its touted as. Now, feed the device pink noise, and compare the output spectrum of the noise (should be a straight line at the output level on a logarithmic frequency chart) with the input spectrum of the unit to see how the unit colors the input signal with the controls in any configuration you like. ![]() Set up the DI in a "loopback" configuration, where the output of the interface feeds the input of the DI and the output of the DI feeds back to the interface. The exact native EQ curves of these are proprietary, but you can explore what the units do with an external soundcard and some frequency-analysis software (available free in a variety of flavors, personally I'd try Room EQ Wizard, built to assist in "ringing out" performance and recording spaces). That's a combination of the preamp's and transformer's natural "coloration" of the piezo tone, and your ability to dial in more or less of that color by tweaking the EQ. The preamp solution is 100% about using EQ to smooth out the harsh plastic tone. The Fishman Aura Spectrum is an example of the second and much more extreme solution, digital modelling, specifically "acoustic impulse response" modelling. The unit is basically a combination of a preamplifier stage like you'd find on a combo amp, running through a DI transformer to produce the balanced lo-Z output. ![]() Baggs Para Acoustic DI is a good example of the first one, straight up tone shaping. Piezo processors come in two primary flavors. ![]()
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