![]() ![]() In electrical terms, they have very high output 'impedance', and most amps, which are set up for magnetic pickups, have a much lower input impedance. The problem is that, because they are such small capacitors the charge gets drained off very quickly by the usual sort of amplifier. Many undersaddle pickups (USTs) use very small piezo elements that are right under the strings as sensors: they tend to be electrically 'hot', and put out a fair amount of voltage. Anyway, if the surface area of the pickup is large and the force is concentrated in a small spot, the charge will be spread over the large area, and not much voltage is put out. All the piezos I've seen used in pickups are either ceramic, such as lead-ziconium-titanate-oxides, or Kynar a polyvinylflouride plastic that's been treated to make it piezoelectric. Thus a piezo pickup outputs a charge in response to a force.Įlectrically, they are small capacitors: a dielectric material between two conductive surfaces. Piezoelectric materials are sort of like sponges: when you squeeze them you push electrons out. The pre amp will come in handy with these but is not required. It uses 4 small piezo elements that attach to the underside of the guitar top directly under the bridge and they are the best piezo's I've heard. If you decide to do it- consider the K&K pick up system. Pre amps and EQs can give you lots more (or less) of what you've already got but they can't give you more of what's not there.Īs for piezos. To answer your question about using a 4 band EQ- If you like the sound of your guitar with a piezo installed then you will like it even more after the pre amp is installed. This style of mic is VERY VERY directional and picks up very little of the sound on the sides and is the best sounding little mic I've every owned. If I remember correctly the model number is DPA 4099. It is a very small super Hypercardoid condenser mic that comes with its own little plastic mic holder that fits right on the guitar and a thin gooseneck so the best position can be maintained by the mic (the sweet spot) easily. ![]()
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