![]() ![]() ![]() In a simple sense, piezos physically lose a lot of the bass at the input connection because the physical connection between the high-impedance piezo and the low-impedance mixer input acts like a physical high-pass filter. This is true even of some very expensive violin bridge pickups. They are electrically considered capacitors and, for audio purposes, should have impedance in the range of many megaohms - while audio interfaces and DI boxes that you typically use have input impedance in the multi-kilo-ohms range. They put out a lot of voltage for a relatively small stress (example - the spark from a piezo-based cigarette lighter is pretty high voltage). Piezos, as you know, generate electricity from mechanical stress. That said, the main reason that piezo elements sound like shit most of the time is that most audio interfaces are not designed with piezos in mind. This is less of an issue when the element is fixed solidly to a surface to pick up sound. Many, if not most, piezo elements are of the type used in talking cards, where they are engineered to resonate more above 1kHz to make a clearly audible sound. They are in fact some of the most accurate sound capturing devices you can get. (Well-made) Piezo elements are extremely sensitive when attached to a surface. TLDR: The physical characteristics of typical piezoelectric elements and commonly used mixer inputs causes a natural high-pass filter that drops most of the lows below the kHz range, in the wired connection itself. ![]() Description in the edit at the bottom of this comment. I have built one myself and will try to upload clips when I am free, so keep an eye here over the next day or so. You need a DI with input impedance of 10 megaohms or so. Very few recording interfaces are designed to handle piezoelectric input. I know that I won't get an acoustic sound out of a pick-up but that's exactly my question: Why? What is it about the frequency response of pick-ups that makes them sound thin? Is it additional distortion? Or what's going on? Why can't I fix the sound with an EQ? It's like there is some sort of sound signature that's baked into the frequencies like some of esoteric vodoo magic that messes with the sound and that one cannot get rid of without magic.įinally something I can answer in depth!!! Answer: electrical impedance mismatch. There are some areas of the frequency spectrum that obviously stand out (like 1-3 kHz, usually) but taming them doesn't get me any closer to an acoustic sound. But when I dullen the sound it just gets, well, dull. I've always thought that if something sounded thin it had too much highs and too little lows. It always sounds thin, harsh and aggressive. Great isolation with no feedback but the sound is horrible and I can't do anything about it. CDR v12.0 file format, SVG v1.0 format, and PDF v6 format.Recently, I've been working more and more with string players that use pick-ups. Please find vector and raster files attached in Corel. Time spent actually laboring was about 9 relaxed hours with liberal self administration of beverages to stay hydrated. Most of that time was waiting for glue and shellac to dry between stages. In total, from start to finish, this project spanned 3 full days. If you want to make your box the easy way, try and look for the boxmaking app within his site. If the humidity is above 70% for you, allow additional time to dry or bring it to an air conditioned environment for the final drying stage. I will use PVA glue and clamp it every 4 inches around the perimeter and allow 12 hours to dry. I did not glue the bottom on mine because I intend to add more piezo elements to other locations inside the cavity. it will hum and possibly slap the inside of the cabinet during use, which can be annoying. by glueing in stages, you can adjust the box as you go along.ĭon't leave much slack on the piezo wire going to the audio jack. the joints shrink as the glue dries, causing warpage of the box dimensions. apply the glue in stages before proceeding to next glue joint. It will help with LASER residue wipe-down afterward.ĭon't try to glue it all at one time. Put a sealer coat of shellac on the wood right away, so it will have plenty of time to dry. The only electric or electronic components in this build are passive.ĭemonstration of the completed unit being tested is at Ĭompressor with pressure regulator and air drierīungee cords and wooden bar for makeshift clamp/hold-down This is not a solid state or tube type electric guitar effects pedal. It is sometimes played with a hard tipped drum stick or a rubber tipped mallet. ![]() This type of stomp box is a percussion instrument normally played by tapping a foot on the top surface but may be played by hand while held under the arm or on the lap. This instructable is intended to walk you through the building of an acoustic-electric stomp box. ![]()
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