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inline attenuator of dual piezo pickups
inline attenuator of dual piezo pickups
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Old 10th March 2020, 11:06 PM   #31
Terry Demol is offline Terry Demol  Australia
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Originally Posted by chicofi View Post
I have a custom "stereo" cable that assuming I got the concept right, means I could have the resistor circuit hidden in the tailpiece of the bass (see attached)

Thanks! Yes it's a humbling instrument along with trumpet, trombone and likely several more instruments I'm not familiar with. But really, all instruments are difficult. some tell you up front and others let you know later as you're deeper in. It's also really hard to stand out as a guitarist - it's a deep instrument!
I've installed a few Piezo's in upright basses and it is certainly very tricky to
get an even natural sounding response.

There are a few options.

- The stereo jack OP with separate feed from each piezo is a good way to go
I don't think using a 1M passive potentiometer level control after each is the
best idea, depending on the OP level, the pot could introduce significant noise
purely due to the high value of resistance (Johnson noise) and the piezo
really wants to see a very high impedance for best sound. IME, an
active buffer fed directly from the piezo will give the best results.

- Another option is to make a dual active buffer + level control in a tiny box
with a single 9V battery. This can be mounted to the Bass with velcro etc.

FWIW, I've usually obtained best results using just 1 piezo and play with
the mounting location. How and where is your Piezo attached to the bass?
This makes a massive difference to the sound.

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