Just as the title says, i have a magnetic pickup and piezo pickup being blended by a preamp on the bass but the piezo is overpowering the preamp and causes some distortion. can i add something small onto the wire to lower the piezo volume? resistors or something? (electronics newbie here)
Enjoy the benefits of a premium membership!
Upgrade Account
-
TalkBass has been independent since 1998. Add your voice.
Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
Join free Log in
Want zero display ads or expanded classifieds tools? Compare plans.
Double Bass How do i lower a Piezo pup signal going into preamp?
- Thread starter JtheJazzMan
- Start date
It depends on the bass, but I know that you can adjust the piezo on MM basses by turning a small knob (or something like that) on the back of the bass (where you have all the covers for electronics and so on). Sure you don't have a volum knob for piezo volum?
Hope my English is understandable
Hope my English is understandable
I assume that the preamp is 'on board' - ie on the front of the main amp in the same unit. Then try something outboard, eg a Fishman Pro eq which is the Platinum Pro's little brother.
Its a biesele preamp, with his mag pickup in 1 input and a fishman full circle in the other.
when the blend is set to full piezo its a fair bit louder than when set to fully magnetic, and when you hit the e string hard, theres some distortion.
this happens regardless of where the volume knob is set, it just means the distortion is quieter, but still there. so im under the impression i need to lower the signal going into the unit
when the blend is set to full piezo its a fair bit louder than when set to fully magnetic, and when you hit the e string hard, theres some distortion.
this happens regardless of where the volume knob is set, it just means the distortion is quieter, but still there. so im under the impression i need to lower the signal going into the unit
Have you checked the 9 volt battery? If it's not the battery, I'd contact the manufacturer directly. The preamp should be able to deal with the signal from the Full Circle without distortion.
Just a note, even though I know this is a DB question. If a piezo pickup needs to be padded, I have formed the opinion that the correct way is with a capacitor in parallel with the pickup. Unless you know the capacitance of the pickup itself, choosing the best capacitor value is a matter of trial and error, starting with values around 0.001 to 0.01 microfarads.
big thanks to everyone, especially fdeck.
a 3.3 nF capacitor works a treat, really helps to match up the 2 pickup signals, and the distortion from the piezo is gone too
just put an RCA T-adapter into the fishman RCA and encased the capacitors in small RCA connector heads so ive got a bunch of easily transferrable capacitors between 1 - 10 nF
a 3.3 nF capacitor works a treat, really helps to match up the 2 pickup signals, and the distortion from the piezo is gone too
just put an RCA T-adapter into the fishman RCA and encased the capacitors in small RCA connector heads so ive got a bunch of easily transferrable capacitors between 1 - 10 nF
