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Lorenz Vauck
Lorenz Vauck, Mastering Engineer
Category: Electronic Musical Instruments
Satisfied Customers: 1702
Experience:  Audio mastering engineer, experienced with recording, mixing, mastering, instruments and vst plugins. Just ask me:)
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My NP31 Piaggero has an occasional growl/rumble in its right

Customer Question

My NP31 Piaggero has an occasional growl/rumble in its right hand speaker. Can that be fixed, lose connection?
JA: How long have you had your NP31?
Customer: Two and a half years but the rumble has been there for more than a year.
JA: What have you tried so far?
Customer: Nothing yet. Only occasional.
JA: Anything else you want the Electronics Expert to know before I connect you?
Customer: No thanks.
Submitted: 7 months ago.
Category: Electronic Musical Instruments
Expert:  Lorenz Vauck replied 7 months ago.

Dear Client,

I am sorry to hear about that problem. My name is***** and I am a tech expert with 19 years of experience.

To me, this sounds like a damaged OP-amp, which cannot be really exchanged on your own. I would highly recommend contacting a local Yamaha dealer by going to

Please type in the box below, then click on the "Send" button to send me your reply.

Thanks for your patience and best regards,

Lorenz Vauck