Piezo problem (uneven response)

[Manwithvan]

Can anyone offer some advice on this technical problem?

My Spectorcore 4 fretless has a much lower response from the A string. I've considered the string itself, break angle etc, but the fact is that simply tapping the A-string saddle gives a lower output than from the rest.

The volume difference is quite significant, so any ideas are gratefully received.

[ikay]

Sounds like a duff piezo element on the A saddle to me. The Spectorcore uses a Fishman Powerbridge. I think all the piezo elements feed into a circuit board on the underside of the bridge which combines the signal into a single output (coax cable). No adjustment for individual saddle outputs as far as I can see but that would be the first thing to check. Changing a single element would require connections on the board to be desoldered and resoldered which may be tricky. Back to a Spectorcore dealer or a tech for repair is probably the best bet. If you feel like tackling it yourself then try contacting Fishman to see if they can supply a new piezo element ([url="http://www.fishman.com/support/contactsupport.php"]http://www.fishman.com/support/contactsupport.php[/url]).

[luckydog]

Without knowing that specific arrangement, perhaps the transducer has slipped, or isn't tightly coupled anymore ?

LD

[steve-bbb]

maybe something like this?

http://www.east-uk.com/index.php/bass/piezo-magnetic-mixer/mpm-01.html