Re: Thumping sound when playing through amp
Normally an impedance mismatch would result in a lack of low frequency presence, rather than too much. You often have to roll off the low end really hard with these pickups - you actually don't need almost anything there under 196Hz with a mandolin. You need to cut those very low frequencies where the 'bumps' and 'thuds' are occurring.
The 'soft' sound part of the problem could be either incorrectly installed transducers, or impedance mismatch, or both.
Some more info would be useful.
What mandolin do you have? What does your friend have and which transducer is he using with it?
Which socket did you plug your mandolin into on the amp?
I would go and try your instrument into an acoustic amp that has a genuine, normal, true hi-z input suited to passive piezo transducers - such as a Fishman Loudbox. That will give you a much more accurate indication of where the issue really is here.
The Schertler's, while nice amps, are somewhat idiosyncratic and work best with their own range of fairly unique pickups, or with instruments have have active onboard electronics rather than passive piezo transducers.
Gibson F5 'Harvey' Fern, Gibson F5 'Derrington' Fern
Distressed Silverangel F 'Esmerelda' aka 'Maxx'
Northfield Big Mon #127
Ellis F5 Special #288
'39 & '45 D-18's, 1950 D-28.
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