Why do hollow bodies (e.g. Casino) Feed back?

[gvdv]

I've read the that feedback is a characteristic of hollow body electrics, and in conversation with a friend the other day was trying to work out why this would be.

 

If the hollow body is amplifying acoustically, and the pick up (an electromagnet) is responding electrically to the string being plucked, aren't these separate 'fields' of sound which wouldn't affect one another?

 

I would very much appreciate enlightenment about this.

 

Thanks,

 

GVDV.

[lpdeluxe]

That's not the issue: the problem is that both the strings and the top are being excited by the acoustic output of the amplifier. You pluck a note, the note is amplified, which causes resonant vibration in the top, which excites the string, which increases the signal going to the amp, and off you go. Solid bodies and semi-hollow bodies aren't as bad because the top isn't a resonation diaphragm.

[gvdv]

That's not the issue: the problem is that both the strings and the top are being excited by the acoustic output of the amplifier. You pluck a note' date=' the note is amplified, which causes resonant vibration in the top, which excites the string, which increases the signal going to the amp, and off you go. Solid bodies and semi-hollow bodies aren't as bad because the top isn't a resonation diaphragm.[/quote']

Hi lpdeluxe,

Many thanks for your reply.

 

Now I understand.

 

GVDV