The Duplex affect

[Ron Nossaman]

> */Hi Dave/*
> */  I agree about the rear duplex. It's the front one we need to do away 
> with mainly by increasing draft angels & keeping the energy in the 
> vibrating speaking length where it can offer the most tonal/musical 
> impact./*
> */  Yes... it makes you a control freak....and so?  That's what we get 
> paid the big bucks for./*
> */  Dale/*
> 
>     Dave P. wrote
> 
>   I’m with you on the duplex scale thing.  */_The rear duplex probably 
> adds some high frequency sounds more of a cymbalstern effect since all 
> the frequencies are singing along with the vibration of the bridge.  
> That’s fine unless it gets obnoxious_/*.

As long as it's not muted, and has some realistic length to 
it, the rear duplex will make noise somewhere in sympathy with 
what's being played whether it's tuned or not. When the front 
makes noise, it's typically obnoxious. Making the duplex 
segments short keeps them quiet. They still have to flex as 
the string vibrates and the string rocks across the V bar, so 
muting them kills tone even when they aren't themselves making 
audibly detectable noise. Grind those tuned suckers off, and 
put a half round brass counter bearing as close to the V as 
you can get to keep the segment short, and all sorts of 
problems go away.
Ron N