At the risk of repeating myself, how does one tune a back, (or a front), duplex? What is the procedure should one of want to try it? -- Geoff Sykes -- Los Angeles -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Richard Brekne Sent: Sunday, August 19, 2007 7:37 PM To: pianotech at ptg.org Subject: Problems With Duplex Scaling Of Pearl River Grands? I'm not sure I agree Terry. In your last post to Andrew you state "When we "detune" a front or backscale, don't we specifically try to avoid a fractional length of that note's speaking length to quiet the front and/or backscales?" which implies it DOES make a "whit" if the back duplex is tuned to a specific relationship to the speaking length. Once accepted that certain relationships to the speaking result cause clear and predictable acoustic results... you are immediately into a judgement call as to whether the results are desirable or not. Strikes me that manufacturers are all out to make things as cost effective as possible... if the whole basic back duplex idea was totally ridiculous to begin with... no amount of marketing can account for the fact that so many manufacturers are wasting so much time, money and resources putting them in. Another thing... when I stop to think about it.... I dont see any data supporting the idea that the basic Steinway back scale idea doesnt work. I just hear a lot of claims. Today I used a bit of ekstra time tuning the top 6 notes on a C I service. I tuned the back lengths to exactly the same frequency as the speaking lengths.... I got a very clear and definite improvement in sound. Much cleaner, increased sustain and volume. At least thats what my ears told me, and it seemed pretty darned obvious. Cheers RicB Indeed. Terry Farrell ----- Original Message ----- >> /"On any given string, the duplex segment will not match the pitch of the >> speaking segment of the sting. (It cannot because these two segments are >> different lengths)."/ >> Since when? I mean, assuming the duplex segment was somewhere close to >> being "tuned". >> Terry Farrell > > > If any rear duplex segment lengths match their speaking lengths, it's only > going to be in the top octave. Lower down, the speaking segments get too > long. And for that matter, why should it matter a whit if the rear duplex > is any direct relationship to it's speaking length? It'll be just as > "tuned" if it's pitch matches something somewhere up or down scale. > Ron N > * Previous message: Problems With Duplex Scaling Of Pearl River Grands?
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