<font color='navy' size='2' face='Comic Sans MS, sans-serif'>So <font size="2" color="navy" face="Comic Sans MS, sans-serif">I  want Goldilocks impedance? :)<br> <br> <div style="clear:both"><font size="1" color="royalblue"><b><font face="Georgia, Times New Roman, Times, Serif"><font color="black"><font color="mediumblue" face="Comic Sans MS, sans-serif">Dale Erwin... RPT</font><br> </font></font></b></font><font color="darkgreen"><span style="font-style: italic;"><b><font size="1"><font color="black"><font color="blueviolet"><font color="black"> <font color="black" face="Comic Sans MS, sans-serif">Mason & Hamlin</font><font face="Comic Sans MS, sans-serif">/Steinway/</font><font color="black" face="Comic Sans MS, sans-serif">U.S pianos</font><font face="Comic Sans MS, sans-serif"><br> </font></font></font></font><font color="black" face="Comic Sans MS, sans-serif">www.Erwinspiano.com</font><br> <font color="crimson" face="Comic Sans MS, sans-serif">209-577-8397</font><br> <font color="darkgreen"></font></font></b></span></font><tt><tt><font color="darkgreen"><br>  </font><br>   <font size="2"></font></tt></tt><br> <br> </div> <br> <br> <div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br> From: Delwin D Fandrich <del@fandrichpiano.com><br> To: pianotech <pianotech@ptg.org><br> Sent: Thu, May 24, 2012 3:02 pm<br> Subject: Re: [pianotech] David Love--Centeringthe bridge--was S&S something er other<br> <br> <div id="AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8"> <style>#AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8 td{color: black;} @font-face {font-family:Calibri; 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color:black;} #AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8 span.EmailStyle31 {mso-style-type:personal; font-family:"Comic Sans MS"; color:navy; font-weight:normal; font-style:normal; text-decoration:none none;} #AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8 span.EmailStyle32 {mso-style-type:personal; color:black;} #AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8 span.EmailStyle33 {mso-style-type:personal-reply; font-family:"Comic Sans MS"; color:navy; font-weight:normal; font-style:normal; text-decoration:none none;} #AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8 .MsoChpDefault {mso-style-type:export-only; font-size:10.0pt;} @page WordSection1 {size:612.0pt 792.0pt; margin:72.0pt 72.0pt 72.0pt 72.0pt;} #AOLMsgPart_1_144ee96f-1c4b-4418-933a-a0aa41369ce8 div.WordSection1 {page:WordSection1;} </style> <div class="WordSection1"> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:">You got it; not too high, not to low … just right.</span></div> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:">And the right balance between mass and stiffness. </span></div> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:">ddf</span></div> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div class="MsoNormal"><span style="font-size:10.0pt;font-family:">Delwin D Fandrich</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal"><span style="font-size:10.0pt;font-family:">Piano Design & Fabrication</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal"><span style="font-size:10.0pt;font-family:">6939 Foothill Court SW, </span><span style="font-size:10.0pt;font-family:">Olympia, Washington 98512 USA</span></div> <div class="MsoNormal"><span style="font-size:10.0pt;font-family:">Phone  360.515.0119 — Cell  360.388.6525</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal"><span style="font-size:10.0pt;font-family:"><a href="mailto:del@fandrichpiano.com"><span style="color:blue">del@fandrichpiano.com </span></a></span><span style="font-size:10.0pt;font-family:">— </span><span style="font-size:10.0pt;font-family:"><a href="mailto:ddfandrich@gmail.com"><span style="color:blue">ddfandrich@gmail.com</span></a></span><span style="font-size:11.0pt;font-family:"></span></div> </div> <div class="MsoNormal"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"> <div class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:10.0pt;font-family:">From:</span></b><span style="font-size:10.0pt;font-family:"> <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> [<a href="mailto:pianotech-bounces@ptg.org?">mailto:pianotech-bounces@ptg.org</a>] <b>On Behalf Of </b>Gene Nelson<br> <b>Sent:</b> Thursday, May 24, 2012 2:54 PM<br> <b>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br> <b>Subject:</b> Re: [pianotech] David Love--Centeringthe bridge--was S&S something er other</span></div> </div> </div> <div class="MsoNormal" style="margin-left:36.0pt"> </div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="color:black"> </span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="color:black"> </span></div> <div> <div class="MsoNormal" style="margin-left:36.0pt;text-align:center" align="center"><hr align="center" size="2" width="100%"></div> </div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:">The best we can do is to make that area of the soundboard scale as efficient as possible and keep the hammers as light as possible. Which, of course, means it is generally counter-productive to put heavier and harder hammers on a piano with a killer octave problem an attempt to increase “power.” </span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:">***An efficient soundboard scale would mean that impedance is not too low or too high?</span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:">Gene</span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:10.0pt;font-family:">Delwin D Fandrich</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:10.0pt;font-family:">Piano Design & Fabrication</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:10.0pt;font-family:">6939 Foothill Court SW, </span><span style="font-size:10.0pt;font-family:">Olympia, Washington 98512 USA</span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:10.0pt;font-family:">Phone  360.515.0119 — Cell  360.388.6525</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:10.0pt;font-family:"><a href="mailto:del@fandrichpiano.com">del@fandrichpiano.com </a>— <a href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</a></span><span style="font-size:11.0pt;font-family:"></span></div> </div> <div class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"> <div class="MsoNormal" style="margin-left:72.0pt"><b><span style="font-size:10.0pt;font-family:">From:</span></b><span style="font-size:10.0pt;font-family:"> <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> <a href="mailto:[mailto:pianotech-bounces@ptg.org]">[mailto:pianotech-bounces@ptg.org]</a> <b>On Behalf Of </b>Gene Nelson<br> <b>Sent:</b> Thursday, May 24, 2012 1:50 PM<br> <b>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br> <b>Subject:</b> Re: [pianotech] David Love--Centeringthe bridge--was S&S something er other</span></div> </div> </div> <div class="MsoNormal" style="margin-left:72.0pt"> </div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="color:black">Ok – hammer knock – the noise I hear if I mute the strings and listen to a hammer blow.</span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="color:black"> </span></div> <div> <div style="margin-left:36.0pt"> <div class="MsoNormal" style="margin-left:36.0pt;text-align:center" align="center"><hr align="center" size="2" width="100%"></div> </div> <div class="MsoNormal" style="margin-left:72.0pt"><b><span style="font-size:10.0pt;font-family:">From:</span></b><span style="font-size:10.0pt;font-family:"> <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> <a href="mailto:%5bmailto:pianotech-bounces@ptg.org%5d">[mailto:pianotech-bounces@ptg.org]</a> <b>On Behalf Of </b>Delwin D Fandrich<br> <b>Sent:</b> Thursday, May 24, 2012 1:39 PM<br> <b>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br> <b>Subject:</b> Re: [pianotech]David Love--Centeringthe bridge--was S&S something er other</span></div> </div> <div class="MsoNormal" style="margin-left:72.0pt"> </div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:">Plate “ring?” Or hammer knock? I don’t recall plate ringing being a problem. </span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:">Hammer knock is—among other things—a function of hammer mass and density. If you design an acoustical system that is relatively more efficient you can then use hammers that are relatively lighter and still get good performance. The top twenty or twenty-five hammers in the Fandrich upright were 9 mm wide and used relatively thin moldings and a less than normal amount of felt. I don’t recall just how heavy the tenor/treble hammers were just now but they were the lightest hammers used on any production piano at the time. </span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:">At the other end the bass hammers were 11 mm wide and the tenor hammers were 10 mm wide. This better blended the hammer mass curve through the bass-to-tenor transition. </span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:">ddf</span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:">Delwin D Fandrich</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:">Piano Design & Fabrication</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:">6939 Foothill Court SW, </span><span style="font-size:10.0pt;font-family:">Olympia, Washington 98512 USA</span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:">Phone  360.515.0119 — Cell  360.388.6525</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"><a href="mailto:del@fandrichpiano.com">del@fandrichpiano.com </a>— <a href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</a></span><span style="font-size:11.0pt;font-family:"></span></div> </div> <div class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"> <div class="MsoNormal" style="margin-left:108.0pt"><b><span style="font-size:10.0pt;font-family:">From:</span></b><span style="font-size:10.0pt;font-family:"> <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> <a href="mailto:%5bmailto:pianotech-bounces@ptg.org%5d">[mailto:pianotech-bounces@ptg.org]</a> <b>On Behalf Of </b>Gene Nelson<br> <b>Sent:</b> Thursday, May 24, 2012 1:25 PM<br> <b>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br> <b>Subject:</b> Re: [pianotech] David Love--Centeringthe bridge--was S&S something er other</span></div> </div> </div> <div class="MsoNormal" style="margin-left:108.0pt"> </div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="color:black">Did your treble design help eliminate or reduce or noticeably have any effect on plate ring? Especially in the top 5 or so notes?</span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="color:black"> </span></div> <div> <div style="margin-left:36.0pt"> <div style="margin-left:36.0pt"> <div class="MsoNormal" style="margin-left:36.0pt;text-align:center" align="center"><hr align="center" size="2" width="100%"></div> </div> </div> <div class="MsoNormal" style="margin-left:108.0pt"><b><span style="font-size:10.0pt;font-family:">From:</span></b><span style="font-size:10.0pt;font-family:"> <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> <a href="mailto:%5bmailto:pianotech-bounces@ptg.org%5d">[mailto:pianotech-bounces@ptg.org]</a> <b>On Behalf Of </b>Delwin D Fandrich<br> <b>Sent:</b> Thursday, May 24, 2012 1:14 PM<br> <b>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br> <b>Subject:</b> Re: [pianotech] David Love--Centeringthe bridge--was S&S something er other</span></div> </div> <div class="MsoNormal" style="margin-left:108.0pt"> </div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:">Well, that is what most of this conversation has been about. </span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:">At the time I was designing the 122 Fandrich vertical piano it seemed logical to me (and it still does) that it would be desirable to place the driving energy source of the vibrating diaphragm—i.e., the bridge—relatively close to the middle of the working part of the soundboard and its supporting ribs. The energy wave starts there and moves away from both sides of the bridge on across the soundboard to the mounting points and it seems a good idea that both arrive at more-or-less the same time. Since this was a new design and I could do anything I wanted I did so and was pleased with the results. It’s one of the best treble sections I’ve designed for any piano of any type. This was, to my knowledge, one of very few pianos that have been built with the treble section designed so the bridge could be placed relatively close to the center of the ribs. At least I can’t recall seeing any others. The physical construction of the grand piano makes it impossible and I don’t know of any upright piano designs that attempted it though there might well be some.</span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:">As may be, I got a combination of power and sustain out of this design that was noticeably better than anything I’d done previously. And this with relatively light and un-juiced hammers. </span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:">ddf</span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:10.0pt;font-family:">Delwin D Fandrich</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:10.0pt;font-family:">Piano Design & Fabrication</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:10.0pt;font-family:">6939 Foothill Court SW, </span><span style="font-size:10.0pt;font-family:">Olympia, Washington 98512 USA</span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:10.0pt;font-family:">Phone  360.515.0119 — Cell  360.388.6525</span><span style="font-size:10.0pt;font-family:"></span></div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:10.0pt;font-family:"><a href="mailto:del@fandrichpiano.com">del@fandrichpiano.com </a>— <a href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</a></span><span style="font-size:11.0pt;font-family:"></span></div> </div> <div class="MsoNormal" style="margin-left:108.0pt"><span style="font-size:11.0pt;font-family:"> </span></div> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"> <div class="MsoNormal" style="margin-left:144.0pt"><b><span style="font-size:10.0pt;font-family:">From:</span></b><span style="font-size:10.0pt;font-family:"> <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> <a href="mailto:%5bmailto:pianotech-bounces@ptg.org%5d">[mailto:pianotech-bounces@ptg.org]</a> <b>On Behalf Of </b>Gene Nelson<br> <b>Sent:</b> Thursday, May 24, 2012 9:37 AM<br> <b>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a><br> <b>Subject:</b> Re: [pianotech] David Love--Centering the bridge--was S&S something er other</span></div> </div> </div> <div class="MsoNormal" style="margin-left:144.0pt"> </div> <div class="MsoNormal" style="margin-left:144.0pt"><span style="color:black">Yes indeed. Can you talk a bit about the treble bridge as well? Without your redesign work the bridge would also be located near the end of a rib – not so desirable up there.</span></div> <div> <div style="margin-left:36.0pt"> <div style="margin-left:36.0pt"> <div style="margin-left:36.0pt"> <div class="MsoNormal" style="margin-left:36.0pt;text-align:center" align="center"><hr align="center" size="2" width="100%"></div> </div> </div> </div> </div> </div> </div>  </div> </font></font>