The proper material is accoustically transparent such as grille cloth, usually purchased from Schaff. But I have used cloth fabric to "match the decore" and still have no complaints about its use. Paul Chick ----- Original Message ----- From: "Don" <pianotuna@accesscomm.ca> To: <pianotech@ptg.org> Sent: Monday, May 20, 2002 8:56 AM Subject: Re: back covers for vertricals > Hi Paul, > > What is the proper material please? > > At 08:43 AM 5/20/02 -0500, you wrote: > >Bill > >I've installed bacovers on piano backs for 25 years with the proper material > >and have had no complaints or comments about their affect on the piano > >sound. > >
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