Hi, I think you mean 200 hertz not megahertz....unless your audience consists of "my favorite martian". What about Helmholtz resonators? They are tuneable to specific frequences so could be used like a "notch" filter. At 09:09 AM 3/22/2003 -0800, you wrote: >I went online to check on bass traps for my local community concert venue. >I have a problem with the 200 mhz range. I'm wondering whether or not I >need to put these acoustic bass trap wedges in all four corners or just >behind the stage? Looks like around $50 for a 4 foot piece.... > >David I. >----- Original Message ----- >From: "James Ellis" <claviers@onemain.com> >To: <caut@ptg.org> >Sent: Saturday, March 22, 2003 7:55 AM >Subject: Recital Hall Acoustics > > >> Wim Blees certainly got the most for the money if his $500 worth of >carpet, >> wooden strips, and screws solved the problem. That's about what I would >> expect an acoustical engineer to have charged for a one-time evaluation. >> Charging $10,000 for an evaluation, in my opinion, is way out of line. >> After all, this is a recital hall, not the Cathedral of St. John the >Divine >> in New York City with its 200 x 600 ft. nave, and dome high enough to >> accommodate the Statue of Liberty. >> >> Carpet will work wonders for damping out the high frequencies, but it will >> do little for the mid-range, and nothing for the low frequencies. In >Wim's >> case, it seems that damping the high-end frequencies was sufficient to >> solve the problem. >> >> I mentioned the commercially available panels to inform those facing >> similar problems that all sorts of options are available to them. For >> those who have had any experience in this area, common sense will tell you >> what you need to do. Hard, flat, parallel side-walls, and hard curved >rear >> walls that bring reflected sound to a focus up in the seating area are >> killers. This is so obvious, and yet it happens all the time because too >> many architects seem to know nothing about acoustics. >> >> Jim Ellis >> >> >> _______________________________________________ >> caut list info: https://www.moypiano.com/resources/#archives > >_______________________________________________ >caut list info: https://www.moypiano.com/resources/#archives > > Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. mailto:pianotuna@accesscomm.ca http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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