I think a pipe with a speaker in the end is considered a closed end cylinder, but I am not completely sure. If so, resonant lengths are shorter. Here is the page from one of my favorite websites if you are interested in experimenting with resonant speakers:
http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/opecol.html#c1 Good educational website from Georgia State University. Mark, KE6BB On Friday, February 17, 2017 2:14 PM, Mike Furrey <mikefur...@att.net> wrote: I have not but you certainly can do it. The length of the tube will determine the peak resonant frequency and you would have to experiment with the length to tune it to the pitch you like best to listen to. Remember the days you would blow across a bottle to make a tone? The more you drank out of the bottle the lower the pitch. I like this project and I am going to build one and it will be with a straight tube mounted on a little stand so it aims towards me. 73, Mike WA5POK On Friday, February 17, 2017 12:58 PM, P.J.Hicks <hickspj...@comcast.net> wrote: Has anyone built the resonator with a straight length of tube? Perhaps terminated with a 45 deg. cut? Might be an interesting experiment. The 45 deg long radius street elbow in 2" is an order only item in my area so thought I'd substitute a straight length. PJH, N7PXY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to mikefur...@att.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rv6am...@yahoo.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
