[Elecraft] (OT) CW Resonant Speaker

[jrquark]

The confusion here is a common one, closed vs open ended resonators, especially if one looks at the poorly explained graphs in most physics texts.

The speaker, attached to one end of the pipe, is not the closed end, it is open, since it drives the air particles at that end, and that makes it a displacement antinode, where the particle displacement is maximum.

Jim - K7BIE


> On Feb 17, 2017, at 9:43 PM, Joe Subich, W4TV <lists at subich.com> wrote:
> 
> A cylinder with a speaker in one end and open in the other is an "open"
> cylinder (open pipe).  It is a *half wave* in air which means the
> formula uses 2f instead of f.