Plan For Transmission Line Speaker Cabinet Using 8" Main Driver
Here's a design for a reasonably compact, quarter wavelength transmission line speaker using an 8" main driver. I drew this up about twenty years ago and it's all in imperial measurements. The effective overall length of the acoustic line is a little over five feet, giving a port cut off of around 35Hz, taking into account the roll off below this point, with a decent lowish resonance bass/bass mid unit, there should be useful output to 30Hz or below. I actually built this and got some very solid deep bass output. Don't forget you will need damping material, the bulk of which should go towards the wide (driver) end of the acoustic line, but don't go mad or it'll spoil the sound. If you use a full range driver, you won't need a tweeter, if you need to fit a tweeter mount it on the lower front panel as close to the upper main driver as possible. It's my own design and there's no copyright, so feel free to use it as you like. Any questions, just ask!
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