Bluetooth Speaker - Quarter Wave Transmission Line
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After seeing a post on the CR10 Facebook group by Jason Bach, I decided to design my own 'quarter wave transmission line' Bluetooth Speaker - inspired by his work.
This thing is incredibly loud for it's size and the audio appears to be very nicely balanced considering this is made of plastic. It doesnt rattle or vibrate in any unwanted ways.
See video: https://youtu.be/yui068SL0e0
I had originally planned to sand and finish this, but the print came out so good, I just left it as it is.
This project requires 2x 3" speakers and a Bluetooth dual channel 50w Amp - Total cost about £30.
All of the parts mentioned in this project can be bought from ebay.
Full Bill of Materials below.
Firstly, I am not an audiophile. Nor do I know a huge amount about speakers and sound systems. I used some basic math to work out the required dimensions for the enclosure and the transmission line. The math revealed I needed a transmission line (or port/resonator) length of approx 777mm and its dimensions needed to be approx 90mmx33mm.
It's important to use the same speaker drivers as me (listed below), as the enclosure was designed specifically for their respective 'free air resonant frequency' and 'effective cone area'.
You can find out more about 'Quarter Wave Transmission Line' speakers and the math involved in a video link I posted in the comments section of this thing. It's similar to the wave technology Bose use. From watching the video, you could design your own…
