Back Horn Speaker BL1 - Bluetooth, Active, Passive
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<b>UPDATE 28 Nov 20:</b> I have just uploaded <a href="https://www.thingiverse.com/thing:4668173">Version V2.0 - a complete redesign using a 3.3" driver</a>
<b>UPDATE 18 Dec 20:</b> I have just added a wiring diagram - Enjoy!
Just a super stylish, super cheap, fully printable and surprisingly good sounding back loaded horn Bluetooth speaker using a simple 2 1/2" driver and a USD 1 Bluetooth board and amplifier.
First a little theory: What is a back loaded horn speaker? Think of it as a reversed megaphone or gramophone. A (front) horn loudspeaker uses an acoustic horn to increase the overall efficiency of the driving element (i.e. the sound coming out at the front). A back loaded horn speaker does pretty much the same. However, here the horn is mounted at the back of the loudspeaker. So you get the direct output from the front of the driver PLUS the one from the horn at the back. Which frequencies are amplified and how well depends on the air chamber, throat (the narrow part), and on the length, design, and diameter of the horn. Particularly with small (and cheap) drivers this can very much improve the sound quality.
It is like kissing the frog. You kiss that tiny loudspeaker and hope it turns into a prince. Well it did, kind of...
This enclosure is for a 2 1/2" (6.5 cm) driver I had lying around (working on something slightly bigger, slightly more expensive so stay tuned). You can use it as a Bluetooth (as I do), active, or passive speaker. I have added a small…
