4" Back Horn Speaker V2.0 - Bluetooth, Active, Passive

<img src="http://www.alpinehiking.eu/imgs/Speaker_Banner_640.jpg" alt="">

The full set of stereo components (and plenty of other stuff): https://www.thingiverse.com/guppyk2/collections/my-stuff

<b>UPDATE 19Feb20:</b> The new <b>isobaric subwoofer</b> is now online:
https://www.thingiverse.com/thing:4765663

<h3>So here it is, the 4" version of the back horn speaker V2.0:</h3>

<b>This design is largely identical with the original design but with a few improvements/changes:</b>
- The speaker is now designed for a 4" (10 cm) driver (rather than the original 3 - 3.3")
- Some minor changes to the internal body design (more rounded corners etc.)
- The side panels are now easier to mount (thanks to pins on the panels that fit corresponding holes in the body)
- New speaker ring, which allows for mounting the driver from the outside (makes changes at a later stage easier)

<b>Ideally use in a 2.1 setup.</b> Currently working on a fully printable subwoofer (UPDATE 10Feb21: Subwoofer is almost done, expect publication on 19 Feb), e.g. with https://www.thingiverse.com/thing:4743037


Remember, printed designs have a few inherent limitations. One is simply the size of what can be printed on a standard 3D printer (most back horn speakers you will find are rather room-filling, both in terms of sound as well as size), so even the 4" version is still very much a down scaled version. Second is the material. Printed surfaces are very reflective (so add some damping to the…