Enclosures for BMR ambient tweeters

This is an enclosure for the Techtonics Elements model TEBM35C10 BMR drivers. https://www.parts-express.com/tectonic-tebm35c10-4-bmr-2-full-range-speaker-4-ohm--297-216

In this enclosure they can play down to about 200Hz, but I use them only from about 1500Hz.

Edit: I also made a plate that mounts four of these into an array, tilted upwards at 25 degrees, to radiate across a wall. The STL for that is included.

BMR drivers basically spread sound in all forward and side directions. The idea of these enclosures is that they can be mounted to the backs of larger speakers or on wall surfaces, aimed upwards and to the sides. When driven with (preferably delayed, such as with DSP) higher frequencies from the program, they liven up the room sound making it sound more as if you are in the same room with the musicians, while still retaining imaging precision and basic sound character from the mains speakers. This is a similar effect as some audiophiles get from using dipole type speakers or placing narrow speaker cabinets far out into the room, but can be done is smaller spaces and is a much more versatile approach.

Each enclosure takes about 3hrs to print, using a 0.6mm nozzle. You can use the more common 0.4mm nozzle instead, but printing will take longer.

I've also included a mounting plate that could be used to place 4 of them on top of main speakers and aim them 25 degress up and in an arc to reflect off the wall behind. Wire the drivers in series-parallel for a 4 ohm total speaker load.

There's more about this, and some discussion, at the diyaudio.com website: http://www.diyaudio.com/forums/multi-way/326055-ambience-tweeters-using-bmr-drivers.html

Print Settings

Printer:

Folgertech FT-5

Rafts:

No

Supports:

No

Resolution:

0.375

Infill:

40%

Notes:

The inside of the enclosure is ribbed to reduce the amount of filament needed while keeping needed stiffness. Upward slopes are graded so that most printers should have no trouble from overhangs.