Speaker Box for 3 inch Driver + 4" Passive radiator v4
3D printed speaker enclosure. This is a 'What would I improve after doing the first one' project.
Based on my 'Speaker Box for 3 inch drivers v3' (Which sound Amazing BTW) with slightly bigger drivers.
The purple speaker pic is are the 3" model - I haven't made the "Perfected" v4" model yet.
Speaker openings and screw holes are sized to fit . . .
----- Dayton Audio RS75-4 / 3" Reference Full-Range Driver 4 Ohm - $30 -----
This little speaker really cranks with a truncated 2.5" cone. It should sound even better at full 3".
The full range driver has no need for a crossover. It sounds pretty good just wired up w/o a box.
----- Dayton Audio DMA105-PR / 4" DMA Series Passive Radiator - $11 -----
I have learned that a passive radiator should be bigger than the driver. This has a 4" PR vs. the 3" one I used.
I can't wait to hear better bass from the 4" passive radiator.
I wanted to make sure the speakers were very stiff and did not have internal resonance and reflections.
I started with a simple box and added random triangle reinforcing ribs on the inside.
The ribs will also reflect sound of various frequencies all over the place.
The first print took 36 hours, and used about 700g of filament. I tried to reduce that.
(26 hours 536g filament = slicer prediction)
The side panels and back door are lined with foam rubber using silicone glue. No foam on the top and bottom, for mysterious audio reasons? I also used silicone to seal the door and wire openings airtight.
I used 12 x #8 - 1" self-drilling screws for the drivers and back door.
Previous Updates to v3.
Painted the front panel around the speaker bezels black. Just for looks. Most of the speaker is still purple.
Made revisions to improve the model based on the print.Fixed the speaker frame holes ~1 mm bigger for better fit. The top speaker frame was 1/2 mm too large for the hole.Reduced un-needed complexity and weight.Kept the triangular reflector baffle ribs, but reduced the height of each triangle.Improved the back panel recessed into speaker mating.I caulked the back door perimeter and speaker wire hole to seal it.Designed using Onshape