SBBB bluetooth speaker

It's a Small Box with Big Bass

(at least that's what i want it to be...) https://youtu.be/05p6EjRsf4E

Note : the microphone of the camera really doesn't do justice to the sound :-/

Features :

• True extra bass sound system with Xtra Long Pass (© XLP) passive radiator, doesn't sound as cool as it's name but not bad either
• class D amp between 10-15w rms
• 2x 18650 battery (should get 10 hours at reasonable level)

What you have to put inside :

• SQ 251 4ohms speaker https://fr.aliexpress.com/item/4000540507550.html
• passive radiator 40*70 https://fr.aliexpress.com/item/4001014691399.html
• pam8610 with integrated bluetooth https://fr.aliexpress.com/item/32732590506.html
• dc step up that could handle 2A or more from ~4V input to 15V output

The one in picture is pretty decent

• some capacitor to smooth current spike (I put 2200 + 3300 /25V at the amplifier voltage input and 2200 10V at the step-up input)
• one power button, one Led with it's resistor and 3 push button
• a USB plug, I put one diode (1n4004) on it to charge the li-ion
• 2x 18650 lion in parallel (you could go with only one if you want)
• some screws
• soldier skill and a creative mind, this is not a ready to assemble kit, for example you have to figure out where to drill

Some hints :

• print with at least 50 % infill or more to make the box sturdy
• Glue everything inside before the last closing to avoid any rattle
• add some light foam or glass wool
• Make the box as watertight as possible to improve bass (I put some tyre tube on the back but you should better glue it all or "PLA solder" it)
• glue the border of the passive radiator
• do the wiring in order to be able to charge it even when it's off. The power button should be on the li-ion to be sure that when it's off nothing discharge the li-ion

Listening test :

• It's definitively louder than my JBL go2 which was the goal !
• I find it pretty descent with correct bass response.

Note that the one in picture is a prototype with different speaker

The original solidworks files are here, feels free to mods as you want !

I only demand some pictures of your creations ^^

Print Settings

Rafts:

No

Supports:

Resolution:

200

Infill:

Filament: PolyMaker PLA

Category: Audio