Easy Bluetooth Subwoofer Speaker (80W)




Introduction: Easy Bluetooth Subwoofer Speaker (80W)

Hi everyone!

Again I found some old speakers which we didn't use so I thought lets make something nice of them :)

I designed a wooden box to put them in and this time I was looking for some nice wood.

The speakers I used are:

- Subwoofer 40W speaker

- Left and right speaker also about 35W

I bought an amplifier on ebay for 10$ and it works actually very good!

I use this speaker on my room and it has bluetooth so very handy to play music.

Step 1: Collect the Parts You Need

What do you need?

- Amplifier:Ebay

This subwoofer amplifier has a 40W subwoofer output and 20W left and right output.

If you got some higher power speakers you can use another subwoofer amplifier like this from Ebay

I should not recommend the amplifier I used because it was diy kit so I needed to solder every component separately.

- Bluetooth usb:Ebay

Still the best option for easy bluetooth installation and has a good bluetooth range.

The aux input can also be used so you have a double use of the bluetooth usb.

- 12V to 5V converter:Ebay

This module is used to convert the 12V from the power supply to 5V to power the bluetooth usb.

- 12V DC adapter:Ebay

You will need 2 of these to power the amp and the '12-5V converter' for the bluetooth usb.

- Speaker

I had some speakers laying around from my dad's old car, so I tought let's make something useful with them!

- Switches: Ebay

I used toggle switches, one to power on the speaker amp and another to power on the bluetooth module.

- Wood

My father brought me some wood in 2 colors so I could combine the grey and black to give it a nice look.

- Wires


Step 2: Put Electric Parts Together

Bluetooth usb

First you need to open the bluetooth usb and solder wires to the tabs I marked with L, R and GND.

Now you need to connect these 3 wires to the aux input of the amplifier to transfer the audio from the bluetooth usb to the amplifier.

Plug your usb into the 12V to 5V converter, and power the converter with 1 of your 12V power supplies.

Power supply

You only need to plus 1 socket into the wall, so open the power supplies and connect both input voltages together. Use the one plug and put the plug into the wood case so you can put you power cable into it.


I putted 2 switches into the speaker.

The first one will cut the main power (230V) so no current can flow through the power supplies when powered of.

The second switch is placed between the 12V PS and the 12V-5V converter.


Connect the speakers to the inputs marked in the pictures.

Step 3: Make the Enclosure of the Speaker

Drilling holes

I made holes for the speakers, switches, volume knob, power on LED, AUX input.

Glue and screws

In the next step I glued all parts on the wood and after these were dry I could glue the hole speaker together.

I screwed the back panel so I could always open it. I also made a hole in this backpanel to glue a pvc pipe.

This is used so the air can escape while the subwoofer is doing his job.

Here are some pictures during the assemblage, but I forgot to make a lot of pictures so if you have any questions ask me ;)

Step 4: Giving the Final Touch to the Speaker

If you have any questions, feel free to ask anything!

After I made this I thought it would be nice to make batteries inside, so they would be charging the whole time, but when you want to take the speaker outside, it will be powered due the batteries.

Maybe an idea for some ;)

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    35 Discussions

    What are the dimensions of the larger pieces of wood and the smaller? I just saw this and loved it! Currently gathering materials to build it


    11 months ago

    nice works, its mature combining

    Very stilysh! Good job!

    simple & beautiful

    Wow!! This is awesome. I would like to put these all over my house. I love your batteries idea for making it mobile as well. It would be cool to waterproof one so you didn't have to worry about having it out by the swimming pool. Keep up the good work and great instructables!!

    1 reply

    Thanks fro the tutorial, though the adfly links are a bummer :(


    1 year ago

    This is great But I suggest a Partition to be added for Subwoofer compartment. Otherwise it will cause smaller speakers to resonate and introduce distortion.

    your speaker looks really awesome but u should use a better Bluetooth module. Actually, this type of Bluetooth module produces so much of noise. Anyway i really like the design.

    3 replies

    Yeah I know what you mean, but it's only noticable at very low volume so when I'm listening to music at normal volume level you can't even hear it.
    There are also small modules you can put between your aux to filter that bit of a noise.

    What I found after experimentation was that the noise was feeding back through the power connection and contaminating the entire signal path. The little modules I mention above isolate the BT module's noise, but allow the DC to pass into it. And figuring it out nearly drove me to drinkin" :).

    If you mean that "tweedle-deedle" electronic noise you hear when listening to music over a BT connection, then I have something for all of you folks! I'll create a separate comment above to describe what I did.


    1 reply

    dissable ad blocker, wait 5sec and skip right above that's all

    First of all, yours is a beautiful design. And your woodworking skills are awesome.

    Now, as promised, a way to practically eliminate the noise cause by those Bluetooth adapters.

    I build tube amplifiers. I have added BT to several using the Sure Electronics module "KT Gadget" links to. These are great modules and very quiet. But they are still kind of large for building a smaller amp. I was at a trade fair and a fellow told me about the "Tiny Sine" BT modules. About 1/3 the size, so easy to tuck into smaller spaces. But noisy! I added a 3300mF cap at the circuit board voltage input which helped. But when I want to hear Sarah McLachlan (my dream girl) sing "Angel" live, I don't want to hear R2D2 screaming in the background.

    A little "Googling" and Lo and Behold!


    If the link is bad, search for part number B0505S-1W.

    This is a 4-pin SIP chip. connect the 5 volt supply + to the input, the + output to the BT module, connect both negative terminals together and connect them to the supply and the BT module. I tried not combining the negative terminals, which killed R2D2 but the floating ground on the module caused 60 cycle hum that was worse that the original noise. I can now crank up that amp full blast with no music and not a peep of beep! And at under $2 shipped you can't lose.

    1 reply

    How many amps for the 12v to 5v power supply?

    Nice adfly links and dutch ebay pages...

    That is pretty awesome, I'm thinking of building one instead of buying another Bluetooth speaker. Thanks for sharing.


    1 year ago


    Another great instructable. I made a 2 x 3 W bluetooth speaker as per one of your other instructables. I realize English is not your first language so please take this in the spirit it is given. Hole in English is "gat" in Dutch and whole is "geheel".