Elder Bluetooth Speaker




About: Hello! I'm Kirby and I like to build speakers and teach others how to do what I do. You can find most of my videos on YouTube though the "Web Site" link in my profile. I hope I can inspire a few of...

My goal for the Elder Bluetooth Speaker was a speaker that could fill a large room with full sound and look great doing it. In this build I'm using reclaimed redwood for the front baffle, which works well and sounds great, but you can use any aesthetically pleasing wood. I've found hardwoods sound the best. The enclosure is made from solid pine. I chose this for it's looks after being stained and because the font and back will have an exposed edge. You can use plywood for the enclosure, but you would want to edge band it.

This will be an overview of this build.

Get detailed plans with crossover and templates HERE

Get a build kit with all these speaker components HERE

Find more speaker building videos HERE

Step 1: The Guts & Stuff

This speaker is based around the Dayton Audio KAB-230 Bluetooth amplifier. 60 watts is plenty of power to fill a large living room with quality sound.

I would consider this an intermediate build. Some woodworking practice will help, but an ambitious newbie can pull off this build as well.

Materials Needed

Bluetooth Amp - https://goo.gl/nbQH0a

Cable Kit - https://goo.gl/gZwm37

Woofers x2 - https://goo.gl/TyzNA6

Tweeter - http://amzn.to/2e8VYGB

Back Plate - http://amzn.to/2e8VYGB

Port Tube x2 - http://amzn.to/2e8VYGB

Aux cable - http://amzn.to/2e8VYGB

Power Adapter - http://amzn.to/2e8VYGB

Knob - http://amzn.to/2e8VYGB

Power Connector - http://amzn.to/2e8VYGB

Switch - http://amzn.to/2e8VYGB

Ebony Stain - http://amzn.to/2fpg2B3

Finishing Oil - http://amzn.to/2fe7XhY

Pine Boards

Hardwood Boards

.5" Ply Wood

Tools Needed

Drill - http://amzn.to/2fEwU9x

Jig Saw - http://amzn.to/2fQMAGZ

Circular Saw - http://amzn.to/2eM3uSZ


Miter Saw - http://amzn.to/2feebhB

Straight Edge - http://amzn.to/2eCrA4V

Router - http://amzn.to/2eskH33

Router Table - http://amzn.to/2fuVdCN

3" Hole Saw Drill Bit - http://amzn.to/2fbi6ik

Forsner Bit Set - http://amzn.to/2fQItL5

Drill Bit Set - http://amzn.to/2eCu9Ea

Soldering Iron - http://amzn.to/2djSPjh

Glue Gun - http://amzn.to/2djSPjh

Center Punch - http://amzn.to/2djSPjh


Get crossover details and templates HERE

Step 2: The Box

Start with your pine boards. Set your miter saw or circular saw to a 45 degree angle and cut two 20" and two at 5.5". Make sure to cut both 45 degree ends inward. Next, set your table saw or circular saw at 7" and rip each board to 7"

Now it's time to cut the rabbet for the front and back baffle. I use a 1.25" mortising bit in a router and router table, but you can also make these cuts on a table saw. Cut the front rabbet at .75" and the back at .5". Cut it about a half inch deep. Make a few test cuts to be sure you have the correct depth.

Lay out each piece across a straight edge, and using painters tape, tape up each joint. Flip the piece over and glue each joint. Fold each piece until you've created a box. Glue and tape the last joint and there you go! You got a box!

Step 3: The Face

Measure the inside of the front opening of your box. Transfer those dimensions to your front baffle wood and cut it using your table saw, circular saw, or miter saw. Be sure to place the front baffle into the box for a test fit. Make adjustments as needed.

Mark out where you want the speakers to be and cut out the holes. I used a chamfer bit to cut a bevel into the inside of the speaker cutouts.

Make sure to test fit your speakers!

Step 4: The Back

Just like the front, measure the inside of the back of the box. Transfer those measurements to a piece of .5" ply wood and cut it out. Again, test fit the baffle to make sure it fits correctly.

Mark where you want the control plate and bass tubes to be placed and cut them out using a jig saw and drill.

Step 5: The Finishing

Sand both the box and the front baffle with 220 grit sand paper. You can go down to 320 grit if you'd like.

Finish the front baffle with finishing oil or clear spray paint. I stained my enclosure with ebony wood stain and finished it with matte clear spray paint.

Step 6: The Components

Place the woofers in their positions and mark the screw positions. Drill out the holes and use small screws to secure the the woofers to the inside of the front baffle. Take care to not drill through the front baffle and make sure your screws are short though not to poke through. Solder the speaker wires included in the kit to the speaker leads.

Get details on the crossover used HERE

Mark and drill the positions for your amp controls and LED indicators on the control plate. Add the controls and indicators to he plate, then add the plate to the back baffle.

Pop in the bass ports and your back is ready to go!

Step 7: The Finishing Bits

Run a bead of glue along the inside lip of the front of your box and press in your front baffle. Apply pressure to the piece for at least twenty seconds.

Drill and screw in the feet of your speaker.

Add dampening material to the inside walls of your enclosure, including as much as you can on the back baffle.

Solder your switch and power connector leads and connect them to the amp board. Connect all other connectors to the amp board. Find a location for your board and screw or hot glue it to the inside of the enclosure.

Place all the wires within the enclosure and screw in your back baffle. A little weather stripping is a good way to seal up the enclosure.

I have lots of other speaker building videos on my YouTube Channel if you want more!

Step 8: The Sound Test

Take a listen to how it sounds!

Thanks for watching!


Step 9: Detailed Plans

If you are looking for detailed plans, crossover components, and templets, check out my build plans HERE.

I aslo have Elder Bluetooth Speaker Build Kits available HERE.

Amps and Speakers Contest 2016

Second Prize in the
Amps and Speakers Contest 2016

Glue Challenge 2016

Participated in the
Glue Challenge 2016



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16 Discussions


1 year ago


I am selling my gear check out if you need it



2 years ago

I really liked your speaker designs so much I ordered all the parts and paid for your detailed plans with cross-over templates. On the 2nd-order Chebychev detail plan you list only C1,C2 - L1,L2 but on components list you have 3 inductors and 3 capacitors so where do the other two go. I have tried email you but no answer I'm not good at all with electronics but a wiz at woodworking so I like to get started on your speaker build.

1 reply

Reply 2 years ago

Update: With no help from you I finished the wiring with help from JasonR at parts-express. On your detail cross-over plans you Failed to mention that you need to build 2 cross-over one Hi-pass/Low-pass And a Low Pass without the Second cross-over the sound is mono.


2 years ago

Beautiful build and extremely informative. I can't wait to build one (or three) of my own.

I noticed that you used softwoods (pine and redwood) for this build but mentioned that hardwoods work better for sound quality. In your opinion, how much of a difference did it make in the quality using the softwoods and did the dampening material make any change?


2 years ago

can we use any bluetooth amp aslong as it has the same specs? e.g. 2 x 30 watts


2 years ago

Awesome looking speaker! Well done!

Given the amp is stereo, I assume you use a channel of the amp per woofer, so how is the single tweeter wired in? Is it just wired to one channel?


2 years ago

I love this type of design Kirby, I utilized something similar in my Bluetooth speaker as well.


2 years ago

Thanks for sharing this contest. I posted an entry after seeing your YouTube video. I love all of your builds. ?


2 years ago

Fantastic looks amazing!would love to make this If could find the time!:)

1 reply

2 years ago

Now hands up how many here actual have all these fancy tools?


2 years ago

Pretty cool!

Perhaps I missed it, but what's the significance of the name "Elder" . . is this for old people?

2 replies

Reply 2 years ago

Thanks! Haha no, no. It's one of the bigger power speakers I've made, so I decided to call it Elder.


2 years ago

I all can say is, wow, props. You've got some mad skills. The video is extremely well produced and educational. I wish there was more on the wiring portion but it is still incredible. The build is very professional and the outcome is dazzling. Well done.

1 reply

Reply 2 years ago

Thanks so much for your kind words! That really means a lot. I'm glad you enjoyed it!