bluetooth speaker

By Sam
|
BY-NC-SA 4.0 License
|
Updated Tue Sep 24 2024

A battery powered bluetooth speaker, with a dsp driven active crossover you can program to your liking. Charges via USBC, can accept a 3.5mm input which enables you to play an instrument over Bluetooth music. I made this one so my daughter would have a little station to practice on her synth, listen to music and set up audio books on her tablet. No soldering requires. It has stereo dipole planar magnetic mid/ tweeters, and a slim 6.5" woofer in its own sealed enclosure, sounds great

1 hr
Intermediate

4

Electronics

Files Included (7)

  • angle_baffle_v002.svg

    16 kB
  • back_v002.svg

    5 kB
  • bottom_v002.svg

    11 kB
  • front_v002.svg

    32 kB
  • insert_v002.svg

    34 kB
  • Side_v002.svg

    15 kB
  • top_v002.svg

    11 kB

Materials

cut knobs insert out of acrylic

cut all other items out of 3/4" mdf

Tools

Origin

-1/4" cutter

-1/8"

-1/16"

hand router

- 1/2" radius following bit

- 1" wide 45 degree chamfer following bit

Instructions

The instructions are a work in progress, ill add more info as needed, message me on this forum post to ask any questions: https://community.shapertools.com/t/bluetooth-speaker/13917 Test fit drivers and insert when cutting pockets. 2x angle baffle need both ends trimmed at 20 degrees ( see exploded diagram ) 2x side need one end trimmed to 20 degrees dry assemble. before glue up ( double check the orientation each panel, particularly the top and bottom ) perform glue up with the project upside down glue and brad nail in place parts: accessory knobs and cables: $10 ( power switch, aux plug, knobs etc ) https://www.parts-express.com/Dayton-Audio-KABD-SPF-Function-Cables-for-KAB-DSP250-325-117 ac adapter: $18 ( optional, if you don't aim to charge with usb ) https://www.parts-express.com/19.5V-DC-3.33A-AC-Power-Supply-Adapter-with-2.1-x-5.5mm-Tip-Plug-120-195 battery charge board: $25 https://www.parts-express.com/Dayton-Audio-LBB-5Sv2-5-x-18650-Lithium-Battery-Charger-Board-Module-21V-with-Charge-Protect-325-210 tweeters: $50 x2 https://www.parts-express.com/GRS-PT6816-8-8-Planar-Slim-Tweeter-8-Ohm-272-128 4x30watt amp: $70 https://www.parts-express.com/Dayton-Audio-KABD-430-4-x-30W-Bluetooth-Amp-Board-with-DSP-325-430 18650 batteries: $20 ( need 5, must have flat ends to fit ) https://www.parts-express.com/5-Pack-18650-2600mAh-Li-Ion-Flat-Top-Rechargeable-Battery-142-105 dsp programmer: $34 ( this can be used to program other projects it is not installed with the amps ) https://www.parts-express.com/Dayton-Audio-KPX-In-Circuit-Programmer-USB-325-139 woofer: x1 $120 https://www.parts-express.com/Tang-Band-W6-2253S-6-1-2-Low-Profile-Subwoofer-264-937 crimp connector kit: $30 https://www.parts-express.com/300-Piece-Speaker-Crimp-Connector-Kit-095-900 crimp tool $20 https://www.parts-express.com/Ratcheting-Crimp-Tool-For-Insulated-Terminals-360-642?quantity=1 panel mount usbc: $16 https://www.amazon.com/dp/B0D17GSDLZ Usbc to 20v converter: $15 for 2 https://a.co/d/7Ahe9vZ 3/4" mdf: 24" x 48" is plenty 1/8" acrylic: ( cast preferable, you can use any 1/8" material here ) titebond wood glue: paint: standoffs: ( to mount https://www.amazon.com/gp/product/B0B7SN13YR m3 threaded insert kit: $25 https://www.amazon.com/gp/product/B015CAPTZI M4 threaded inserts: $10 1/16 thick foam gasket: zip ties / cable management: ( needs work ) programming the amp / dsp: parts express sell these amps as dayton audio: https://www.parts-express.com/pedocs/manuals/325-139--dayton-audio-kpx-programmer-user-manual-v2.pdf but they are rebranded wondom boards, Dayton Audio KABD-430 https://www.parts-express.com/Dayton-Audio-KABD-430-4-x-30W-Bluetooth-Amp-Board-with-DSP-325-430 is the same as a Wondom Dsp, JAB4 https://store.sure-electronics.com/product/AA-JA33285 Wondom ( Sure Electronics ) have more complete documentation for more advanced dsp programming: https://store.sure-electronics.com/upload/download/1/The%20basic%20SigmaStudio%20programming%20guide%20for%20ADAU1701%20DSP%20Products285.pdf ############## alternate cheaper mono build build below ################ To save a bunch of money you could adapt this to a mono version with just a tweeter and a woofer. the design would need to be adapted though. cheaper woofer: $15 ( 50 - 1500hz ) https://www.parts-express.com/GRS-6LPSW-4-6-1-2-Low-Profile-Subwoofer-4-Ohm-292-461 cheaper smaller tweeter: $40 ( 800hz - 20k ) https://www.parts-express.com/GRS-PT2522-4-3-1-2-Planar-Tweeter-4-Ohm-272-122 amp 2 x 30w: $30 https://www.parts-express.com/Dayton-Audio-KABD-230-2-x-30W-Bluetooth-Amp-Board-with-DSP-325-106 Wire: 1ft red +1ft black Solid core to connect USB adapter to battery charge board. internal notes for me to fix / improve: add protection over woofer. add feet detail improve cable routing improve amp mounting details ( L plate parts express sells? ) test the larger battery option bridge the output of 2 channels to power the woofer insert improvements: - holes on under side of insert to capture knobs check encoding - hole for bluetooth pairing button - hole for powered on LED light - provide a better means of isolating the insert from the woofer driver


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