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**3rutu5** · 03-11-2023, 05:43 AM

Parts List

2x Dayton Audio ND65-4 drivers

https://www.parts-express.com/Dayton-Audio-ND65-4-2-1-2-Aluminum-Cone-Full-Range-Driver-290-204

Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Neo Driver 4 OhmDayton Audio's compact ND65-4 aluminum cone driver demonstrates the latest advances in high-excursion design processes. An efficient, low-distortion Neo-Balanced motor is combined with a rigid yet lightweight aluminum diaphragm, yielding impressive high-impact audio reproduction. Perfect for single point-source speaker applications, or combined in multiples and line arrays.

2x Dayton Audio ND90-PR Passive Raditors

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https://www.parts-express.com/Dayton-Audio-ND90-PR-3-1-2-Aluminum-Cone-Passive-Radiator-290-209

Dayton Audio ND90-PR 3-1/2" Aluminum Cone Passive RadiatorTune small enclosures with Dayton Audio's ND90-PR 3-1/2" passive radiator in speaker designs where a conventional port is not a viable option. This compact passive radiator includes all of the features you expect with larger radiators including high excursion capability, aluminum cone, rubber surround, and adjustable mass. Visually identical to Dayton Audio's popular ND series drivers, the ND90-PR can be used with any small speaker. The threaded rod and included wing nut on the back of the cone makes it easy to add mass to tune the radiator as needed for your projects. Whether you are building a multi-driver array, sound bar, or portable Bluetooth speaker, the Dayton Audio ND90-PR introduces a new range of possibilities.The ND90-PR 3-1/2" passive radiator includes: (1) Passive radiator (2) 7.3 gram disk weights (1) Wing nutSpecifications: • Fs: 53.8 Hz • Vas: 0.05 cu. ft. (1.5 liters) • Qms: 6.15 • Cms: 1.09 mm/N • Mms: 8.1g • Rms: 0.44 kg/s • Sd: 31.2 sq. cm. • Xmech: 9 mm • Dimensions: Overall diameter: 4.07", Cutout diameter: 3.35", Depth: 2.39".Tip: As a general rule, the passive radiator(s) should have at least double the displacement of air (Vd) as the active woofer(s)/subwoofer(s) in the system.To calculate Vd: Sd x Xmax = Vd

Bought the KAB 230v3 before the release of the V4. this is the only link for the older amp

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https://www.parts-express.com/Portable-Bluetooth-Ammo-Box-Speaker-Kit-Components-300-7301?quantity=1

Small Portable Bluetooth Ammo Box Speaker Kit ComponentsQuickly build a portable Bluetooth speaker with the Conceal Carry speaker kit. All the components conveniently fit into a 30 caliber style ammo box. You may have one of these metal ammo boxes lying around the house or plastic versions are available at most hardware stores. All you have to do is drill two 3" holes and cut out a 3-2/3" x 2-3/4" hole. All the wires plug directly into the boards without any soldering. Attach the speaker wires to the + and - on the speakers with 0.205" and 0.110" quick disconnects (sold separately) or solder the wires to each terminal. Screw down the speakers with the included screws and attach the speaker wires and you're ready to impress friends with a great sounding, 60W portable Bluetooth speaker. The on board Bluetooth antenna delivers up to 50 ft. of range. If you're mounting the board in a metal enclosure connect an external antenna (sold separately) to the antenna jack on the board. Add a little sound damping material (sold separately) to make it sound even better. Note: Crossover components may be substituted with parts of equal or higher quality depending on available inventory.

will be buying the KAB board, but currently have the LBB and a couple of the JAB (sure) boards.

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https://www.parts-express.com/Dayton-Audio-KAB-BE-18650-Battery-Extension-Board-for-Bluetooth-Amplifier-Boards-325-113

Dayton Audio KAB-BE 18650 Battery Extension Board for Bluetooth Amplifier Boards The Dayton Audio KAB-BE Li-Ion battery charging board holds three 18650 batteries (sold separately). This charging board has built in under/over voltage protection circuits for safe charging and battery longevity. It balances different voltages between batteries in case one battery discharges faster than the other ones. A 19 VDC, 1-5A power adapter works best for charging batteries contained in this board. Additional boards can be sequenced together to provide longer playing time.Please note: When removing batteries from the KAB-BE, the charging adapter must be plugged in momentarily after the new batteries have been inserted. Failing to do so will prevent the amp board from powering up.Specifications: • Included cable: 8" 4-conductor • Board dimensions: 2.68" H x 3.61" L x 1.15" W.

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https://www.parts-express.com/Dayton-Audio-LBB-3v2-3-x-18650-Lithium-Battery-Charger-Board-Module-12V-with-Charge-Protect-325-201?quantity=1

Dayton Audio LBB-3v2 3 x 18650 Lithium Battery Charger Board/Module 12V with Charge ProtectionTurnkey Solution for Portable Power The Dayton Audio LBB-3v2 makes harnessing the power of rechargeable lithium-ion batteries an easy endeavor. Simply install three 18650 lithium-ion batteries into the LBB-3v2 to get solid 12V performance. At a total current draw of 5 amps, this battery board produces 60 watts of power. Sometimes soldering to a circuit board can be intimidating. That's why the LBB-3v2 bypasses the need for any board soldering by providing JST sockets for reliable and convenient connections that allow you to take advantage of all the capabilities that this rechargeable battery board provides. The Dayton Audio LBB-3v2 is so easy to use, affordable and dependable, it opens the up possibilities for portable electronics projects and products that otherwise may not have been possible. Use the LBB-3v2 to create portable speaker systems, drive motors in robotics projects, power an array of LED's or make life simpler by employing creative iOT (internet of things) solutions. The sky is the limit when portable power is needed. This board offers three 12V DC output connectors to supply power to various items in your project or product. Remember, all connected devices will share 5 amps of current. Be sure that what you are connecting the LBB-3v2 does not draw more than 5 amps. By having multiple output connectors, it eliminates the need for a power distribution circuit, thus simplifying most designs. A remarkable point of versatility is that the Dayton Audio LBB-3v2 can recharge on a very wide range of voltages; from a convenient 5V source all the way up to a fast-charging 24V power adapter. You can even plug a solar array into the LBB-3v2 to keep a constant charge in sunny conditions. The recommended average output from the solar array is 19V, charging times will vary depending on the voltage and amperage provided to the LBB-3v2. Operate the Dayton Audio LBB-3v2 rechargeable battery board with confidence knowing that it provides robust overcharge and undercharge protection. This protection circuitry built into the board maintains safe operation and optimizes the lifespan of the three 18650 lithium-ion battery cells that are housed securely on the underside of the board. Another great feature of the LBB-3v2 is their array of LED status indicators. Directly on the board you will find a tactile push button that will tell you the battery charge level, indicated by four on-board LED's. In addition, you'll also find a power input LED that shows that the board is connected to a power source and a charging LED that lets you know the board is actively charging; it turns off when charging is complete. However, once you mount this rechargeable battery board inside an enclosure, the board and its indicators are no longer visible. That's why this board also comes equipped with JST connectors to bring all those status indicators to the outside of your project. By purchasing the Dayton Audio LBB-5CL (sold separately), you can bring all those important statuses to the outside of your enclosure. With easy to connect pre-terminated LED's, just plug the wires into their correct JST sockets and mount the LED's so they are visible. It's that easy. What's Included Dayton Audio LBB-3v2 Rechargeable Lithium-Ion Battery Board20" 2-conductor power output cable8" 4-conductor power output cable Specifications Output Voltage: 12 VDCInput Voltage Required: 5 VDC - 24 VDC, minimum 2AMaximum Current Draw: 5A MaxDC Coax Jack Size: 2.1 x 5.5 mm center (+) polarityBattery: Three 18650 Li-ion, recommended amperage at least 2600 mAhWidth: 3.61" (92 mm)Depth: 2.72" (69 mm)Height: 1.34" (34 mm) SpecificationsQ&AReviewsManuals & Resources

1x ESP32 development board with 2.8inch TFT screen (had to convert MP4 to GIF to upload to forum, not as choppy in real life)
and other slow boat items that list can be shared if anyone is interested in building such a elaborate project.

Trialling using hobby plastic putty to cover up the seams/joins and will paint this later once working. Even ordered some amp knobs with knurling to replace the 3d printed ones (3x 16mm and 1x 32mm), with the only usable on at the moment being the larger volume knob

Attached Files

**Brian Steele** · 03-12-2023, 04:52 PM

Noice.

If I was going to do this, I'd follow what the BT speaker manufacturers are doing for the better speakers - use larger enclosures, tune the PRs to a lower frequency (e.g. 50 Hz), and then use DSP to flatten or boost the response from where the driver starts rolling off down to Fb, and configure the DSP to reduce this boost as the output level is increase. This is how Mifa is able to get down to 50 Hz with the 2.75" drivers in their Wildbox BT speaker, even though the drivers themselves have an Fs of just under 100 Hz and a Qts of around 0.35.

BTW, I have a blown Wildbox on hand and one of my long-term projects is to reuse its drivers and PRs in a 3D printed BT speaker system with detachable speakers, like the better boomboxes from the late 80s / early 90s had (e.g. like the Sharp QT37). The center console can then be used to hold the electronics, or widened to hold a subwoofer as well. But I'll have to learn EVERYTHING about 3D printing and BT speaker design before starting, hence "long-term" project :-).

**tomzarbo** · 03-14-2023, 06:35 PM

This project is cool all over the place, but that tape image on the display just takes this thing to another level of retro.
TomZ

**3rutu5** · 03-14-2023, 06:47 PM

Originally posted by Brian Steele View Post

Noice.

If I was going to do this, I'd follow what the BT speaker manufacturers are doing for the better speakers - use larger enclosures, tune the PRs to a lower frequency (e.g. 50 Hz), and then use DSP to flatten or boost the response from where the driver starts rolling off down to Fb, and configure the DSP to reduce this boost as the output level is increase. This is how Mifa is able to get down to 50 Hz with the 2.75" drivers in their Wildbox BT speaker, even though the drivers themselves have an Fs of just under 100 Hz and a Qts of around 0.35.

BTW, I have a blown Wildbox on hand and one of my long-term projects is to reuse its drivers and PRs in a 3D printed BT speaker system with detachable speakers, like the better boomboxes from the late 80s / early 90s had (e.g. like the Sharp QT37). The center console can then be used to hold the electronics, or widened to hold a subwoofer as well. But I'll have to learn EVERYTHING about 3D printing and BT speaker design before starting, hence "long-term" project :-).

yeah i was thinking about it with the DSP and think that i might have a 2x50w Sure board with that DSP capability but need it for my actual Sharp rebuild that i have been putting off. With my 5v version i got to tweaking the DSP on the cheap chip and put a bass shelf on it and you could really tell the difference with how it performed with the tiny DMA45's.

If this works out with how it all gets assembled in the end i might try a full sized printed version where i sneak a sub into it like those ammo cans you see. Just need the right amp/PSU/Speakers for that one, but a future future project i suspect.

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Latest 3d Printed BT project.

Latest 3d Printed BT project.

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