Bluetooth speaker (ported enclosure, 8cm driver)

thingiverse

How this project came to be? --------------------------------------- During the January lockdown I found Guppyk's project of his TL speakers. I ordered the filament (three reels of Prusament PETG, 80€ shipped), and the speakers (30€ for the pair shipped), not to mention the gold plated banana plugs (around 15€ shipped for four pieces) and I wasn't overwhelmed with the results... well, shit happens, I just flushed 125€ and a week of time down the toilet... I went back to the design's comments to warn others not to do the same thing as I did, and then I found jojolll's bass reflex design. I was careful, so I printed only one speaker, and didn't assemble it until a few days ago (that's late August). After assembly I hooked it up to my Revox B250 amp and I was rather pleased with how it sounded. This gave me the idea for a Bluetooth speaker project. I got a SANWU SW-HF01 amplifier off a local supplier (can be had from China for less), used WinISD to calculate the optimal speaker enclosure volume. According to WinISD, the response of this enclosure (with these speakers) is flat from 100 Hz upwards, and the -3dB point is at 90 Hz. Then I designed the enclosure to fit on my modded Alfawise U20, added mounting points for the electronics (I removed them on the uploaded model, because the hole pattern was a bit off, since I worked from pictures, as I haven't had the amp PCB yet). Bill of materials: --------------------- - 2x Visaton FRS 8M speakers - SANWU SW-HF01 Bluetooth + amplifier board, but you can use others as well (I'd print a mounting plate for the PCB and superglue it to the rear of the cabinet) - DC barrel socket, with an outer diameter not larger than 8mm - 14x M3x10 screws, I used hex head screws without countersink - 8x M3 nuts - some cables to connect the speakers and the DC socket to the amp - a suitable power supply for the amp board of your choice (I used a 20V 2A PSU from a Fujitsu thin client, which was cheaper to buy than a new PSU) Some comments: ----------------------- - the holes in the rear part of the enclosure are 2.7mm in diameter, they should hold an M3 screw fine. Mine got a bit overextruded, so I used a 2.5mm drill to clean the holes up. Video demo: https://www.youtube.com/watch?v=FIwd0XwPQns