Yuyue Bluetooth speaker (compatible with 3-inch + 1.25-inch tweeter, 2.5-inch Super Xiao Ai Pro full-range, Wang Xiaochen 9.1, 8.5W amplifier)

Recently, I wanted to tinker with some audio systems and became interested in disassembling a Super Xiaoai Speaker PRO, but its original enclosure was a bit ugly, so I only bought the disassembled speaker drivers, 2.5-inch dual magnetic steel for only 12.4 yuan each. I made a DIY Bluetooth charging speaker

After getting it, it felt quite heavy and had strong magnetism. Initially, I wanted to make a speaker with a bass reflex port, but I felt that a small enclosure wouldn't work well. However, having spent so much time modeling, it would be a shame to waste it, so I switched to a passive radiator design. The passive radiator is made of TPU, with wave creases around it, forming an irregularly shaped wing diaphragm. Personally, I think it looks a bit like a small fish, so I named it the 'Fish Leap Speaker'. I hope it brings you joy

Currently, the speaker's front panel is adapted for the Wang Xiaochen 2*9.1W Bluetooth amplifier (21.2 yuan). This slot is also compatible with their 2*8.5W amplifier (9.9 yuan). Mine is a visually appealing speaker, so using a cheaper amplifier saves more money

Assembly steps:

1. Insert the Wang Xiaochen Bluetooth amplifier into the front small board. The exposed hole positions for 9.1W and 8.5W are consistent. Note that the fixing screw positions are different. As shown in the figure, apply some foam at the front position to prevent air leakage

2. Carefully insert the disassembled Super Xiaoai Speaker PRO driver from the side. It should fit snugly into the rounded rectangle behind the front panel, and secure the driver with M2.5x6 screws

3. Insert the front small board into the rectangular slot. Connect and secure the lithium battery to the amplifier. Mine is a 21700 battery, so it's placed at an angle. If it's an 18650 battery, multiple cells can be laid horizontally in parallel

4. After confirming the speaker wiring is correct, cover both sides with the TPU passive radiator, press it down with a rigid frame, and secure it with M2x6 or longer screws

(There's also an older diaphragm with multiple small circular folds, you can download the original design file to view it)

6. A 60mm passive radiator can be attached to the back (a dozen yuan for ten pieces on Pinduoduo), or a printed TPU diaphragm can be used, and secure the back cover with M2 screws

The side TPU diaphragm can optionally be fitted with a hardening cover, to complete the assembly

July 24 Update

Seeing the price increase of the Super Xiaoai Pro speaker drivers, it's better to get 3-inch drivers directly for twenty-something yuan, so I redesigned a two-way speaker model with better sound quality