I chose a PC speaker MS-77 manufactured by Elecom for this project. It is separated in left and right channels and the amplifier was built into the right one. To built the MP3 player into the case, open the case and remove the amplifier. The rear panel was fixed in ultrasonic welding. I drilled some holes to the rear panel, and pulled and remove it. The internals are held by only rear panel and there was nothing to fix inside the case so that I bonded four studs to the corners to fix a rear panel (Photo
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