This is a custom speaker box that was use for the Sony Mega Bass Tape Boom Box to take the speakers out and put them in a new encloser/speaker box.
This is what boom box I got the speakers from: https://www.ebay.com/itm/405831273060
Here are the parts besides the speakers:
¼" Jack: https://www.amazon.com/dp/B01BW3SPKK?ref=ppx_yo2ov_dt_b_fed_asin_title
2mm screws for the speakers.
Speaker wire to solder and wire the jack to the speaker. I only used TS parts of the jack and not the whole TRS. I cut the 3rd prong off on the jacks.
The author marked this model as their own original creation.