This may be what you’re looking for but do confirm the size.

https://www.ebay.com/itm/2pcs-For-JBL-1-...

I’m not sure if theyd be the same diameter but in general I would suggest searching ebay for “15W full range” and looking to find one with the same measurements that you might be able to fit in there. Might want to change em as a set.

Main thing to watch out for is that you seal the speakers up against the case well. Perhaps some glue of some sorts may be of help.

someone above noticed that there was some buzzing caused by a mispositioned magnet. May be worth checking out.

There seems to be minimal to no heatsinking for the processor, compared to other devices with a similar chip.

The thermal engineering looks pretty bad when compared to Samsung's recent products or a lot of other devices.... I wonder whether it throttles.

The mystery component looks more like an antenna to me than an inductor....

Unfortunately I don't have this thing anymore, but if you look up the official specs, then go by the proportions on-screen, you can probably get a decent idea.

Perhaps open it up and then use a multimeter or some other speakers to see if you're getting any output from the amplifier? Sometimes the speaker drivers are damaged by dropping.

It looks to me like the heat is mostly going to the battery... I wonder why they couldn't have added at least a heatsink to the second heatpipe so it at least does something?

It would seem like this design would cause the battery to heat up considerably, which I can't imagine being too good for it. Considering how how these things get, it would appear that this would only cause the battery to have a shorter lifetime and make a difficult replacement come sooner.