Those look in pretty good shape and perhaps check the crossover and recap them. Sony’s speakers are okay but not top notch. They might make for speakers for a bedroom system.

If the grilles and/or back are removable, the drivers can be swapped and an appropriate crossover installed to replace the originals.

You can look around on ebay for other great matching components as Yamaha most likely made matching turntables, tape decks and CD players for this system, but other newer components of other brands might have styling that can closely resemble the styling of this Yamaha.

LOL, those would been worthy of a sledgehammer :-)

Yorx is just as bad as those two.

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I know most package systems sold thru stores can be rather mediocre to junk., but this package the OP was gifted is quite decent stuff.

There’s a variety of equalizer setup apps in the app stores that will sure help in adjusting the equalizer for the room acoustics and the speakers you have so that you can get great sound even with a set of “not so hot” speakers.

Perhaps get a turntable (if you have records) or a CD player in addition (if you have CDs). There are also bluetooth adapters you can get to connect to the inputs to allow you to pair and play a music app (Spotify, Sirius, Pandora, etc) from your favorite smartphone through the system.

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Pair it up to a decent pair of speakers if you don’t have any yet.