Got your messages, replying here as the private message 'conversation' is closed for some reason. Yes, they look like decent good quality full-range bookshelf speakers. If you're good at replacing surrounds by all means replace them. Otherwise just look around for another pair of bookshelf speakers with decent 8" drivers and you'll probably be fine. You can reconnect them for now if you want, because they should disconnect automatically when you plug in external speakers.
Now, if you would like to upgrade them BETTER than the originals, and buy American, try Item #223670729502 on the 'bay, those will bring the house down, super hi-quality...:o)
Let me know if there's anything else - Cheers! Bellarmine