I bought these speakers as cheap monitors and they are exactly that. The sound is quite bass heavy so don't expect bright audio. they do go quite loud but probably not loud enough for a party.
The speakers are ok for listening to CDs on or streaming videos but don't expect to be able to mix professionally on these things. I personally use them as every day use speakers for computer games, very rough mixes etc.
The price is ok but I think with hindsight I wouldn't choose these. I think I'd probably save the money for a decent set of monitors. These speakers are good if you're testing tracks or sounds on them which you don't dare put through your expensive monitors in case they get damaged.
Also, and most importantly for me the first set I had were faulty which wasn't thomann's fault. there was an electrical fault on one of the speakers and it had constant noise coming out of it. the replacement pair I greceived are better but they pick up hard drive noise from my PC which is bizarre as they are plugged into an audio device, not directly into my PC. I tried different types of cables but nothing worked. I have to turn the volume dial on the side to a position with the least noise on the speakers. However, if I plug an ipod directly into them there is not noise at all. It seems like these speakers have issues when connected to a computer.
To summarise these JBLs are moderately priced, average speakers which are quite bassy and pick up electrical noise from a PC.