Firstly please forgive my ignorance. Ive just bought my first piece of gear, a Marantz 2230. Im working with a budget of pennies. I just need to get up and running.. Ive found a pair of JBL J2050 bookcase speakers at goodwill, 15.00 dollars. Will these give me acceptable sound?. I don't know the terminology, but one of the domes is pushed in, not torn, just pushed in,can I just pull this out with a vacuum? Lastly is there a text some where on speaker restoration? Again please forgive my lack of knowlege, thanks George.