I found an old pair of jbl 2600 bookshelf speakers. I could not find any manuals online. If someone could post a link, or at least the frequency response, I'd appreciate it. Thanks.

A: I know you went on-line, but did you go straight to JBL's support area? Here's the link: http://www.jbl.com/home/product_support/default.aspx?Language=ENG&Country=US&Region=USA. See if you can find your product and download the manual. Good luck.

ok i have a sony reciever that i got with a more expensive sony hitp and i have a pair of older jbl 2500 bookshelf speakers that sounded really good with my old reciever and it had a nice full sound without a subwoofer.
now the jbls have great highs and good midrange but now low end i would think that they would have a fuller sound i dont know why no bass is going to them by the way i have a sonySTR-K675P reciever the speakers which came with my stereo are 6ohm and the jbls are 8ohm...

A: This will make a difference because the 6 Ohms rating is
actually lower wattage power at 8 Ohms so your JBLs are
drawing less power from your receiver. Another item that
you want to consider is that some Sony receivers are not
full range. In other words, instead of running full bandwidth
power (i.e. 20Hz - 20,000Hz), it's more like 40Hz-20,000Hz
and this will greatly hinder the bass performance in a loud-
speaker that can reproduce...

I have a pair of JBL Century L100, and one of them is broken. I would, however like to incorporate the working one into my sound system.
I have to other working bookshelf speakers that sound great, but no subwoofer. So I was wondering if I could turn my JBL into a subwoofer for bass. Or would I have to buy a different cone?
Thanks in advanced..

A: No, you cannot This speaker does not have the frequency response to deliver the inaudible tones a subwoofer is supposed to create. You need to splurge on a new sub.