Originally Posted by brockwilt
1. How much of an issue is the recone/surround kit?
2. Do the foam surrounds on the woofers wear out often? Should I be hesitant buy speakers from the early 90's. Can you still get parts for them.
3. What should I look for when buying a used pair of l5's l7's. What questions should i ask about their condition.
4. I'm also concerned about powering them. I have an onkyo 876 that does 140 watts per channel 8 ohms and the l5's are 6 ohm speakers. You can bridge the onkyo 876 for 200 watts per channel but they recommend for 8 ohm speakers only when bridging. How well would the onkyo 876 handle the l5's or l7's. I can't really afford an amp right now or I would just do that
5. Can you mix 6ohm and 8 ohm speakers. Because the l1's are 8 ohm and the l5's and l7's are 6 ohms
6. Is the lc2 a bad match for the l1 l5 and l7's
7. Could I use an l1 as a center channel or is that not a good idea
That's a lot of questions; so many, in fact, you ran out of question marks!
You'll get lots of answers no doubt. Here's mine.
1. There is no replacement surround available and no recone kits were ever made, except for the 12" woofer in the L7. JBL's recommended practice from Day 1 was to replace the entire driver.
2. They don't wear out as much as they separate from the cone and/or develop a fatigue crack right at the join. The surround is perfect except where it fails. Some folks have used latex to seal/heal the break, and it appears to work, but I don't know for how long. If done from the rear, it's not too unsightly, but I suspect it changes the speaker's performance and characteristics slightly. How much I don't know.
3. Look at each driver closely, and if possible check for breaks in the surround near the attachment to the cone. Also check for voice coil rubbing. Have the seller play them if possible. If you hear a whizz or a buzz, you'll likely need a new driver or two. Lots of used drivers in good condition are available on ebay. These drivers last a long time, so if they're in good shape and you take care of them, you're good to go. "Taking care" means not being stupid.
4. 140 genuine Watts will be enough; if it's 140W at 1000 Hz with one channel driven, then it's not 140 W. I wouldn't bridge the Onkyo even for an 8 Ohm load; it's not really robust enough.
5. Yes you can. In fact speaker loads are an average number put out by the manufacturer, so an 8 Ohm speaker and a 6 Ohm speaker might vary from 2 Ohms to 10 Ohm across their entire frequency range. The L1 and L3 will have resistance dips and peaks that are at points quite similar to the L5 and L7 dips and peaks. Don't worry about it.
6. The LC2 is not a bad match. It's not a good match. It might be an okay match. For the L Series there is no good match for a center, not even the similar looking CL505 (though lots are in use that way), except for...
7. Using an L1 or L3 as a center, which is an ideal match if it fits into your layout.