JBL L-300 Summit Are they still any good?

@iconicaudio,
You might want to check out the Lansing HERITAGE site you will get more info on all things, JBL and ALTEC. Yes, they are good. Mike

http://www.audioheritage.org/vbulletin/showthread.php?28611-JBL-4435-by-Guido=

Lansing Heritage has a wealth of knowledge. I am just so busy listening I haven’t had time to even go on the site. I bought these at an estate sale from the original owner. I am not quite sure how common consecutive serial numbers are with the L 300 but these are consecutive serial numbered.All the drivers and components inside are very close in serial number.
The cabinets are in pristine condition not a mark on them. 

I clean my JBL very often. may be you have to do that toohttps://ludokingmodapk.xyz/