Hi Guys. I fixed the loose wire that made one horn stop working from my last post here. Gaining access to that mid range horn compression driver was/is a lot of fun. You have to remove around 12 large machine screws, and then a second inner wooden access panel that is a bear to remove easily. It really fits in there very snugly. These L300 cabinets were very well made honestly. I have had to do this 3 times now. Each time I move the speakers that same compression driver wire gets loosened on that one driver. These speakers were last owned by the original bass player for the 1970's rock group "Duke and the Drivers." He told he bought them from the original owner around 1980. I basically agreed to buy them sight unseen knowing nothing much about them except for posting a question first on AA. I then rented a big truck with a rear ramp to load them easier with my bad back using my 2-wheeler and rope only. I drove a few hundred miles round trip to snag them. Amazingly almost 5 years ago now they were for sale for $500 for many weeks in the local WantAdvertiser before I found the ad for them. He told me that everyone calling him about them was only willing to offer him $100 to 250 cash for them. I told him on the phone I would be very happy to pay him his $500 asking price for the pair sight unseen which I did. At that time I was not working so $500 was a lot of money to me. He told me that he really wanted them to go to someone who would enjoy using them more than for the highest price. I mentioned that I owned vacuum tube amps and he said they will sing with as little as a 10 wpc tube amplifier. That deal turned out to be very lucky for me at that point in time. But ever since I owned them I have always had to adjust the L-R speaker balance of my preamplifier(s), or receivers a lot to favor one speaker to equalize the sound from these L300 speakers. I have owned them for almost 5 years now. They sound very good when the balance is adjusted and the horn is working.. But now I am setting up my very first home theater setup using them for my two front speakers. I will be using my pair of L100T3 for the rear and the new higher end L series center channel speaker. I have just bought a nice used working JBL bass bin also. How can I overcome the problem with the L300 sound, or speaker imbalance? I have used multiple tube amps and a large solid state receivers also and still one of my L300 speakers plays a lot louder than the other one.
I do not want to chop up the original crossovers. I would rather buy a new pair of crossovers. Does anyone sell crossovers that will work with my L300 speakers? I do not want to go through biamplification (or with these tri-amplify them) again. I have another pair of the 4875c4(8) like the ones in the link below. The only difference is I am using tad td-4001 2" compression drivers in the 2360A horns. These speakers were cobbled together over time for my Dad who is profoundly hard of hearing. With these 6' tall horn speakers he could for the very first time since WW2 hear a femal singers voice. Seeing him smile listening to his classical music was worth every penney that I spent on the parts separately to build them. I have them biamplified just like they were designed to be. I am using a Marchand xm-121 vacuum tube active speaker crossover using Welborne 45, and Welborne 300b mono blocks to power them. They are the nicest sounding speakers we have ever heard with no horn shout at all. The 31" x 31" JBL 2360A biradial horns are simply amazing. I have also driven them with a passive crossover using only the 1.7 wpc 45 mono blocks and the bass was very fast, full, and it went pretty darn low to my ears. http://www.jblpro.com/pub/cinema/4675c_48.pdf
So with my L300 can anyone point me towards someone who sells a set of crossovers for my speakers? I am going to power my home theater with a Butler model 5150 "sand (solid state) and triode" hybrid amplifier at 150 wpc into 5.1 channels. I am using a Fosgate FAP-V1 vacuum tube dolby 5.1 sound processor/preamplifier. I do not want to go with another Marchand 3-way active crossover for my L300 speakers to make my system even more complicated than it will be now to set up properly. I would rather buy new L300 crossovers and keep the original ones intact in my L300 speakers. Can anyone here able to point me in the right direction for new speaker crossovers? If anyone knows someone I can pay who can build me a pair of crossovers, or a kit I can assemble that would be sweet also. I wanted to use larger rear speakers but the room is not all that big for our home theater. Until my problems are worked out I am only using my L300 alone with the volume balance adjusted to favor the one side for now. Shipping these 140 pound monsters out would be a killer. I would much rather buy new crossovers for them than ship the whole speakers for repairs. I would have to have them crated and strapped onto pallets to ship them out. That would get very ugly and painful for my fused and laminated spine. Thanks a lot folks for reading this. I did find the article on rebuilding L300 speakers on the web. It seems the original crossovers in these L300 Summit speakers are not so very easy to open up I read. So simply replacing them sounds like a far better option for me right now at least. John C. - Framingham, MA