14G-])utch^
Active Member
Nice work. Could you give us some sort of detailed review? And primarily whether you prefer the JBL sound or the Murphy sound? Or are they just different?
Thanks
Jon
Thanks
Jon
If you go to the original Audioholics thread http://forums.audioholics.com/forums/threads/the-vintage-jbl-west-coast-sound-becomes-the….25014/ you can read several listener's impressions. All of them greatly prefer the new revised crossover over the original.Nice work. Could you give us some sort of detailed review? And primarily whether you prefer the JBL sound or the Murphy sound? Or are they just different?
What's weird is the midrange interaction with the woofer. I don't know what you call it, but we all know the sound a pair of out-of-phase speakers make. That weird sound like it's coming from behind you, or inside your head, it's kind of hard to describe. I've been to peoples houses (who should know better) and told them one of their speakers is wired back to front.
I'm not Leesonic, but I was involved with the redesign of the L-100 crossover that Dennis Murphy did. The work was done with my speakers, and I wrote the original description of the new crossovers: https://forums.audioholics.com/forums/threads/the-vintage-jbl-west-coast-sound-becomes-the….25014/.Hi, I own a pair of L100, and have the same feeling of you! the sound (great sound) sometimes seems to came from behind, like out-of-phase.
What if i try to invert the midrange's wires? Could I cause serious issue? I honestly don't think so, but I would like to hear your opinion.
JBL's schematic of the L-100A showed the mid driver with opposite polarity to the woofer and tweeter. Those wiring polarities were probably based on their acoustic performance as judged by listening, trial and error style. As you said, these 'crossovers' had only high-pass filters without any low pass filters at all. A single cap does introduce some phase delay. But it doesn't resemble what we see now where there are high-pass and low-pass filters to cover all driver hand offs.In the original XO, the tweeter and the mid both had just a single cap on them, making both a 6db per octave slope. How is the mid the only driver out of phase with the woofer?
JBL's schematic of the L-100A showed the mid driver with opposite polarity to the woofer and tweeter. Those wiring polarities were probably based on their acoustic performance as judged by listening, trial and error style. As you said, these 'crossovers' had only high-pass filters without any low pass filters at all. A single cap does introduce some phase delay. But it doesn't resemble what we see now where there are high-pass and low-pass filters to cover all driver hand offs.
I wasn't present when JBL designed those crossovers, so I can only guess .