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This topic comprises 2 pages: 1 2
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Author
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Topic: JBL Loudspeakers - Bi-Amp Questions
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 05-21-2002 10:55 AM
I have a set of JBL 4675C speakers (built-in crossover network) and I'm wondering if it would be better to use the built-in crossover, or use the one in the processor and then bi-amp.I prefer the whole idea of bi-amping but I'm wondering if this is a case where it wouldn't be a good idea. What about the 4670D? It's essentially the same speaker with a smaller horn. ------------------
~Manny. Now...where was I ?
Leonard Shelby, MEMENTO.
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 05-26-2002 11:43 AM
Thanks for all the help. I really appreciate the info and the tips.One more question about the 4670D and the 4675C... They both have a built-in crossover network (4638-TH)...Is it necessary (or advisable) to bypass the JBL crossover since I'm using the Dolby circuitry to separate HF and LF? My fear is that removing the crossover from the speaker cabinet would change its acoustical properties. But...at the same time...Do I really want a signal that's already been "filtered" to pass through another "filter" ? Right now, I'm feeding the LF signal to the speaker via its built-in crossover...nothing connected to the HF output of the network. The HF is getting its signal directly from its corresponding amplifier. Just reading through their catalog...JBL doesn't seem to recommend these speakers for bi-amping...they're pushing the 4675-8LF instead. These 4670D's and 4675C's are the speakers that are already in these auditoria and the owner isn't interested in upgrading them at this time (and besides, they're good speakers, right?). ------------------
~Manny. Some people can read "War and Peace" and come away thinking it's a simple adventure story while I, on the other hand, can read the ingredients on a chewing gum wrapper and unlock the secrets of the universe.
Lex Luthor, "Superman: The Movie"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 05-26-2002 08:20 PM
>>"cubit size of the room"<<Cubit? Whats a cubit? ... RIGHT! Steve ------------------
"Old projectionists never die, they just changeover!"
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Ray Derrick
Master Film Handler
Posts: 310
From: Sydney, Australia
Registered: Sep 2001
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posted 05-30-2002 05:49 AM
John, are we talking Royal Cubits here (20.5 Pyramid Inches) or garden variety cubits?Richard, how many cubits does it take to change a light bulb?....ah never mind. Manny, you should bypass the built-in crossover in your JBLs completely if you are bi-amping the system, otherwise you will end up with a nasty hole around the crossover frequency. ------------------
Ray Derrick
President/Chief Engineer
Panalogic Corporation Sydney, Australia
Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 05-30-2002 10:12 AM
Ray, that's what I was curious about.Any suggestions on how to do that without leaving a big square hole in the side of the LF cabinet (where the xover is now) ?
Wouldn't such a hole change the acoustic properties of the LF module ?
Does anybody sell a speaker terminal the same size ? ------------------
~Manny. Some people can read "War and Peace" and come away thinking it's a simple adventure story while I, on the other hand, can read the ingredients on a chewing gum wrapper and unlock the secrets of the universe.
Lex Luthor, "Superman: The Movie"
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