JBLPRO
03-03-2016, 10:08 PM
Hello All,
Its been about 8 months since I completed my JBL 4355 clones. They are 99% perfect! The veneer trimming was a real challenge! I decided to build a CC version of the crossover as per Giskard and Timbers design. All the driver polarities are wired per JBl spec. Today I performed a polarity check on the entire system using the BSS AR-130 phase checker set. Very nice and very accurate piece of equipment. I used the sender signal via input of my preamp. Here are the results: 2235's -(negative) 2202's -(negative) 2441's -(negative) 2405 +(positive) I am not sure what the final polarity should be of all the drivers? All the SAME polarity or some 180 out of phase? I'm pretty sure at 10,000 hz( 2441-2405 x-over point) I will not be hearing this phase reversal but just wanted to know how they were originally setup and designed. BTW this speakers do sound very dynamic and have a beautiful soundstage!
NOTE: the 2405's are the Alnico versions. I am almost certain they have the original JBL diaphragms in them.
Thanks,
Mike Kehr
Its been about 8 months since I completed my JBL 4355 clones. They are 99% perfect! The veneer trimming was a real challenge! I decided to build a CC version of the crossover as per Giskard and Timbers design. All the driver polarities are wired per JBl spec. Today I performed a polarity check on the entire system using the BSS AR-130 phase checker set. Very nice and very accurate piece of equipment. I used the sender signal via input of my preamp. Here are the results: 2235's -(negative) 2202's -(negative) 2441's -(negative) 2405 +(positive) I am not sure what the final polarity should be of all the drivers? All the SAME polarity or some 180 out of phase? I'm pretty sure at 10,000 hz( 2441-2405 x-over point) I will not be hearing this phase reversal but just wanted to know how they were originally setup and designed. BTW this speakers do sound very dynamic and have a beautiful soundstage!
NOTE: the 2405's are the Alnico versions. I am almost certain they have the original JBL diaphragms in them.
Thanks,
Mike Kehr