Doc Mark
04-12-2015, 03:50 PM
Greetings, Friends,
Probably 20 years ago, I bought a spare 2405 from a friend of mine, for $90. When I picked it up, I ran a signal through it, at very low volume, just to make sure it wasn't dead. I noted that the back JBL 2405 plate had gone missing, and that someone had used a magic marker to write a few things on tape on the back of the magnet housing. Since then, I sort of forgot about that, until the other day, when checking to make sure it was ready for the upcoming 4-way system. It appears that in July of 1991, someone changed out the diaphragm on this 2405 with a new one for a 2402/075. After doing a bit of research here on the forum, I'm confused a bit. Some strong information here states that the JBL part number for both the 2405 and the 2402, is the same number. But, others have suggested that this may not work. I'm leaning towards what was in the Transducer information here on LH, and somewhat discounting those who expressed doubts about how this would work. I'm I on the right track? The note on the back of my old 2405 reads: "New Dia. 2402/075, 7/91". Back in '91, was the part number the same for both the 2405 and 2402 diaphragms , as it appears to be now?
I guess the proof will somewhat be in the pudding, when I finally get everything hooked up and running. But, I'd really like to know if what I've read about the part numbers for both 'phragms being the same. Thanks for any comments and info you can send my way. Take care, and God Bless!
Every Good Wish,
Doc
Probably 20 years ago, I bought a spare 2405 from a friend of mine, for $90. When I picked it up, I ran a signal through it, at very low volume, just to make sure it wasn't dead. I noted that the back JBL 2405 plate had gone missing, and that someone had used a magic marker to write a few things on tape on the back of the magnet housing. Since then, I sort of forgot about that, until the other day, when checking to make sure it was ready for the upcoming 4-way system. It appears that in July of 1991, someone changed out the diaphragm on this 2405 with a new one for a 2402/075. After doing a bit of research here on the forum, I'm confused a bit. Some strong information here states that the JBL part number for both the 2405 and the 2402, is the same number. But, others have suggested that this may not work. I'm leaning towards what was in the Transducer information here on LH, and somewhat discounting those who expressed doubts about how this would work. I'm I on the right track? The note on the back of my old 2405 reads: "New Dia. 2402/075, 7/91". Back in '91, was the part number the same for both the 2405 and 2402 diaphragms , as it appears to be now?
I guess the proof will somewhat be in the pudding, when I finally get everything hooked up and running. But, I'd really like to know if what I've read about the part numbers for both 'phragms being the same. Thanks for any comments and info you can send my way. Take care, and God Bless!
Every Good Wish,
Doc