Upgraded L200A - Actual Impedance of LE15B & New Network For Adding 077 Tweeter
I recently aquired a set of L200As that were upgraded with N8000 networks and 077 slot tweeters
The upgraded L200A speakers include LE15B woofers, LE85 mids, H-91 horns with diffraction grates, 077 slot tweeters, LX-16A networks and N8000 networks.
My first question is what is the actual impedance of the LE15Bs?
The label on the back of the LE15Bs says 6 - 8 ohms?
Some JBL literature including the JBL Technical Manual (L200 / L200A) says that they are 8 ohms?
Other JBL literature says that they are 4 ohms (specs on 2216)?
The DC resistance of my LE15Bs are 3.5 ohms and 3.8 ohms (as specified in the JBL Technical Manual L200 / L200A).
My impedance meter says that at 1K Hz the impedance is 4 ohms?
My second question is what network should I build to improve the sound quality of the L200As and properly add the 077 slot tweeters?
I would like to have the lower crossover point a 800 HZ like the L200Bs.
If the LE15Bs are actually 8 ohms impedance would the 3107 network be suitable.
The original LX-16A and N8000 networks are old and do not sound very good.
t
Not sure you have a 4 ohm driver
DCR of 3.5 ohms to 4 ohms could still be a 8 ohm driver.
Unless someone reconed the drivers and used a different voice coil I think you are safe enough to treat those drivers as 8 ohms.
Just my 2 cents worth of course!
Regards, Ron