View Full Version : No Inductors in L88 Plus Xover?
supertech
01-02-2010, 10:22 PM
Please pardon my limited knowledge of crossovers, but why are there no inductive coils in an L88 Plus (N88) crossover shematic?
LE15-Thumper
01-02-2010, 10:41 PM
The woofer was probably ran full range, therefore, no xover components there at all.
Mid and tweet used a cap in series to set low cut off point and were ran flat out to the top of the spectrum.
I haven't seen an L88 schem in a while, so I am going on memory.
HTH
Uncle Paul
01-02-2010, 10:45 PM
Looks like your memory is pretty good: http://manuals.harman.com/JBL/HOM/Technical%20Sheet/L88%20Plus%20ts.pdf
Zilch
01-03-2010, 12:12 AM
Sometimes you feel like an inductor:
L88 had one (in the highpass):
http://manuals.harman.com/JBL/HOM/Technical%20Sheet/L88%20Nova%20ts.pdf
Plus don't.
Once upon a time, L100 had them, too:
http://manuals.harman.com/JBL/HOM/Technical%20Sheet/L100%20CENTURY%20ts.pdf
What's that have to do with anything...? ;)
supertech
01-03-2010, 08:44 AM
Thanks for the input, gentlemen.
I am taking my L88Ps (2 pair) to the next level. I have an M12 expander kit for one (they are difficult to locate). The N120 crossover module in the M12 only adds a 10285 8 ohm L Pad and a 3 microfarad cap. I have spare 10285s. I believe I can make this modification with little trouble. 104H-2s in place of the LE5-2.
Whatta ya think?
Rusnzha
01-03-2010, 02:30 PM
I built charge coupled crossovers for my L100s and swapped out the LE 5-2s with 104H-2 mids. Got em hooked up to an old Mac 1900. Due to the 123A-3 woofers, they still sound like L100s, but a lot better. This is a bedroom system. I don't always sleep too good. When these are playing, this never seems to be a problem.
Zilch
01-03-2010, 02:54 PM
Whatta ya think?I think there is a better option:
http://www.audioheritage.org/vbulletin/showthread.php?p=123070#post123070
Two there, actually.... :yes:
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