In Reply to: Tube friendly JBL's posted by Wayne Parham on December 04, 2002 at 23:28:11:
as in the JBL 4648a-8 systems have a response notch around 820 Hz. that is shown on the jbl data sheets. The same "notch" is also shown on their 4638 system data, using a pair of 2035H's. Can't cheat physics.JBL network schematics for dual woofer systems often use a LP inductor value of about twice the "upper" woofer one for the "lower" woofer, "to promote a smoother response" in the xover region. You might try running the upper woofer "fullrange" or pseudo-1st up to 1.6kHz., and "choke" the lower woofer around 800Hz. Sam
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