Need Crossover advice

[Zilch]

Do you mean the woofer still keeps red to red and black to black? But, is it normal when the woofers move negative?

Yes. Keep the woofer and tweeter in phase. Reverse the midrange only.

"The connections shown for the components of a three-way system will result in correct electrical phasing. If the component voice coils, however, are not in the same plane or arc, proper acoustical phasing should be determined experimentally,"

i.e., what Giskard said....

Most vintage JBL systems move negative. The sound reinforcement products have been changed to conform with contemporary AES standards.

Read and weep here:

http://www.jblpro.com/tech-library/J...eN1V12C_v5.pdf

[majick47]

I experienced the same issue as LE15 Thumper with my L200b when I installed 3106 crossovers to run add on 2405 tweeters. The L pad for the LE85 horn was also controlling the output of the 2405 tweeter and I could barely hear it. As suggested I went with "what sounds right". I left the L200b crossover in its original wiring configuration to the LE85 and 136a, running the N200b power wires to the input of the 3106 crossover and I wired only the 2405 tweeter to the HF of the 3106. The resulting sound of the L200b speakers was a 100% improvement and I am able to adjust the LE85 and 2405 independent of each other. Now comparing the modified L200b to my L300 the L200b sounds very respectable. I know it's not by the book but by the book sounded awful and having limited technical ability this worked out very well for me.

[toddalin]

I experienced the same issue as LE15 Thumper with my L200b when I installed 3106 crossovers to run add on 2405 tweeters. The L pad for the LE85 horn was also controlling the output of the 2405 tweeter and I could barely hear it. As suggested I went with "what sounds right". I left the L200b crossover in its original wiring configuration to the LE85 and 136a, running the N200b power wires to the input of the 3106 crossover and I wired only the 2405 tweeter to the HF of the 3106. The resulting sound of the L200b speakers was a 100% improvement and I am able to adjust the LE85 and 2405 independent of each other. Now comparing the modified L200b to my L300 the L200b sounds very respectable. I know it's not by the book but by the book sounded awful and having limited technical ability this worked out very well for me.

Initially, I did this same thing with my N1200/N7000. But on this site I had read horror stories of leaving a speaker tap left "untapped" and how in some cases at some frequencies, this presents a dead short across the amp.

So, I connected it all up as shown in the literature, but put an L-pad across the horn. This way I could run the crossover at "full" to the horn to the benefit of the tweeter, and just reduce the horn volume directly at the horn.

[Zilch]

"Note that the attenuator of the mid-frequency network will vary the acoustic outputs of moth midrange and igh frequency drivers simultaneously."

[Both here, and above, I'm quoting from the 3100A family instruction manual.]

There should be plenty of UHF SPL available using the cascaded connection, and there is an advantage to having the MF and UHF "track," once established, when balancing against the LF.

The 3105/3106 have a LF filter in the midrange leg to prevent the UHF from going to the mid driver. It's important; therwise, both the mid and UHF play the same range, to the extent that the mid is capable of doing so.

Further, Majick47 did not eliminate the stock N200b HF boost circuitry, as I recall, as Toddalin did in his recent new derivative crossover design, also complicating the situation....

[swire1953]

please email back info on where and how to get lx5's and n7000's for my just about perfect sovereign s8r's
[email protected]

[johnaec]

please email back info on where and how to get lx5's and n7000's for my just about perfect sovereign s8r's
[email protected]

Both those crossovers appear fairly regularly on ebay.

John