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BiAmping JBL 4367 Speakers

I was considering running a tube amp on the horn portion of the JBL and keeping a solid state amp on the woofer section. My Trinov preamp has a fully adjustable electronic crossover, so I could set a crossover point for 700 Hz for the amps. 

 

The question is would it hurt to use the external binding posts to each driver section of the speakers and leave the passive crossovers in place. I suppose I could eventually bridge the connections in the passive crossover and go directly to the drivers, but this is just a trial to see how things work. 

Any significant problems with doing it this way?

neonknight
ohlala
1,276 posts
 

You may want to look in to the M2, the "pro" version of 4367 that is made for use with a DSP crossover.  I do not know what is to be gained by using an active crossover with a passive crossover. I assume gain can be easily adjusted though the Trinnov, though. 

neonknight OP
532 posts
 

Well let us say we want to run these speakers with tube amplification then. What ends up being an appropriate amplifier? Can Quicksilver monos in the 100 watt range do it? 

ohlala
1,276 posts
 

I tried a VAC 170iq, a KT88 x 4/ 85 watt per channel amp with my 4367s. That amp could not control the woofers. This resulted in forward mids and highs and recessed bass. I replaced it with a 532H, which fixed that problem.  

Post removed 
deep_333
2,442 posts
 

Pro JBLs and other pro speakers can give you an button/knob option to completely bypass an internal passive crossover. But, the 4367 probably doesn’t...So...(very easy to do, however)

- Unhook the wires running from the passive crossover to the individual drivers, but, feel free to leave the passive crossover inside the cabinet.

- Unhook the jumpers running from one set of binding posts to the other at the back of the speaker cabinet.

- Run wires directly from one set of binding posts to the compression driver.

- Run wires directly from another set of binding posts to the woofer.

Everything else should go smooth with the active crossover inside the Trinnov --> 2 different amps ---> 2 sets of binding posts (one going directly to the comp. driver and the other to the woofer).

 

The learning curve would be some of the fine tuning inside the Trinnov for crossover, filter type, delays and levels...

The compression driver is most probably more sensitive than the woofer...So, you’ll probably need to drop the level on it a bit inside your trinnov. You could either use a 24db/oct Linkwitz Riley setpoint or....try to blend like a 18db/oct butterworth filter hpf<-->lpf over a broader range between 700 to 900 hz perhaps, not sure what are all the crossover filter options you have inside the trinnov. To my ears, the latter type of blend tends to sound better.

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