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If you have seperate Subs Mids and Tops You need a 3 way crossover.

!5 years of experience, and you ask this.

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I can neither confirm nor deny ever having or knowing anything about nothing.... mrscott

Well are they internally crossed over or not?

If they are, why do you need an external crossover too?

Yes they are crossed over internally for their own cabinet.  The sub probably has it own high cut off point as well.  When running them together, unless you get the crossover point between the sub & you top cabs just right, the top cabs are going to be trying to reproduce what the sub is supposed to be taking care of.  Also if the sub isn't at the correct point, it could be trying to reproduce frequencies that the tops are supposed to be handling.  An external crossover will take care of this PLUS give the added benefit of being able to control the balance between the subs & the tops - which is what you asked for in the first place.

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Well not necessarily a 3 way would be necessary.  His tops are already crossedover internally.  An external 2 way would be all that is needed.  Crossover point approx 80-120hz, everything below that point goes to the sub, everything above goes to the tops & are divided internally to separate the mid & high.

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Internally crossed over to be used as stand alone units.  Add a sub - even one with a built in crossover, then the whole system can gain much benefit froman external unit.

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I had a another thought on this topic. Keep in mind my speakers were all made by the same company and designed to work with each other. As a matter of fact it even states in the manuals that no cross over is required. I know there seems to be a concern of balancing the tops and the bottoms for audio level from the mixer. So that got me thinking about the technique known as "Auxiliary fed subs" so of course, seeing how I seldom sleep anyway, I went down and reconfigured the gear to  accommodate, it really didn't take long. I fired everything up and ran a few tests. Well in deed it works beautifully and an added benefit is that as the Aux used for subs is only carrying low frequencies so it can be dialed in for that purpose. Anyway, just another thought on the subject. It's the old "if theirs a will, theirs a way" thing. I had heard and read about the practice quite awhile ago, but I've been running through a driverack so I had never give it much thought. Has anyone else ever tried this?

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Quickness of mind will deceive the eye

I assume by that you take a post-fader aux and set it to some level for each channel, and use that to feed the subs. Subs almost being mono by nature....and you may run mono anyway.


That means you need an EQ channel for it. I wouldn't save a rack space in that case -- or would I? No, I wouldn't, because I use an EQ channel to eq the FX feed and roll off the low frequencies, and so my EQ is full even though I run mono.