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why would you want to know what the real world means? Seriously though if you are going to do some testing/analysis, I'd be very curious to see your results. I've definitely not seen this particular situation discussed in any formal setting so I'd be curious to see what you find out.

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DJ Tony
Let It Rip Karaoke

Real world are my ears I'll test how it sounds using the sub's crossover only which is at 125 hz and will test with my DBX 223XL at the same 125 hz to see which gives me the best results Now that's a big scientific test

Hey while we're on the topic of internal vs. external Crossovers. I bought an external crossover sometime ago with the intent to use it as more of a splitter than a crossover. However I have yet to use it.

I have EV Eliminator i Subs and PeaVey 215's. The 215's cabs have their own internal crossover. While the EV say's its Crossover is an Acoustic/electronic filter (is that tech talk for a Low Pass Filter?) Anyway, neither product spec sheet gives me any crossover frequencies. I'm assuming that the EV allows 100Hz and down since its spec sheet says its Frequency Response is 40-100 Hz. The PeaVey gives me a frequency range of 40Hz - 21KHz.

Now, with all that said, and reading the discussions on internal vs. external crossovers, I'm no longer sure whether I should use one, and just rely on what each speaker provides internally. My perceived problem is that if I don't use the crossover to send the mixer main signal to both my subs and the PeyVeys, what do I sue as an alternative?

Write or wrong, If I don’t hear anything to the contrary on this by tomorrow I plan to set the Crossover for 100Hz and below for my subs and 100Hz and above for the PeaVeys for a my daughter’s High School choral show tomorrow evening.

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EveningStar Entertainment & Events
JR & Michele LaPorte
Peoria, AZ

That's what I would do if I were you, but let's see what the experts have to say

Difference here is the EV sub is not powered nor has it's own crossover if i'm looking at the correct model. In this case I would still use the external crossover. The sub actually recommends a crossover point of 40-50 hz, although I believe i would still put it about 80-100 hz to begin with. Sometimes you do have to play with the settings.
The scenerio where an external Xover was not recommended was on a powered sub that already has an electronic crossover built in.

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And this is exactly the point I was trying to make that Jeff seems to be missing. Ultimately, it's about what you hear. Funny how this job and that of even an audio engineer, all comes back to using your ears. All this other techno mumbo jumbo you see me, jeff and others rattling off on this forum are nothing more than hints, proven methods, etc to get you close to finding the sound you want. So again, I'd be interested in hearing about your results from your comparisson.

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DJ Tony
Let It Rip Karaoke

OK, here's my test result but first let me describe the equipment used:

Audigy2 ZS pc card
Mackie 1402-VLZ Pro
Crown XTi 2000
EV ZX1
DBX-223XL
KV2 Audio - KX 1.2

http://www.kxaudio.com/products.asp?ProdID=KX1.2

Tested in my finished basement which has a dimension of 15 x 30

I first started playing some Michael Buble using the DBX set at approx 120hz which is the crossover point on the sub, I had no DSP enable on the Crown and all levels set to 0db except the output level of course . Music sounded great, bass was heavy but tight and well controlled, my tops were smooth and clear. Now, I connected the mixer directly to the sub and used the high pass output of the sub to connect to the Crown using my Mogami cables. I started playing back the same Buble tracks and I was surprised to hear my sub sounding much louder than when using the DBX, in fact it was at least 25% louder but sounded boomy and with out that tight controlled bass I had with the DBX I had to adjust the rotary level on the sub to -6db to minimized that excess bass. As for the tops, the sound was incredibly smooth, rich and a little pushed back due to that sub wanting to take all the space.

In conclusion, I find more benefit on using an external crossover assuming you are using good cables. The external crossover will let you cross point at a lower frequency and will let you adjust the levels. I wouldn't want to see myself run a show where I couldn't adjust my sub level, that excess uncontrolled bass isn't something I would want to deal with in a live situation.

Like I said, not a scientific test but enough to convinced me on the importance of using an external crossover.

Cool Micky, thanks for sharing!!

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DJ Tony
Let It Rip Karaoke