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sideways 28th October 2012 11:59 AM

Need help with a xover please...
3 Attachment(s)

I would like to make a passive xover for my Visaton KE25SC tweeter and my Morel HU621 drivers...

I've measured them in the box (15L ported tuned to Fs of the Morel) and the graphs are below...specs for the Morel too...not much needed for the Visaton I'm guessing...8 ohm...Rdc 5.9 ohms...89db...

Any help would be appreciated!!


system7 28th October 2012 12:20 PM

The Visaton tweeter has built in LCR correction of Fs resonance, whic is handy.

The Morel looks pretty smooth.

I wonder if you fancy a serial crossover? Reckoned to be good with the right drivers:

Your woofer must be quite similar to the Morel CAW 638 though I'd download the specs for comparison. You can check Zobel values here:
Impedance Equalization (L-Pad) Circuit Designer / Calculator

xjr100 28th October 2012 12:34 PM


Originally Posted by sideways (
I've measured them in the box...

Can you export your drivers measurements in some format (txt ?)

sideways 28th October 2012 12:38 PM

Hey Steve

Yes...both drivers are very smooth...which I why I wanted to take a crack at a passive :)

So...are you saying just a network for the Morel and leave the tweeter alone??

system7 28th October 2012 12:50 PM

No, what I'm suggesting is you can omit the LCR circuit on the tweeter in the crossover. It's built into the tweeter. :)

You might sim this circuit in Boxsim with a 0.6mH W130S 8 ohm woofer. It should be electrically similar even if the efficiency and exact frequency and phase response is different.

See how it looks. :cool:

sideways 28th October 2012 01:05 PM

1 Attachment(s)
K...just plugged in those drivers...came out with this for a 15L ported box...


And...isn't this still a parallel network??

system7 28th October 2012 01:28 PM

I just ran it up the flagpole on a serial crossover. It doesn't work because the tweeter is too flat on frequency response to the Fs resonance so you get too much driver overlap and a midrange peak. :mad:

Back to the drawing board. For a standmounter with bafflestep correction on a parallel crossover, it's gonna be about 1 to 2 mH slope coil as you are thinking. :)

sideways 28th October 2012 01:37 PM

So...if I go with that xover in the pic, it would be a good start??

What about just a first order?? Seems like the drivers would be a natural for that!!

system7 28th October 2012 02:07 PM

2 Attachment(s)
I was just looking at this 6" morel HU 621 driver. How do they get the low rolloff? :confused:

Morel Loudspeakers - Raw Drivers - Woofers

Last time I saw a frequency response like that, it was an 8" or 10" SEAS Excel and Exotic woofer! :D

Yes, low order could be the order of the day. You could give it a bash with just a coil I reckon. Will mull this over and remind myself what SEAS did with the X2-08 W8 Exotic.

Ah, here it is:

Uploaded with

sideways 28th October 2012 02:29 PM

Well...that was the DEQX measurement in the box that I am using...

The Visaton is good down to 1.5k - 1.8k...would like to use somewhere in there for a xover point...

They both seem to be natural together which is why I wanted to try a passive for giggles :D

First order seems like it could work!!

I mean there are lots of speakers that use the internal workings of the driver for their natural rolloff point and a cap for the tweeter...Reference 3a comes to mind!!

The Morel runs a bit too high though for that...therefore a first order maybe?? 10uF cap and a .47mH coil??

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