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Old 28th October 2012, 12:59 PM   #1
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Default Need help with a xover please...

Hello

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!!

Thanks!!
Attached Images
File Type: jpg Visaton Small Box.jpg (488.1 KB, 237 views)
File Type: jpg Morel Small Box.jpg (462.1 KB, 229 views)
File Type: jpg HU621 Specs.jpg (179.2 KB, 220 views)

Last edited by sideways; 28th October 2012 at 01:18 PM.
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Old 28th October 2012, 01:20 PM   #2
system7 is offline system7  United Kingdom
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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:
Sreten & Speakerman go at series XOs

Click the image to open in full size.

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
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Old 28th October 2012, 01:34 PM   #3
xjr100 is offline xjr100  Europe
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Quote:
Originally Posted by sideways View Post
I've measured them in the box...
Can you export your drivers measurements in some format (txt ?)
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Old 28th October 2012, 01:38 PM   #4
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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??
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Old 28th October 2012, 01:50 PM   #5
system7 is offline system7  United Kingdom
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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.
http://www.visaton.com/en/literature...ads/index.html

See how it looks.
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Old 28th October 2012, 02:05 PM   #6
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K...just plugged in those drivers...came out with this for a 15L ported box...

??

And...isn't this still a parallel network??
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File Type: jpg Passive xover 1.jpg (448.8 KB, 200 views)
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Old 28th October 2012, 02:28 PM   #7
system7 is offline system7  United Kingdom
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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.

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.
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Old 28th October 2012, 02:37 PM   #8
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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!!

Last edited by sideways; 28th October 2012 at 02:40 PM.
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Old 28th October 2012, 03:07 PM   #9
system7 is offline system7  United Kingdom
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I was just looking at this 6" morel HU 621 driver. How do they get the low rolloff?

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!

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.
X2-08 EXOTIC W8

Ah, here it is:
Click the image to open in full size.

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File Type: jpg Morel_HU_621_frequency_Response.JPG (45.6 KB, 24 views)
File Type: jpg Morel_CAW_638_Frequency_Response.JPG (52.6 KB, 25 views)
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Last edited by system7; 28th October 2012 at 03:16 PM. Reason: Added SEAS crossover
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Old 28th October 2012, 03:29 PM   #10
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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

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??

Last edited by sideways; 28th October 2012 at 03:35 PM.
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