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Old 5th July 2013, 12:32 AM   #111
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Try adding a pole to the woofer filter. I find second order parallel for both drivers with reverse polarity on the full range works best for me. But I've never actually wired up a series XO, just modelled them.
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Old 5th July 2013, 12:42 AM   #112
satx is offline satx  United States
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Pole? Do you mean a cap? With second order parallel I can get the phase fine and okay with second order series. I just started trying to model series crossovers; very weird.

I just wanted to try the 1st order series for less/cheaper parts. I can get the response pretty decent just not phase, much better than the 1st parallel (FR not phase).
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Old 5th July 2013, 03:04 AM   #113
gassit is offline gassit  Australia
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Thank you!
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Old 5th July 2013, 04:38 AM   #114
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Keep a careful eye on impedance and your transfer functions when doing series.
Yes by adding a pole I meant a cap. Make it second order.
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Old 5th July 2013, 05:22 AM   #115
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Quote:
Originally Posted by tuxedocivic View Post
Keep a careful eye on impedance and your transfer functions when doing series.
Yes by adding a pole I meant a cap. Make it second order.
The impedance is hovering above 6 ohms and the transfer function shows an impedance spike, but it doesn't show in the driver response.

The phase is very odd for the full range driver below the crossover frequency. Wavy or loopy
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Old 5th July 2013, 05:23 AM   #116
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Sorry the full range shows a spike in the transfer function at FS, but it doesn't show in the driver response
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Old 5th July 2013, 05:30 AM   #117
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Adding a cap causes a knee in the woofer response in the breakup region where with first order it has a nice smooth roll-off of about 10db/octave. The phase does come together, but only for a small bit below the xo.
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Old 5th July 2013, 05:37 AM   #118
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This is just playing around, but why does the full range (Red) and it's phase look so weird below the crossover. Is that right?
Attached Images
File Type: gif Rs100-08 transfer function.gif (31.1 KB, 59 views)
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Old 5th July 2013, 05:21 PM   #119
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That's because of the impedance peaks in the full ranger I'm assuming.

If you get a peak in the woofer response due to the cap, you need to make the cap smaller. Try something like 5mH and 50uF on the woofer. And 30uF and 3mH on the full range with reverse polarity.

Is that image a series cross over? It looks like it. My above suggestion is for parallel, but about those values should work for series also.
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Old 5th July 2013, 05:30 PM   #120
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Yes, that is 1st order series.

I don't get those peaks with parallel, only series. I have no problem getting a nice response, phase and driver rolloff with parallel 2nd, I just wanted to see what could be accomplished with 1st order series. Maybe these drivers aren't so good for it.
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