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Multi-Way Conventional loudspeakers with crossovers

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Old 10th October 2011, 09:54 PM   #1
Tomv is offline Tomv  Israel
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Default Moving from passive to active

I've built a pair of 3-way speakers some years back which I've been very happy with with the exception of the woofer which seems to be lower in spl than the other drivers, my best solution is to get a DCX2496 digital xover and another amp to drive the woofer independently while giving it a higher gain in the xover however I don't know what to eliminate from the mid and woofer parts of the passive xover.
I have included the LEAP schematic + graphs.
I just want to know whats not needed in the passive xover and if needed apart from cutoff points which i know what else to program in the DCX
Attached Images
File Type: jpg schematic.jpg (144.5 KB, 118 views)
File Type: jpg freq resp..jpg (195.2 KB, 117 views)
File Type: jpg freq resp. seperated.jpg (184.8 KB, 113 views)
File Type: jpg impedence.jpg (191.8 KB, 110 views)

Last edited by Tomv; 10th October 2011 at 10:03 PM. Reason: forgot to add it's 3-way(although apparent from the images)
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Old 10th October 2011, 09:57 PM   #2
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I don't use any passive parts when I run active with the CX2310.

BEHRINGER: CX2310
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Old 10th October 2011, 10:01 PM   #3
Tomv is offline Tomv  Israel
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I can't afford another amp and I'm very pleased with the current passive xover apart from the woofer spl which is the only reason I'm doing this, I just don't want the active and passive part to interrupt each other...
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Old 10th October 2011, 10:03 PM   #4
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remove all parts from the woofer xover,
from the mid, at a minimum, the 80uF cap, the 3mH inductor & 2 ohm resistor
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Old 10th October 2011, 10:08 PM   #5
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I dont think you need to change anything on the crossover, just bypass it when connecting the woofer to the amp > DSP. Once connected measure and tweak to ensure you are getting the same crossover point.

I would also recommend MiniDSP over the DCX for what you are trying to achieve - Cheaper, less noise and more flexible.

Edit: Maybe im missing something but as I understand it you want to run the the woofer active and keep the mid and tweeter passive?

Last edited by dabbler; 10th October 2011 at 10:11 PM.
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Old 10th October 2011, 10:09 PM   #6
Tomv is offline Tomv  Israel
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Quote:
Originally Posted by PeteMcK View Post
remove all parts from the woofer xover,
from the mid, at a minimum, the 80uF cap, the 3mH inductor & 2 ohm resistor
and the rest of the mid section is the high filter and notch filter?
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Old 10th October 2011, 10:16 PM   #7
Tomv is offline Tomv  Israel
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yes that's the case but I thought that if I can do it why not bypass the low filter of the mid as well if in case I want to change slope rate or type and for the active part to "interlock" better if you understand what I'm trying to say
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Old 10th October 2011, 10:32 PM   #8
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re:'and the rest of the mid section is the high filter and notch filter? ' - you got it
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Old 11th October 2011, 02:17 PM   #9
Tomv is offline Tomv  Israel
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should I change the polarity of the mid?
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Old 12th October 2011, 01:15 AM   #10
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good question, probably yes, but if you do you'll need to reverse the tweeter too...
it would be easier simply to wire the woofer reverse polarity (try that first, wired both ways?)
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