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Multi-Way Conventional loudspeakers with crossovers

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Old 9th November 2017, 01:00 PM   #51
Lojzek is offline Lojzek  Croatia
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Started working on a filter, while doing it I thought to ask if you have any passive parts at hand so I can work out a version that you may be able to play as soon as you assemble it. Any caps in the 10 uF vicinity; inductors 1.5-2.0 mH; 0.3 mH, some resistors 2.2-4.7 R ?
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File Type: png Filter.png (10.7 KB, 35 views)
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Last edited by Lojzek; 9th November 2017 at 01:24 PM. Reason: Added schematic
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Old 9th November 2017, 10:06 PM   #52
Old'n'Cranky is offline Old'n'Cranky  Australia
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Thank you Lojzek

Yes I have more than a few spare parts lying around.
So I can build whatever is described without any issues

Oh and i have an lcr meter so i can also rewind any inductor to whatever is required.
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Old 10th November 2017, 01:07 AM   #53
Old'n'Cranky is offline Old'n'Cranky  Australia
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I have that xover in place on one speaker.

I've swapped the tweeter resistor from 3.3 to 4.7.
Listening it was a little too bright on axis.

Measures close to ruler flat though.
I'm guessing the dip at 1.1k is baffle interaction ?

Screen shot of sweep with 3.3 / 4.7 / reversed tweeter.

Time to listen and see what their like now.

EDIT, I have no zobel in their at present, only what Lojzek has simmed.......
Attached Images
File Type: jpg System xover 1 - 4.7 gate.jpg (204.0 KB, 32 views)
File Type: jpg System xover 1 3.3 + 4.7 + Reversed.jpg (221.0 KB, 31 views)
Attached Files
File Type: txt System xover 1 3.3.txt (14.2 KB, 0 views)
File Type: txt System xover 1 4.7.txt (14.2 KB, 1 views)
File Type: txt System xover 1 4.7 Twtr Reversed.txt (14.2 KB, 1 views)

Last edited by Old'n'Cranky; 10th November 2017 at 01:31 AM.
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Old 10th November 2017, 08:14 AM   #54
Lojzek is offline Lojzek  Croatia
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Good, you keep up listening to it and we will see after some time how this goes. Zobel you don't need and it would just make spl before XO point to take a dive. We can try a second version of a filter with a 3 kHz XO point, and then you will decide what may suit better. The 1 kHz resonance is a normal thing with these units and often is linked to being caused by cone surround measures.
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Old 10th November 2017, 10:31 AM   #55
Old'n'Cranky is offline Old'n'Cranky  Australia
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Yes I kinda thought the zobel wasn't needed in this design.
Otherwise you would've shown it

I now have both sides running.
Sounds pretty good to me.
I mean ok I can pick faults, but I'm used to my speakers that are just that weee bit more expensive
Main fault (if I can use that term) is the quality of the treble, but I guarantee thats due to the odd mix of caps I'm using for the tweeter at present.

The owner is visiting sometime this weekend to give his verdict.

For the inductors, obviously I should aim for lowest dcr on the bass series 1.8mh.
But is there any guide as to what dcr I should aim for with the tweeter shunt 0.3mh ?
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Old 10th November 2017, 12:49 PM   #56
Lojzek is offline Lojzek  Croatia
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I have assumed the woofer inductor to be about 0.5, and the tweeter around 0.3. These values are not critical. I'll post the 3 kHz XO version in case this loudspeaker is going to be driven hard and I would want its tweeter to survive in any case.


edit: 2nd schematic, 1.8 mH(dcr 0.5); 0.82 mH(dcr 0.3); 0.2 mH (dcr 0.2)
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File Type: png 3 kHz XO point version.png (11.0 KB, 20 views)
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Last edited by Lojzek; 10th November 2017 at 01:06 PM.
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Old 10th November 2017, 11:50 PM   #57
Old'n'Cranky is offline Old'n'Cranky  Australia
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Thank you.

Now, what software are you using for all this ?
Time for me to start learning.
Ha, when I have time that is
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Old 11th November 2017, 07:39 AM   #58
Lojzek is offline Lojzek  Croatia
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You are welcome. I am using Bill's "XSim" for quick creation of non-standard filters although Bagby's "PCD" is faster to come up with a solution if the schematic that it is able to simulate will do the job. They are all doing the same thing, crunching numbers.
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