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Multi-Way Conventional loudspeakers with crossovers

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Old 30th March 2013, 11:41 AM   #1
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Default Help with speakerfilter

Hallo all,
I bought 2 speaker emty speaker cabinets with fiters in. I want to buy new speakers but I do not know the frequency range and the filterlow-mid-high pass frequency.
All formula's I found did not give the component parts they used in this filter.
Can somebody tell me the crossover points of this filter?
Thanks in advance.
Regards.
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Old 30th March 2013, 11:44 AM   #2
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Default DIY

Speaker Crossover Calculators by V-Cap
DIY
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Old 30th March 2013, 11:48 AM   #3
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Hallo QSerraTico_Tico,
I can only give impedance and frequency in this, it calculates then the values of the parts.
My problem is that I know the values but I do not know the frequency.
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Old 30th March 2013, 01:50 PM   #4
Dissi is offline Dissi  Switzerland
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A simulation with random drivers and cabinet:

SimulationMississippi.jpg

CrossoverMississippi.jpg
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Old 30th March 2013, 02:08 PM   #5
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Quote:
Originally Posted by mississippi View Post
Hallo QSerraTico_Tico,
I can only give impedance and frequency in this, it calculates then the values of the parts.
My problem is that I know the values but I do not know the frequency.
Just try!!
Most probably it's Butterworth.
Try with different frequencies till you get a match with the values of your parts.
I miss the DC blocking caps on the mids.

Last edited by QSerraTico_Tico; 30th March 2013 at 02:11 PM.
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Old 30th March 2013, 05:56 PM   #6
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Dissi,
Thank you very much for this.
This is what I was looking for.
When I change some components, can I ask you again for new data ?
Regards.
M
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Old 31st March 2013, 03:28 PM   #7
Dissi is offline Dissi  Switzerland
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Hi Mississippi,

Your crossover has two mysteries. As QSerraTico_Tico already mentioned, there is no serial capacitor in the midrange section and the midrange driver runs unfiltered at low frequencies. That only makes sense in a 2.5-way system. So the question is: Are woofer and midrange of the same size and do they share the same volume in the cabinet or is the midrange driver smaller and in a separate little housing?

The second mystery is the gap between 1 and 1.5 kHz. Either the original midrange had a rising frequency response and filled the gap or the original tweeter did. However a crossover frequency of 1.5 kHz is too low for most of the dome tweeters, perhaps it was originally a closed cone tweeter.

Please give us some more information. What are the dimensions of the cabinet and what is the driver size? Is it a vented loudspeaker? A picture and brand and model would help very much.
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Old 31st March 2013, 06:29 PM   #8
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The cabinets are 54 * 65 * 53 cm (h * b * d). Both vented.
The low cabinet has the low filter and the speakerhole is 15".
The mid-high cabinet has also 1 speakerhole of 15".
So the mid-high speaker is 1 thing that has 2 speakers in 1 construction.
I think it looks link LEM K6 low ? mid/high systems.

Last edited by mississippi; 31st March 2013 at 06:31 PM.
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Old 1st April 2013, 05:12 PM   #9
Dissi is offline Dissi  Switzerland
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Ok, then it's a PA speaker consiting of two equal cabinets of approximately 120 litres. One cabinet holds a 15" professional woofer and the other one a 15" coaxial driver. If the cutout holes are actually 15", then the drivers have to be even larger!

I'm not really familiar with this kind of speakers and can not recommend something. The drivers are expensive and it will be difficult to find the ones working best in your setup. However, if you propose some drivers, I offer to check the results, provided manufacturer data are sufficient to make a rough simulation.

Pro audio Europe Audio
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Old 2nd April 2013, 07:20 AM   #10
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Are the tweeter speakers in place? Are they in series or parallel?

I would do changes to the crossover. If the tweeters are in parallel, you can make them parallel, I would remove the 140 uF, put the 3.9 uF where the 36 uF is, put the 6.8 uF where the 3.9 uF was and put the 36 uF where the 6.8 uF was. This is in case the tweeters are non-piezo that can go down to 1k Hz.
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