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Multi-Way Conventional loudspeakers with crossovers

Xover reverse engineering
Xover reverse engineering
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Old 21st September 2019, 11:50 AM   #1
ziocalepino is offline ziocalepino  Italy
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Default Xover reverse engineering

Hi is it possible to know electrical parameters of xover starting from pictures?
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Old 21st September 2019, 01:13 PM   #2
AllenB is offline AllenB  Australia
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Sure, but some information will take even more work first. What parameters are you trying to find out?
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Old 21st September 2019, 01:53 PM   #3
Pano is offline Pano  United States
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Xover reverse engineering
Since you know the values, you could just trace out the connections and make a schematics. You might make a few mistakes, but just post it here for review and corrections.
Once that's know, it could go into a crossover simulator like XSim.
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Old 21st September 2019, 02:27 PM   #4
ziocalepino is offline ziocalepino  Italy
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Frequency of xover and tweeter attenuation ad first. Then more than possible
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Old 21st September 2019, 02:36 PM   #5
mbrennwa is offline mbrennwa  Switzerland
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Xover reverse engineering
You need to know the drivers impedance curves, and possibly also heir SPL curves.
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Old 21st September 2019, 02:41 PM   #6
Pano is offline Pano  United States
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Xover reverse engineering
True for best results. But knowing the values and schematic of the crossover will at least show you something close to the filter factor the designer was attempting to achieve.
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Old 21st September 2019, 02:47 PM   #7
AllenB is offline AllenB  Australia
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Maybe just tracing the tweeter half would be enough to get close to the crossover frequency and attenuation.
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Old 21st September 2019, 03:52 PM   #8
bentoronto is offline bentoronto  Canada
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Xover reverse engineering
Let's get serous here. Since you can plainly see the crossover, you can plainly see it has problematic parts like electrolytic capacitors and iron core inductors.

Even if you wanted to use such parts, even if you were OK with the complexity of the XO, and even if you can read their values off the labels, are you able to determine if the replacement parts you buy are close to their values and match L and R?

Clearly there's some low freq crossing over here. Today, many of us would handle a woofer or sub by bi-amping.

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Old 21st September 2019, 06:49 PM   #9
mbrennwa is offline mbrennwa  Switzerland
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Xover reverse engineering
Quote:
Originally Posted by bentoronto View Post
Let's get serous here. Since you can plainly see the crossover, you can plainly see it has problematic parts like electrolytic capacitors and iron core inductors.


Nothing wrong with those parts if they are used in the right way.
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Old 22nd September 2019, 01:14 AM   #10
AllenB is offline AllenB  Australia
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I even use electrolytics in series with my tweeters from time to time
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