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Old 22nd May 2012, 01:36 PM   #1
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Default Caps in x-overs

A friend asked a question which I do not know the answer to, maybe someone here could help.
He has many Type X2 capacitors lying around and he wants to know if they could be used in an x-over. They are MKP (polyprop) and MKT (polyester) dielectric types. Is there a difference in a "normal" polyprop and a polyprop Type X2 typically used for mains suppression and filtering?
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Old 22nd May 2012, 02:07 PM   #2
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Yes, usually MKP are better and more expensive, used for high frequencies.
MKT are more used for lower frequencies or in parallel circuit with drivers, not as important duties and as replacements for old electrolytic caps. But you should adress each cap in special and it's characteristics relating with hi-fi.
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Old 22nd May 2012, 02:55 PM   #3
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Hi Inductor, thanks for reply.
Maybe I put my question badly, but my question is not polyprop vs polyester. It is: Can Type X2 capacitors be used in an x-over or are there other influences the Type X2 construction might have on audio. Type X2 caps which are design for mains applications are packaged to be high voltage safe and fire resistant etc. Is there maybe "snubbing" effects that will prevent high frequencies from getting through the high pass filter? Is the Dissipation Factor as good as 'n "normal polyprop?
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Old 22nd May 2012, 03:11 PM   #4
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"Type X2 capacitors" meaning a crossing (line) capacitor tested to 2500V (...didn't know).
X1 (impulse tested to 4000 Volts), X2 (tested to 2500 V), Y1 (tested to 8000 V) and Y2 (tested to 5000 V).
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Old 23rd May 2012, 12:02 AM   #5
AllenB is offline AllenB  Australia
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They can be used, but there's no guarantee you'll find them an improvement on what you have.
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Old 23rd May 2012, 12:15 AM   #6
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Quote:
Originally Posted by valvesound View Post
many... capacitors lying around and he wants to know if they could be used in an x-over.
I would not lose my time with used ones, probably if they are "shot" and out of spec. If new I certainly would compare them with standards (or best caps from the list) and would improve with matched pairs.
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Old 23rd May 2012, 02:13 AM   #7
DavidL is offline DavidL  United States
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Just replacing caps with other types without measuring the values is going to make the sound different. Some people consider this as "better" I just call it modifying the frequency response unknowingly.
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Old 23rd May 2012, 06:28 AM   #8
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Thanks guys for the replies.
These are unused caps which he has and he has measured them to make up a parallel bank to produce a value required for the filter. It is a new x-over for a new pair of speakers he built.
So the question is, is it worth the effort or are these Type X caps inferior?
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Old 23rd May 2012, 06:35 AM   #9
AllenB is offline AllenB  Australia
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I subjectively formed the opinion some time ago that I wasn't going to mess with them any more, but YMMV.
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Old 23rd May 2012, 06:40 AM   #10
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Hi AllenB, sorry but what does YMMV mean?
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