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Multi-Way Conventional loudspeakers with crossovers

Mission 751 Crossover Circuit Diagram
Mission 751 Crossover Circuit Diagram
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Old 27th December 2016, 06:35 AM   #11
dewdrop is offline dewdrop  Singapore
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Originally Posted by Freddypipsqueek View Post
I've replaced the caps and tweeter resisters and added some supertweeters with very good results. Has anybody upgarde the bass units in the 751/53 and if so with what units. the bass is a a litte light. Thanks.
Revisiting an old thread here.

Freddy, are your speakers the 751? I can't see the capacitor values on the crossover. Can you please share?
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Old 9th June 2017, 06:14 PM   #12
ThetaII is offline ThetaII  United Kingdom
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Bump.. (on behalf of Dewdrop and myself)

Had a look at mine and it appears to have a 1uF cap in parallel with the resistor which I don't understand - unless I'm reading it wrongly. I would be great if somebody with a bit more electronic knowledge could explain.

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Old 9th June 2017, 07:52 PM   #13
Lojzek is offline Lojzek  Croatia
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One would want to see a clear shot of the XO board with values of the caps and resistors stated.
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Old 9th June 2017, 08:47 PM   #14
ThetaII is offline ThetaII  United Kingdom
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Photobucket

Thats a link from the previous poster (Freddypipsqueek on page 1). I can tell you on the other side of the cap it says 1MFD which I assume means 1uF? ..I couldn't see any other ref to capacitance on it.
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Old 9th June 2017, 10:31 PM   #15
Dissi is offline Dissi  Switzerland
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The white component labelled 3.3K/100V isn't a resistor, it's a 3.3 uF film capacitor. Together with the 1 uF electrolytic wired in parallel, the total tweeter capacitor (?) seems to be 4.3 uF.
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Old 10th June 2017, 07:35 AM   #16
Lojzek is offline Lojzek  Croatia
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Found this photo online.
Attached Images
File Type: jpg Mission 751.jpg (27.5 KB, 97 views)
File Type: jpg Mission 751 sch.jpg (62.3 KB, 97 views)
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Old 10th June 2017, 08:48 AM   #17
ThetaII is offline ThetaII  United Kingdom
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Many thanks to Dissi and Lojzek - that helps a lot and makes sense to me now, and will help anyone coming across this post in the future.
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Old 10th June 2017, 09:20 AM   #18
dewdrop is offline dewdrop  Singapore
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Originally Posted by ThetaII View Post
Many thanks to Dissi and Lojzek - that helps a lot and makes sense to me now, and will help anyone coming across this post in the future.
Thanks guys!

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Old 10th June 2017, 09:21 AM   #19
dewdrop is offline dewdrop  Singapore
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Originally Posted by Dissi View Post
The white component labelled 3.3K/100V isn't a resistor, it's a 3.3 uF film capacitor. Together with the 1 uF electrolytic wired in parallel, the total tweeter capacitor (?) seems to be 4.3 uF.
The interesting point is why did they use a film and electrolytic combination?

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Old 10th June 2017, 09:59 AM   #20
ThetaII is offline ThetaII  United Kingdom
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Good question dewdrop ... that had crossed my mind .
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