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Pioneer CS-A700 Speaker low power

zenarrrow

zenarrrow

Well-Known Member
I have a pair of Pioneer CS-A700 speakers. One of them seems to have like only a quarter of the power as the other one. I have changed everything around and isolated the problem to the speaker. Should I do a recap on this? Is that what could be the problem?
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The cap sizes are as follows.
The big one is 25V-50uf
then
2, 50V-10uf
1, 25V-2uf
1, 25V-20uf
 

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First check the drivers, especially the woofers. Measure their impedance and compare. If not sure you may swap drivers from one speaker to the other, thus verifying for sure that drivers are OK. Clean the switches with deoxit. Recap is advisable even if those capacitors look good - they are very old and dry by now. 2 uF replace with polypropylene such as Solen. 10 uF replace with some mylar 100 V, or if budget allows, with polypropylene. Solen are one of the cheapest. 50 uF you can get a bipolar 100 V or, better, use a film capacitor for as much capacitance as you can afford, and the rest of the value parallel with bipolar. E.G. 20 + 30 +/_ 2. One of your better sources for speaker capacitors is partsexpress. Partsconnexion, Michael Percy, and Handmade electronics carry them, too. For mylars check the bay. No need to say, you must do both speakers, if you choose to recap.
 
Will these work below for the recap?

1-50uF 100V Non-Polarized Capacitor
Part Number: 027-354
1-Dayton Audio DMPC-2.0 2.0uF 250V Polypropylene Capacitor
Part Number: 027-414
2-Dayton Audio DMPC-10 10uF 250V Polypropylene Capacitor
Part Number: 027-428
1-Dayton Audio DMPC-20 20uF 250V Polypropylene Capacitor
Part Number: 027-436
 
Yes, they will. But be carefull, polypropylenes are big, so plan ahead how you gonna place them on the board. The description has measurements, so that helps. Especially the 20 uF. Try to keep capacitors close to the board - leads reasonably short. Use hot glue to keep them in place.
 
Do you have any other suggestions for 20uF 250V Polypropylene Capacitor
Part Number: 027-436? Something smaller in physical size.
 
The caps can "stand off" the crossover board if need be or you can even extend the wires on them and glue the cap off to the side if so desired. It's not going to hurt anything.
 
Mylar (polyester) or bipolar electrolyte. If you find the value +/_ 2 uF - might be ok, such as 22 uF. Or you can use electro and bypass it with a small polyprop (2 uF) for a total value of 20.
 
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