OK, I have been investigating suppliers and part availabilty to rebuild xovers on my SRS's. I am also still anxiously awaiting tso more of the silks!
But I am not an electrical engineer and am curious.
First, I opened the box and examined the crossover closely. I noted the position, size, and part numbers on all the caps. I have:
2 TSI 8531 130mfd 75VPAC +/-20%
2 TSI 8539 20mfd 50VPAC +/-10%
1 TSI 8533 92mfd 75VPAC +/-10%
1 TI 4.4mfd J 100V
1 TI 12mfd J 100V
There is also a small brown relay/thermistor type part in the middle of the board which I am unsure of.
Does the voltage make a difference? As long as I get a cap rated at the particular voltage or higher am I then alright?
Are these items polar? Do I have to hook them up +/- in some direction?
If I can't get a 130, can I parallel/serial say, a 50 and an 80 to add up to 130? Or should I strive to get a 130 even if it is of slightly lower quality?
These tolerance percentages seem quite loose to me. Is there a huge benefit to get much higher tolerance caps? 5%? Mil Spec?
Are the polyfilms truly that much better? Or would electrolytics with tighter specs be as good?
Is it, in general, better to stick with one supplier? Do they work better together if they are the same supplier? Or is it OK to mix and match?
I was asounded to see some of the prices. One site had some poly caps on sale, and the larger value ones were upwards of 100 bux each. Are these folks making these by hand? If there was a way to make them, I'd give it a try, except for the fact that it would be hard to control the capacitance and tolerances.
Any body have any ideas?