Need help with crossover

[EYEdROP0]

Hello all. I just got some Velodyne DF-661 and I am very happy with them. I heard you can place a 10uF polypropylene capacitor in parallel over the electrolytic in the crossover and greatly increase the dynamics. What does this mean and how do I go about doing this? Is this the part Im looking for?:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=027-428

Thanks.

 

[Haoleb]

Just a guess but I think what you may be supposed to do is simply replace the electrolytic with something such as the dayton. If you were just going to put it parallel with the existing electrolytic capacitor I dont know why you woudlnt just replace it all together. It doesnt make any sense to me to parallel one capacitor with another.

 

[EYEdROP0]

Thats what confuses me. Anyone?

 

[Swerd]

I just got some Velodyne DF-661 and I am very happy with them. I heard you can place a 10uF polypropylene capacitor in parallel over the electrolytic in the crossover and greatly increase the dynamics. What does this mean and how do I go about doing this? Is this the part Im looking for?:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=027-428

Yes, that part is a 10 µF polypropylene cap, but what you should do with it is not clear. If two caps are wired in parallel to each other, they act as one larger cap whose value is the sum of the two smaller caps. If you add 10 µF to an existing cap in a crossover, you will change the filter, perhaps significantly. I don't recommend doing that.

Before doing anything, you need to find a schematic diagram or a good photo of the crossover in your speakers. What is the value of that cap? It should be printed on its side.

If that cap is an electrolytic cap, and if it is more than 20 years old, it might have dried out enough to be out of spec. If so, you could replace it with another cap of the same value.

But if, as you said above, that you are "very happy" with your new speakers maybe you shouldn't fix what isn't broken .

 

[EYEdROP0]

Ok, so I called Velodyne and talked to some of the guys that were actually part of the design team of the DF-661. He said he hired an acoustic technician to design a better crossover with higher quality parts, but it would cost Velodyne too much to build it on a large scale, so they never went through with it. He said he would send me a diagram of the modified crossover and more imformation about the speakers.