|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
151.197.35.149
I am building some PA speakers for vocal monitoring in a rehearsal studio. I obtained the plans for these from the B&C Speakers web site. They show a schematic for the passive crossover between the 12" mid bass and HF horn.(Link Below) They do not however provide voltage or wattage values on the components.I have kinda figured out on my own that the capacitors should be film and have a rating of at least 250v and the inductors should be either 16 or 14 gauge wire. The circuit shows a 15ohm resistor. Anybody have any idea as to what type and how many watts this should be? Also, directly above the resistor is a capacitor whose value is hard to read. It looks to me to be 0.12uF, but I found another site that someone had made it legable with a value of 0.82uF. Does this sound right? If it is 0.82uF, that's a bit hard to find even if paralling several together, but I will work on that some more. Any help would be greatly appreciated.
- http://www.bcspeakers.com/index.php?sez=3&categoria=45&id_descrizione=105&prodotto=106&id_descrizione_prod=61 (Open in New Window)
Follow Ups:
The picture is illegible. You are right in using 250v polys. For coils 14 ga wire is fine, just as important is whether to use air or bar core, go with bar if it's necessary to keep DCR at .5 ohms or less. The resistor should be a 20 watt wirewound, there are some made specificaly for crossover use. I can't imagine either a .82 or .12 uf cap in a crossover network.
I had no trouble getting a readable print, just click on the small image. You might email Ralph Nichols at B&C's U.S. office about specific types of components(if Kwatson is in North America, otherwise, check the B&C website for the appropriate distributor).
In high power crossovers, Bill has mentioned appropriate types of components. One point about differences between iron core and air core coils is the iron core types are probably needed in the low pass sections, as they generally have higher power ratings available along with keeping DCR readings low with the higher inductances found in low pass sections. I would try an air core inductor in the high pass section, along with the 260v poly caps(Solen are one example).
Possible sources:
www.madisound.com
www.partsexpress.com
www.solen.caBest regards,
Thanks for the quick reply Bill.
This post is made possible by the generous support of people like you and our sponsors: