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In Reply to: OCOS connectors posted by husky2 on April 22, 2007 at 01:35:29:
The OCOS cable is designed to maintain a characteristic impedance close to the speaker's at all frequencies. If the speaker were a true resistive load at all frequencies, this would minimize reflections. However, real speakers have parasitic inductance and deviate substantially from resistive behavior at radio frequencies. Therefore, the cable impedance no longer matches the speaker at frequencies where standing waves can exist on the cable (in the VHF and UHF bands), and the design goal is defeated. A matching network can cure this problem, but a similar network will help any cable, not just the OCOS.The statement on the OCOS site, that the impedance of the cable rises in the bass and that this mismatch affects audio performance, is simply untrue. It reflects an engineering misconception.
You can make matching networks for a few dollars and get all the practical benefit of the OCOS, and more.
Follow Ups:
Very similiar to Jon Risch's excellent speaker cable geometry and to Mogami speaker cable (don't think it's available in the US any longer). Always wanted to try the Mogami cable...never got around to it. As I remember the "highish" capacitance created problems for some amps.
The OCOS has a loaded dielectric. It may be suitably lossy at RF to benefit some amps, but I expect the dielectric would have some sonic colorations.The Mogami would make a good cross-connected cable, as the inner and outer conductors have the same DC resistance. However, this would double the capacitance.
you mentioned matching impedance with a network. would you suggest this network between componets as well as speakers?i am an electronics neophite .... can you explain how one would determine the value of the network that would need to be made and its construction?
In fact AFAIK those cables are specially designed to match Dynaudio speakers. Here in my country they're very recommended for Dynaudios and there're many happy users. They work just OK with Dyns, don't know if with other speakers they're any worth.
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