No. You're not trying to do any impedance matching when connecting a sub. It is also a low frequency signal, so most of the specs that make coax good or bad don't matter. Most use RG-6 or RG-59. These just happen to be 75 Ohm, but 64 Ohm is fine. And, as you said, it works.
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Belden 8761 - suitable as sub cable?
The shop where I bought my sub from threw in a length of Belden 8761 as the sub cable. I've used it and it works fine. But one thing is when I checked the specs the 8761 is rated at 64 ohm impedance. I thought usually sub signal cables are 75 ohm. So is there anything the matter with the 8761 at 64 ohms?
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