Originally Posted by noah katz
I guess it's safe, but I don't see how you reached it.
In the Nominal Speaker Impedance section of this link, http://www.roger-russell.com/wire/wire.htm
, it described the natural variance of impedance relative to a given frequency."When the impedance rises higher than the nominal value, this is not a problem for a power amplifier. However, some systems may deviate significantly below the rated impedance and this could be a problem for a power amplifier, particularly where matching output transformers are concerned."
and just above that in the Wire Table section, there is a chart that gives a wire size relative to the impedance of a given speaker."For example: you can use#18 wire for a 25 foot run to a nominal 8 ohm speaker, but if the run is increased to 35 feet, #16 wire must be used. (**) 50 feet is the maximum recommended length for normal line cord or Romex solid copper wire. This length is more than adequate for most installations. An explanation is further down on this page titled "What about Wires Longer Than 50 Feet?".
A wire resistance of less than 5% of the nominal speaker impedance is chosen to work well with almost all speaker systems and can be considered conservative. Even a resistance of less than 10% of the nominal value could be used with some speakers and would not be audible. A further explanation can be found in a later section."
For my room, I have exceeded the ratio for my surrounds. I am using 16ga wire and the runs from the receiver are ~60ft. The speakers on my deck out back are even further away and only use 18ga. According to this chart, I am using undersized wire for the distance and impedance. I could get away with 20ga for my mains in their current location, but the receiver may have to move to a distance requiring ~25ft or longer requiring 18ga wire.
I kept reading, actually read it twice, and there was input from Ian Masters in the An Honest Answer from Sound & Vision (2001) section further toward the bottom of the link."Cheap Wire
Q. Would it be okay for me to use single conductor wire as speaker cables running through the attic or under the house? Does stranded wire provide some sonic benefit? It would be far cheaper and easier for me to run 12-gauge wire to a plate with banana receptacles and then use specialty cable at each end to patch to the amplifier and speakers. Jon Schwendig, Santa Clara, CA
A. There are a lot of myths about speaker wires, but in the end it's thickness that counts, and 12 gauge should be heavy enough for any reasonable domestic application. I've taken several comparative listening sessions over the years, and the sort of wire you want to use involves no sonic degradation that I (or anybody else in the tests) could hear. You could even wire the whole distance from amp to speakers using 12-gauge, but it would probably be more convenient to use something more flexible for the actual connection to components. Specialty audiophile cables would serve that purpose nicely, although more modest cables would work just as well."
The reason behind my conclusion is that in the event my lengths change and/or I move to a speaker with a lower impedance profile I will be covered. I will be stepping up and replacing the wire that goes to my rears and the deck speakers as I can.
Is my logic here not sound? I am all for alternate points of view here. I am not bothered by being corrected either. Edited by filtor1 - 6/28/13 at 1:56pm