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You shouldn't worry about the "quality" of wire if you have good RCA cables (they run about $30 or so for 20ft) with gold plated plugs and shielding. Monster cable has good cables and speaker wires. You can run RCA cables about 50 ft before you'll start to get signal loss, and if you want to run it more than that, I'd use XLR before you go with optical--that is unless you have about $200 or more to spend on optical. 3 meters of audio grade fiber will run you about $45 or more and if you want longer than that you'll probably have to go to a high end audio store (like ovation if you have that around you, or the listening post may be able to point you in the right direction) and get it made for you. Fiber will be very expensive, and you'll have to take great care not to bend the fiber very much otherwise you will get signal loss. The resistance of light traveling through the fiber is very low, but with the internal reflection, you actually can't run fiber that long without a signal booster of some sort. That is why they don't sell fiber in lengths longer than 3 meters anyway, aside from the cost. You can probably get signal boosters, but I have no clue how they would work with fiber, where you can find them or how much they cost.
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cables and wire...
