Do you mean inches (") or feet (')?? As Dbw and Jostler say, timing is not an issue. Try figuring out how long it would take a signal to travel 14 feet at say half the speed of light.
But the load seen by each side of your amplifier may differ if the lengths are too disparate. I'm not an engineer but I came away from a long explanation given to me at a show by a well known designer of very popular cables concluding that anything closer than 2:1 is probably ok, and 1.5:1 is definetely safe. So I wouldnt go with 14 ft and 4 ft. Id make the shorter one longer, say 10 feet at least. And then, if you're going to go that far, why not make them the same length so you can sell them if you need/want to. As Abstract says, unequal length cables are hard to sell.
There are several cable makers who say different lengths are fine. And one high volume dealer in Nordosts once told me that neither he nor any of his well-eared (and heeled) customers could tell the difference in sound between a one meter and a five meter length of Blue Heaven speaker cable paired with 5 meters on the other side.
But the load seen by each side of your amplifier may differ if the lengths are too disparate. I'm not an engineer but I came away from a long explanation given to me at a show by a well known designer of very popular cables concluding that anything closer than 2:1 is probably ok, and 1.5:1 is definetely safe. So I wouldnt go with 14 ft and 4 ft. Id make the shorter one longer, say 10 feet at least. And then, if you're going to go that far, why not make them the same length so you can sell them if you need/want to. As Abstract says, unequal length cables are hard to sell.
There are several cable makers who say different lengths are fine. And one high volume dealer in Nordosts once told me that neither he nor any of his well-eared (and heeled) customers could tell the difference in sound between a one meter and a five meter length of Blue Heaven speaker cable paired with 5 meters on the other side.