I don't have a real preference as to the length of either, but more towards the connection being made at each end. Interestingly, Maple Shade strongly recommends the opposite, i.e. long speaker cable (no less than 8'), and short interconnects. I would think that both should be as short as possible, but not too short! Heh, heh, you ought to see me try and make something reach when there is a safer choice at hand.
When I think about it though, the interconnects are trying to send a 1-2 volt signal on to the next in line, whereas the speaker cables don't have that same issue coming right out of a power amp.
When I think about it though, the interconnects are trying to send a 1-2 volt signal on to the next in line, whereas the speaker cables don't have that same issue coming right out of a power amp.