This one genuinely doesn't matter so long as you hook them both up the same ends (i.e. if you use writing as red on the amp, make sure the writing wire is hooked up to the red speaker terminal) and remember which way you decided in case you ever have to hook it up again (though to be honest, I'm not 100% sure if this is necessary, I just do it to be safe). In this situation, I usually go for the one with writing on as positive (red) - don't know why, just makes sense in my head!