sorry I wasn't clear, I was comparing the adapter to a pig tail, I'm sure the pig tail has higher chances to affect the sound due to the length of the cable rather then a short adapter.The length of the wires being used will not affect the sound that much, considering it is super short. Under these circumstances, you can increase the sizes of the wires to offset the resistances + materials being used
But again, it also depend which cable and soldering material has been used, the variables are quite high.