I saw that when I was building mine out but wasn't going to spend the time looking for the n-1 chips. I have LM386L chips in mine which are basically the 4 iirc. I don't buy that it makes a difference, a 386 is a 386 in this application. I don't get the hiss and my guess is that she's right and they aren't even real LM386 chips
I also don't like sockets in the vast majority of applications especially when not prototyping or experimenting with a build