I also have a Oled Vita and I tested both out. The Slim’s speaker sounds louder but when I was on the main I couldn’t help but notice that there was a distortion type of sound from the music of the home screen and the Oled Vita doesn’t have that. Now it’s not bad at all but it’s a little distracting. When I conver one side of the speaker with my thumb I notice that it was the right side speaker. It sounds a little fuzzy. I was wondering if anyone here can test this out for me or someone that has an oled and slim vita. They shouldn’t sound the same.