Pulse Width Modulation (PWM) vs an Inter-IC Sound Digital to Analog Converter (I2S DAC)

I spent a long time today capturing images from my scope in preparation for a post about using I2S to output audio. I thought it'd be interesting to see the differences between audio playback using PWM with no RC filter, the two-order RC filter from yesterday and then a cheap I2S DAC (the CS4334). The results were interesting and I'll post something about them in my next post on getting I2S to work. Until then, enjoy this 80's-style monstrosity I whipped up in Photoshop!