Wide range of Raspberry Pi I2S Amplifier Sound Cards with detailed comparison. Tested 192Khz/ 24Bit Audio HATs for passive speakers by HiFiBerry, IQaudIO, JustBoom, Allo, Audiophonics. The Class-D Amps are stacked on top of the Raspberry Pi and replace an external amplifier. Allowing your Raspberry to be connected directly to your speakers. .For a detailed example for using this bundle, check out this article about using Max2Play in your bedroom and bathroom!