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+# Audio
+
+At a glance, hardware-side, both models feature a **headphone connector** and the same **AK4951 AUDIO / CODEC IC**. You can get the datasheet [following this link](https://www.akm.com/content/dam/documents/products/audio/audio-codec/ak4951aen/ak4951aen-en-datasheet.pdf).
+
+After close inspection over each model's circuit, several differences are noticed:
+
+## Audio in H2 model
+Portapack H2 circuitboard includes a connector header for easily adding an internal speaker. 
+
+The **AK4951 IC** is rotated 180º and placed more into the middle of the circuit board, allowing for the addition of an extra IC: The **CS8122S** ultra-low EMI, filter-free, class-D amplifier, for driving the speaker output with up to 3W. 
+The speaker audio header is switched on/off by the headphone female connector, which includes the usual switch, detecting the insertion of a male plug in it.
+
+## Audio in H1 model
+
+The soldering pads for an internal speaker connector header are present. The speaker +/GND signals on the pad are routed into AK4951 pins 20 (SPP) and 19 (SPN) which are labeled as SPeaker Positive and SPeaker Negative.
+
+**NOTE:** _There is no extra amplifier IC in the middle._
+