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)).
The AK4951 includes separate pins for speaker and headphone output.
The AK4951 includes separate pins for speaker and headphone output:
* Pins 20 (SPP) and 19 (SPN) labeled as **SP**eaker **P**ositive and **SP**eaker **N**egative
* Pins 22 (HPL) and 23 (HPR) as in (**H**ead**P**hones **L**eft, **H**ead**P**ones **R**ight).
Upon close inspection, several differences arise:
...
...
@@ -15,7 +19,7 @@ The speaker audio header is switched on/off by the headphone female connector, w
## 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.
The soldering pads for an internal speaker connector header are present. The speaker +/GND signals on the pad are routed directly into AK4951 pins.
**NOTE:** _There is no extra amplifier IC between the speaker pad and the AK4951. The AK4951 includes a speaker amplifier capable of 1W, when powered @5v._
