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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)).
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The AK4951 includes separate pins for speaker and headphone output.
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The AK4951 includes separate pins for speaker and headphone output:
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* Pins 20 (SPP) and 19 (SPN) labeled as **SP**eaker **P**ositive and **SP**eaker **N**egative
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* Pins 22 (HPL) and 23 (HPR) as in (**H**ead**P**hones **L**eft, **H**ead**P**ones **R**ight).
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Upon close inspection, several differences arise:
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... | ... | @@ -15,7 +19,7 @@ The speaker audio header is switched on/off by the headphone female connector, w |
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## Audio in H1 model
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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.
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The soldering pads for an internal speaker connector header are present. The speaker +/GND signals on the pad are routed directly into AK4951 pins.
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**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._
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