Case is slightly larger (Left Picture Air Pod Pro 2 Left, Pro 3 Right)
Bud stem slightly larger, but the housings is smaller with larger speaker and mic openings (Right Picture Air Pod Pro 3 Left, Pro 2 Right)
Apple makes it easy to switch back and fourth, same song, same part of the song. I have both sets of pods connected to the phone. Using a mix of genre types (Arcane soundtrack, Tron Legacy Soundtrack, Metallica, Doja Cat, Cream, Stevie Ray Vaughan, Classical Piano, and a bass test track on Youtube), media, and spaces for the noise cancelling function, here are my observations as a long time Pro 2 user:
1) General Sound color is just different in general. Not enough anyone would probably care or have a preference most likely.
2) Sound stage is bigger and wider. Not astronomically so.
3) Volume switch between the two changes slightly all settings being the same with the Pro 3 being louder. Fairly significantly so.
4) Base response is is basically the same. Its slightly tighter in the #3 and slightly lower frequency respons. The wider sound stage make it a slightly difference response but nothing significant. The EQ on the #2 seem heavier on the bass, but not a huge difference. Likewise the #3 seem a little brighter.
5) There is more clarity to go along with the bigger sound in general.
6) The fit is quite a bit different. For me its better because I have smaller ears. The default bud seems great so far. Haven't tried jogging. They feel physically larger putting them in and out of the ear, holding the stem. They seem to fit slighter more inside the ear and the housing slightly smaller behind the foam earpiece, but that could just be part of the feel since they are quite a bit different. They are a little harder for me to take in and out of the ear, fit tighter. Earpiece material is softer, thicker and more subtle.
7) The #3 weigh more maybe. I'll have to weigh them on a food scale.
8) When listening to the headphones with no media playing, the noise canceling has a different "tone" than the #2 and have a lot less static. I'm assuming they made adjustments to frequency.
I will be interested in test with equipment to see if they match my ears. The fit is worth trying if you have trouble with the Pro 2. I didn't but the 3 fit better for me. I prefer the color of the sound and that's to say less color maybe on the low end, and bigger sound stage in the pro 3 but its not a huge difference that you need to rush out and upgrade for. Overall, they seem like a incremental step up in overall sound quality, more balanced, better low and high frequency response.
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