Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Google - Nest Audio | Sony - HT-A9 |
|---|---|---|
| Output | 75 W | 504 W |
| Matter / Thread | true | false |
| Dolby Atmos | false | true |
Between the Nest Audio and HT-A9, the Nest Audio comes out ahead in matter / thread, while the HT-A9 wins on output / dolby atmos. Overall, the Nest Audio scores 77.7 and the HT-A9 scores 71.1 on our Mars Score.
Which should you buy?
The Nest Audio edges ahead on the Mars Score (77.7 vs 71.1), but the 6.6-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Nest Audio if you care most about matter / thread. The biggest gaps in its favor are matter / thread. The single most decisive one: Has Matter / Thread.
Pick the HT-A9 if you care most about output / dolby atmos. Its strongest claims are output, dolby atmos. The single most decisive one: Output — 572.00% more. 504 W vs 75 W.
Both ship with comparable voice assistant, so those specs do not separate the two — focus on the differences below.
Bottom line: the Nest Audio is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Google - Nest Audio or Sony - HT-A9?
Google - Nest Audio leads the current Mars Score by 6.6 points.The more useful decision is the trade-off behind that result: compare output, dolby atmos, matter / thread against the way you will actually use the product.
Choose Google - Nest Audio if…
Google - Nest Audio has the measurable edge on has matter thread.
Choose Sony - HT-A9 if…
Sony - HT-A9 has the measurable edge on output w, has dolby atmos.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Google - Nest Audio wins
- ▲Has Matter / Thread.
Why Sony - HT-A9 wins
- ▲Output — 572.00% more. 504 W vs 75 W.
- ▲Has Dolby Atmos.
Spec comparison
Audio
| Spec | Google - Nest Audio | Sony - HT-A9 |
|---|---|---|
| Output | 75 W | 504 Wlead |
| Stereo pairingⓘ | true | true |
| Dolby Atmosⓘ | false | truelead |
| Built-in display | false | false |
Assistant & Smart Home
| Spec | Google - Nest Audio | Sony - HT-A9 |
|---|---|---|
| Voice assistant | Google Assistant | Google Assistant |
| Matter / Thread | truelead | false |
| Zigbee hub | false | false |