Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Sonos - Symfonisk Bookshelf (Gen 2) | Sony - HT-A9 |
|---|---|---|
| Dolby Atmos | false | true |
| Output | 504 W |
Between the Symfonisk Bookshelf (Gen 2) and HT-A9, the Symfonisk Bookshelf (Gen 2) comes out ahead in several specs, while the HT-A9 wins on dolby atmos / output. Overall, the Symfonisk Bookshelf (Gen 2) scores 55 and the HT-A9 scores 71.1 on our Mars Score.
Which should you buy?
The HT-A9 is the clear pick on raw spec strength, leading by 16.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
The Symfonisk Bookshelf (Gen 2) does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the HT-A9 if you care most about dolby atmos / output. Its strongest claims are dolby atmos, output. The single most decisive one: Has Dolby Atmos.
Both ship with comparable matter / thread, so those specs do not separate the two — focus on the differences below.
Bottom line: the HT-A9 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: Sonos - Symfonisk Bookshelf (Gen 2) or Sony - HT-A9?
Sony - HT-A9 leads the current Mars Score by 16.1 points.The more useful decision is the trade-off behind that result: compare output, dolby atmos against the way you will actually use the product.
Choose Sonos - Symfonisk Bookshelf (Gen 2) if…
Sonos - Symfonisk Bookshelf (Gen 2) does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Sony - HT-A9 if…
Sony - HT-A9 has the measurable edge on has dolby atmos, output w.
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 Sonos - Symfonisk Bookshelf (Gen 2) wins
- No decisive advantages.
Why Sony - HT-A9 wins
- ▲Has Dolby Atmos.
- ▲Output: 504 W vs W.
Spec comparison
Audio
| Spec | Sonos - Symfonisk Bookshelf (Gen 2) | Sony - HT-A9 |
|---|---|---|
| Output | 504 Wlead | |
| Stereo pairingⓘ | true | true |
| Dolby Atmosⓘ | false | truelead |
| Built-in display | false | false |
Assistant & Smart Home
| Spec | Sonos - Symfonisk Bookshelf (Gen 2) | Sony - HT-A9 |
|---|---|---|
| Voice assistant | Alexa | Google Assistant |
| Matter / Thread | false | false |
| Zigbee hub | false | false |