Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Samsung - HW-Q800D | Samsung - HW-Q990D |
|---|---|---|
| Total power | 360 W | 656 W |
Between the HW-Q800D and HW-Q990D, the HW-Q800D comes out ahead in several specs, while the HW-Q990D wins on total power. Overall, the HW-Q800D scores 83 and the HW-Q990D scores 88.6 on our Mars Score.
Which should you buy?
The HW-Q990D edges ahead on the Mars Score (83 vs 88.6), but the 5.6-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The HW-Q800D 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 HW-Q990D if you care most about total power. Its strongest claims are total power. The single most decisive one: Total power — 82.22% more. 656 W vs 360 W.
Both ship with comparable dolby atmos, earc, subwoofer included, so those specs do not separate the two — focus on the differences below.
Bottom line: the HW-Q990D 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: Samsung - HW-Q800D or Samsung - HW-Q990D?
Samsung - HW-Q990D leads the current Mars Score by 5.6 points.The more useful decision is the trade-off behind that result: compare total power against the way you will actually use the product.
Choose Samsung - HW-Q800D if…
Samsung - HW-Q800D does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Samsung - HW-Q990D if…
Samsung - HW-Q990D has the measurable edge on total 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 Samsung - HW-Q800D wins
- No decisive advantages.
Why Samsung - HW-Q990D wins
- ▲Total power — 82.22% more. 656 W vs 360 W.
Spec comparison
Audio
| Spec | Samsung - HW-Q800D | Samsung - HW-Q990D |
|---|---|---|
| Channels | 5.1.2 | 11.1.4 |
| Total power | 360 W | 656 Wlead |
| Dolby Atmosⓘ | true | true |
| DTS:X | true | true |
Connectivity
| Spec | Samsung - HW-Q800D | Samsung - HW-Q990D |
|---|---|---|
| HDMI inputs | 1 | 2lead |
| eARCⓘ | true | true |
| Subwoofer included | true | true |