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 76.3 and the HW-Q990D scores 85.1 on our Mars Score.
Which should you buy?
The HW-Q990D is the clear pick on raw spec strength, leading by 8.8 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 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 8.8 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 |