KEF KUBE-8-MIE vs Power Sound Audio S1813M-PRIMARY
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Choosing between the KEF KUBE-8-MIE and Power Sound Audio S1813M-PRIMARY? Both compete in the Subwoofer segment. Here’s how they compare across the specs that matter most for your home theater.
Pricing for both models is currently unavailable. Check the retailer links below for current deals.
Looking at overall performance dimensions: The KEF KUBE-8-MIE scores higher in value, form factor, room fit. The Power Sound Audio S1813M-PRIMARY leads in audio quality, volume/SPL.
Key subwoofer differences include driver sizes of 8" vs 18". Larger drivers move more air, producing deeper bass with less effort. A 15-inch driver reaches lower than a 10-inch at the same power, but the cabinet is proportionally larger.
These two Subwoofer options trade wins across different dimensions. The right choice depends on which specs matter most for your room and listening preferences — review the detailed table below to decide.
For most home theaters, the KEF KUBE-8-MIE is the stronger choice — it leads in 3 of 5 scored dimensions. The Power Sound Audio S1813M-PRIMARY makes more sense if you prioritize the 2 dimensions where it leads.
Performance Overview
Scores based on specs and category benchmarks (0–100 scale)
KEF KUBE-8-MIE
Power Sound Audio S1813M-PRIMARY
Detailed Specifications
| Specification | ||
|---|---|---|
| Price | N/A | N/A |
| Driver Size | 8" | 18" |
| RMS Watts | 300W | 4000W |
| -3dB Extension | — | 17Hz |
| -6dB Extension | — | — |
| Phase Control | No | No |
| LFE Input | Yes | No |
| Line Input | No | Yes |
| XLR Input | No | Yes |
| App Control | No | No |
| Passive | No | No |
| Enclosure | sealed | sealed |
Key Differences
- RMS Watts: KEF KUBE-8-MIE at 300W vs Power Sound Audio S1813M-PRIMARY at 4000W. More sustained power means the sub maintains authority at high volumes without compression. RMS matters more than peak — it's the power available all the time, not just in bursts.
- Driver Size: KEF KUBE-8-MIE at 8" vs Power Sound Audio S1813M-PRIMARY at 18". Larger drivers move more air, producing deeper bass with less effort. A 15-inch driver reaches lower than a 10-inch at the same power, but the cabinet is proportionally larger.
- -3dB Extension: KEF KUBE-8-MIE at — vs Power Sound Audio S1813M-PRIMARY at 17Hz. A lower number means deeper bass — the rumble in explosions, the weight of a pipe organ. Below 20 Hz you feel it more than hear it.
- LFE Input: KEF KUBE-8-MIE at Yes vs Power Sound Audio S1813M-PRIMARY at No
- Line Input: KEF KUBE-8-MIE at No vs Power Sound Audio S1813M-PRIMARY at Yes
Which Should You Choose?
Choose Power Sound Audio S1813M-PRIMARY if you want:
- + larger 18" driver
- + better rms watts — more sustained power means the sub maintains authority at high volumes without compression
See Where These Rank
Check our editorial rankings to see how KEF KUBE-8-MIE and Power Sound Audio S1813M-PRIMARY compare to the rest of the field.
Best Subwoofer RankingsRelated Calculators
Specifications sourced from manufacturer datasheets and verified against retailer listings. Prices updated hourly from authorized retailers. Scoring uses our open methodology — products are never ranked, promoted, or suppressed based on affiliate commission rates.
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