Short answer: the Sony Bravia Theater Sub 8. It ranks #32 of 73 subwoofers by sound quality, rated 3.4/5, at $348; the KRK S8.4 ranks #42, rated 3.3/5, and costs $369, so there is little reason to consider the other one.
The case for the Sony Bravia Theater Sub 8: The middle wireless subwoofer for Sony’s BRAVIA Theater soundbars, with a 200mm aluminum driver and a 300W amplifier in a 170mm wide cabinet that can stand upright or lie flat. Watch for: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from the measured Sony Bravia Theater Sub 9 (112.8dB in the 40 to 80Hz CEA-2010 bands), and it should fall short of that model.
What the KRK S8.4 does well: The 8” studio subwoofer in KRK’s fourth generation, with a glass aramid woofer, a 109W Class D amplifier and a four-position crossover for pairing with Rokit monitors. The catch: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from KRK’s measured 12S (117.1dB in the 40 to 80Hz CEA-2010 bands).
Buy the Sony Bravia Theater Sub 8. It is rated higher for sound quality than the KRK S8.4 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
About the ratings: neither speaker has been measured yet, so both ratings are estimated from measured siblings and predecessors (likely ranges: Sony Bravia Theater Sub 8 3.0 to 3.7; KRK S8.4 2.9 to 3.6). Treat this verdict as provisional.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Sony Bravia Theater Sub 8 | KRK S8.4 | |
|---|---|---|
| Price | $348.00 | $369.00 |
| Ranked | #32 of 73 in Small Home Subwoofers (Under 30 lbs) Estimated | #42 of 73 in Small Home Subwoofers (Under 30 lbs) Estimated |
| Country | Japan | United States |
| Warranty | 1 | 3 |
| Enclosure | ported | ported |
| Drivers | 7.9” (200mm) aluminum driver | 8” glass aramid composite woofer |
| Amplifier Power | 300W | 109W Class D |
| Dimensions | 15.7”H x 6.7”W x 15.4”D (400 x 170 x 390 mm) | 11”H x 16.1”W x 11.5”D (279 x 410 x 292 mm) |
| Weight | 26.9 lbs (12.2 kg) | 26.5 lbs (12 kg) |
| Frequency Response | - | 34-133Hz ±3dB (manufacturer specified) |
| Maximum SPL | - | 113dB (manufacturer specified) |
| XLR Input | - | Yes |
| AES Input | - | No |
Related Speaker Comparisons
More top alternatives to Sony Bravia Theater Sub 8:
- Sony Bravia Theater Sub 8 vs Sony Bravia Theater Sub 7
- KRK S8.4 vs Sonos Sub Mini
- Klipsch Flexus Sub 100 vs KRK S8.4
- Sony Bravia Theater Sub 9 vs Sony Bravia Theater Sub 8
- MartinLogan Dynamo Foundation 12 vs MartinLogan Dynamo Foundation 10
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Sony Bravia Theater Sub 8: $348.00 Estimated Amazon eBay
Same family: the Sony Bravia Theater Sub 7 (smaller subwoofer, ranked lower, estimated 2.9/5) and the Sony Bravia Theater Sub 9 (larger subwoofer, rated 3.7/5).
Pros: The middle wireless subwoofer for Sony’s BRAVIA Theater soundbars, with a 200mm aluminum driver and a 300W amplifier in a 170mm wide cabinet that can stand upright or lie flat. Two can be paired for more even bass.
Cons: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from the measured Sony Bravia Theater Sub 9 (112.8dB in the 40 to 80Hz CEA-2010 bands), and it should fall short of that model. It only works with compatible Sony soundbars.
Full Sony Bravia Theater Sub 8 review and specifications →
| Released | Jul 2026 (3 months ago) |
|---|---|
| Amplifier Power | 300W |
| Country | Japan |
| Dimensions | 15.7”H x 6.7”W x 15.4”D (400 x 170 x 390 mm) |
| Drivers | 7.9” (200mm) aluminum driver |
| Enclosure | ported |
| Warranty | 1 |
| Weight | 26.9 lbs (12.2 kg) |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
KRK S8.4: $369.00 Estimated Amazon Sweetwater eBay
Same family: the KRK S10.4 (larger subwoofer, estimated 3.6/5) and the KRK S12.4 (larger subwoofer, estimated 3.9/5). See every KRK S Subwoofers generation.
Pros: The 8” studio subwoofer in KRK’s fourth generation, with a glass aramid woofer, a 109W Class D amplifier and a four-position crossover for pairing with Rokit monitors. Rated 34 to 133Hz (±3dB) and 113dB.
Cons: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from KRK’s measured 12S (117.1dB in the 40 to 80Hz CEA-2010 bands). An 8” driver gives up deep bass and output to larger subs.
Full KRK S8.4 review and specifications →
| Released | 2021 (5 years ago) |
|---|---|
| AES Input | No |
| Amplifier Power | 109W Class D |
| Country | United States |
| Dimensions | 11”H x 16.1”W x 11.5”D (279 x 410 x 292 mm) |
| Drivers | 8” glass aramid composite woofer |
| Enclosure | ported |
| Frequency Response | 34-133Hz ±3dB (manufacturer specified) |
| Maximum SPL | 113dB (manufacturer specified) |
| Warranty | 3 |
| Weight | 26.5 lbs (12 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons