Short answer: the Dayton Audio MKSX4. It ranks #1 of 2 subwoofers by sound quality at $144.98; the BG Radia BGX-S6B ranks #2 and costs $189, so there is not much of a tradeoff to weigh.
On the BG Radia BGX-S6B side: Six 4-inch drivers in a low-profile in-wall panel deliver 102.1dB CEA-2010-A average. The tradeoff: In-wall installation required, limited 102.1 dB output, passive design, and compact 7.3 kg (16.1 lbs) constraints.
The case for the Dayton Audio MKSX4: Four 4-inch drivers in a low-profile (under 8-inch) cabinet deliver 106.2dB CEA-2010-A average. The tradeoff: Budget-tier output at 106.2 dB, four small 4-inch drivers, ported room dependency, and $145 price point.
One note: the BG Radia BGX-S6B is no longer sold new, but at #2 of 2 subwoofers by sound quality it still outranks most current models, so used is worth considering.
Buy the Dayton Audio MKSX4. It ranks higher for sound quality than the BG Radia BGX-S6B and costs less, so the other one has nothing left to offer.
Specifications Side By Side
| BG Radia BGX-S6B | Dayton Audio MKSX4 | |
|---|---|---|
| Price | $189 Discontinued | $144.98 |
| Ranked | #2 of 2 in Small Passive Home Subwoofers (Under 30 lbs) | #1 of 2 in Small Passive Home Subwoofers (Under 30 lbs) |
| Enclosure | in-wall | ported, rear |
| Passive | Yes | Yes |
| Output SPL at 20 Hz | 82.3 dB | - |
| Output SPL at 25 Hz | 82.3 dB | - |
| Output SPL at 31.5 Hz | 82.3 dB | 78.7 dB |
| Output SPL at 40 Hz | 102.1 dB | 95.4 dB |
| Output SPL at 50 Hz | 102.1 dB | 106.8 dB |
| Output SPL at 63 Hz | 102.1 dB | 110.3 dB |
| CEA-2010-A Average (40-80Hz) | 102.1 dB (avg of 3/4 bands) | 106.2 dB |
| Dimensions | 14"H x 14"W x 3.7"D (355.6 x 355.6 x 95.2 mm) | 16"H x 5.9"W x 14"D (406.4 x 149.9 x 355.6 mm) |
| Weight | 16.1 lbs / 7.3 kg | 26.9 lbs / 12.2 kg |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Discontinued | Yes | - |
| Drivers | 6x 4" (102mm) driver | 4x 4" (102mm) driver |
| Output SPL at 80 Hz | - | 112.3 dB |
| Warranty | - | 5 |
| Cabinet Color | - | black |
| Country | - | United States |
Related Speaker Comparisons
How Dayton Audio MKSX4 compares with other leading options:
- Dayton Audio SUB-1200 vs Monoprice Premium Select 8in 200-Watt
- Monoprice 10in Powered Studio Multimedia vs Monoprice Premium Select 8in 200-Watt
- Monoprice Premium Select 8in 200-Watt vs Polk Audio PSW10
- Monoprice SW-12 vs Polk Audio PSW10
- Dayton Audio SUB-1500 vs Polk Audio PSW10
Prices on this page were last checked September 8, 2026 at 6:02 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
BG Radia BGX-S6B: $189 Discontinued eBay
Pros: Six 4-inch drivers in a low-profile in-wall panel deliver 102.1dB CEA-2010-A average, a flush-mount alternative for rooms where a cabinet subwoofer won’t fit.
Cons: In-wall installation required, limited 102.1 dB output, passive design, and compact 7.3 kg constraints. Discontinued.
Notes: low profile (<8in)
Full BG Radia BGX-S6B review and specifications →
| CEA-2010-A Average (40-80Hz) | 102.1 dB (avg of 3/4 bands) |
|---|---|
| Dimensions | 14"H x 14"W x 3.7"D (355.6 x 355.6 x 95.2 mm) |
| Discontinued | Yes |
| Drivers | 6x 4" (102mm) driver |
| Enclosure | in-wall |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 82.3 dB |
| Output SPL at 25 Hz | 82.3 dB |
| Output SPL at 31.5 Hz | 82.3 dB |
| Output SPL at 40 Hz | 102.1 dB |
| Output SPL at 50 Hz | 102.1 dB |
| Output SPL at 63 Hz | 102.1 dB |
| Passive | Yes |
| Weight | 16.1 lbs / 7.3 kg |
- Links
- Reviews, Comparisons and Sound Samples
Dayton Audio MKSX4: $144.98 Amazon eBay
Pros: Four 4-inch drivers in a low-profile (under 8-inch) cabinet deliver 106.2dB CEA-2010-A average, the best output-per-dollar of any passive subwoofer tested.
Cons: Budget-tier output at 106.2 dB, four small 4-inch drivers, ported room dependency, and $145 price point.
Notes: low profile (<8in)
Full Dayton Audio MKSX4 review and specifications →
| CEA-2010-A Average (40-80Hz) | 106.2 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 16"H x 5.9"W x 14"D (406.4 x 149.9 x 355.6 mm) |
| Drivers | 4x 4" (102mm) driver |
| Enclosure | ported, rear |
| Measurement Source | Brent Butterworth |
| Output SPL at 31.5 Hz | 78.7 dB |
| Output SPL at 40 Hz | 95.4 dB |
| Output SPL at 50 Hz | 106.8 dB |
| Output SPL at 63 Hz | 110.3 dB |
| Output SPL at 80 Hz | 112.3 dB |
| Passive | Yes |
| Warranty | 5 |
| Weight | 26.9 lbs / 12.2 kg |
- Links
- Reviews, Comparisons and Sound Samples