Short answer: the BK Electronics Monolith-DF if sound quality matters most, the SVS SB13-Plus if price matters most. The BK Electronics Monolith-DF ranks #94 of 97 subwoofers at $8995. The SVS SB13-Plus ranks #95 at $1399, $7596 cheaper.
What the SVS SB13-Plus offers: Independent CEA-2010 testing records 92.3 dB at 20 Hz and 108.1 dB (avg of 3/4 bands) through 40-80 Hz. The sealed enclosure with 13” (330mm) driver delivers substantial upper-bass output for movie effects and music. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 431.8H x 431.8W x 457.2D mm cabinet and 43.1 kg mass still require deliberate placement and calibration.
What the BK Electronics Monolith-DF offers: Independent CEA-2010 testing records 102.0 dB at 20 Hz and 108.4 dB through 40-80 Hz. The ported, bottom enclosure with 12” (305mm) driver with ported design delivers substantial upper-bass output for movie effects and music. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 603.8H x 539.8W x 419.9D mm cabinet and 46.8 kg mass still require deliberate placement and calibration.
Buy the SVS SB13-Plus if the price matters more than sound quality. Buy the BK Electronics Monolith-DF if sound quality matters more than the price.
If sound quality matters at all to you, skip both of these and look higher up the 97 subwoofers instead.
Specifications Side By Side
| SVS SB13-Plus | BK Electronics Monolith-DF | |
|---|---|---|
| Price | $1399 | $8995 |
| Ranked | #95 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #94 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, bottom |
| Output SPL at 20 Hz | 92.3 dB | 102.0 dB |
| Output SPL at 25 Hz | 97.2 dB | 106.4 dB |
| Output SPL at 31.5 Hz | 97.2 dB | 108.3 dB |
| Output SPL at 40 Hz | 108.1 dB | 108.6 dB |
| Output SPL at 50 Hz | 108.1 dB | 108.7 dB |
| Output SPL at 63 Hz | 108.1 dB | 108.6 dB |
| CEA-2010-A Average (40-80Hz) | 108.1 dB (avg of 3/4 bands) | 108.4 dB |
| Dimensions | 17"H x 17"W x 18"D (431.8 x 431.8 x 457.2 mm) | 23.8"H x 21.3"W x 16.5"D (603.8 x 539.8 x 419.9 mm) |
| Weight | 95 lbs / 43.1 kg | 103.2 lbs / 46.8 kg |
| Warranty | 5 | 2 |
| Country | United States | United Kingdom |
| Measurement Source | Brent Butterworth | Ilkka Rissanen |
| Drivers | 13" (330mm) driver | 12" (305mm) driver with ported design |
| Output SPL at 15 Hz | - | 91.3 dB |
| Output SPL at 80 Hz | - | 107.7 dB |
| Cabinet Color | - | black, wood |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- Genelec HTS4B vs Magico Audio ASUB
- Magico Audio ASUB vs Genelec 7070A
- Genelec 7070A vs Velodyne Acoustics DD-15
- BK Electronics Monolith-DF vs Genelec HTS4B
- Monoprice THX 121456 vs SVS SB13-Plus
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.
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The Two Speakers In Full
SVS SB13-Plus: $1399 eBay
Pros: Independent CEA-2010 testing records 92.3 dB at 20 Hz and 108.1 dB (avg of 3/4 bands) through 40-80 Hz. The sealed enclosure with 13” (330mm) driver delivers substantial upper-bass output for movie effects and music.
Cons: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 431.8H x 431.8W x 457.2D mm cabinet and 43.1 kg mass still require deliberate placement and calibration.
Full SVS SB13-Plus review and specifications →
| CEA-2010-A Average (40-80Hz) | 108.1 dB (avg of 3/4 bands) |
|---|---|
| Country | United States |
| Dimensions | 17"H x 17"W x 18"D (431.8 x 431.8 x 457.2 mm) |
| Drivers | 13" (330mm) driver |
| Enclosure | sealed |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 92.3 dB |
| Output SPL at 25 Hz | 97.2 dB |
| Output SPL at 31.5 Hz | 97.2 dB |
| Output SPL at 40 Hz | 108.1 dB |
| Output SPL at 50 Hz | 108.1 dB |
| Output SPL at 63 Hz | 108.1 dB |
| Warranty | 5 |
| Weight | 95 lbs / 43.1 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
BK Electronics Monolith-DF: $8995 eBay
Pros: Independent CEA-2010 testing records 102.0 dB at 20 Hz and 108.4 dB through 40-80 Hz. The ported, bottom enclosure with 12” (305mm) driver with ported design delivers substantial upper-bass output for movie effects and music.
Cons: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 603.8H x 539.8W x 419.9D mm cabinet and 46.8 kg mass still require deliberate placement and calibration.
Full BK Electronics Monolith-DF review and specifications →
| CEA-2010-A Average (40-80Hz) | 108.4 dB |
|---|---|
| Cabinet Color | black, wood |
| Country | United Kingdom |
| Dimensions | 23.8"H x 21.3"W x 16.5"D (603.8 x 539.8 x 419.9 mm) |
| Drivers | 12" (305mm) driver with ported design |
| Enclosure | ported, bottom |
| Measurement Source | Ilkka Rissanen |
| Output SPL at 15 Hz | 91.3 dB |
| Output SPL at 20 Hz | 102.0 dB |
| Output SPL at 25 Hz | 106.4 dB |
| Output SPL at 31.5 Hz | 108.3 dB |
| Output SPL at 40 Hz | 108.6 dB |
| Output SPL at 50 Hz | 108.7 dB |
| Output SPL at 63 Hz | 108.6 dB |
| Output SPL at 80 Hz | 107.7 dB |
| Warranty | 2 |
| Weight | 103.2 lbs / 46.8 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons