Short answer: the Genelec HTS4B. It ranks #93 of 97 subwoofers by sound quality at $2995; the BK Electronics Monolith-DF ranks #94 and costs $8995, which makes this an easy call rather than a real tradeoff.
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.
What the Genelec HTS4B offers: Independent CEA-2010 testing records 97.9 dB at 20 Hz and 110.3 dB through 40-80 Hz. The passive radiator enclosure with 12” (305mm) 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 517.4H x 482.6W x 465.1D mm cabinet and 37.0 kg mass still require deliberate placement and calibration.
Buy the Genelec HTS4B. It ranks higher for sound quality than the BK Electronics Monolith-DF and costs less, so the other one has nothing left to offer.
Skip both if sound quality is the priority. There are better options higher up the 97 subwoofers.
Specifications Side By Side
| BK Electronics Monolith-DF | Genelec HTS4B | |
|---|---|---|
| Price | $8995 | $2995 |
| Ranked | #94 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #93 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, bottom | passive radiator |
| Output SPL at 15 Hz | 91.3 dB | 92.1 dB |
| Output SPL at 20 Hz | 102.0 dB | 97.9 dB |
| Output SPL at 25 Hz | 106.4 dB | 100.2 dB |
| Output SPL at 31.5 Hz | 108.3 dB | 103.3 dB |
| Output SPL at 40 Hz | 108.6 dB | 107.3 dB |
| Output SPL at 50 Hz | 108.7 dB | 110.1 dB |
| Output SPL at 63 Hz | 108.6 dB | 111.6 dB |
| Output SPL at 80 Hz | 107.7 dB | 112.3 dB |
| CEA-2010-A Average (40-80Hz) | 108.4 dB | 110.3 dB |
| Dimensions | 23.8"H x 21.3"W x 16.5"D (603.8 x 539.8 x 419.9 mm) | 20.4"H x 19"W x 18.3"D (517.4 x 482.6 x 465.1 mm) |
| Weight | 103.2 lbs / 46.8 kg | 81.6 lbs / 37.0 kg |
| Warranty | 2 | 2(+3) |
| Cabinet Color | black, wood | - |
| Country | United Kingdom | Finland |
| Measurement Source | Ilkka Rissanen | Ilkka Rissanen |
| Drivers | 12" (305mm) driver with ported design | 12" (305mm) driver |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- Magico Audio ASUB vs Genelec 7070A
- Monoprice THX 121456 vs SVS SB13-Plus
- Genelec 7070A vs Velodyne Acoustics DD-15
- SVS SB13-Plus vs BK Electronics Monolith-DF
- Genelec HTS4B vs Magico Audio ASUB
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
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
Genelec HTS4B: $2995 eBay
Pros: Independent CEA-2010 testing records 97.9 dB at 20 Hz and 110.3 dB through 40-80 Hz. The passive radiator enclosure with 12” (305mm) 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 517.4H x 482.6W x 465.1D mm cabinet and 37.0 kg mass still require deliberate placement and calibration.
Full Genelec HTS4B review and specifications →
| CEA-2010-A Average (40-80Hz) | 110.3 dB |
|---|---|
| Country | Finland |
| Dimensions | 20.4"H x 19"W x 18.3"D (517.4 x 482.6 x 465.1 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | passive radiator |
| Measurement Source | Ilkka Rissanen |
| Output SPL at 15 Hz | 92.1 dB |
| Output SPL at 20 Hz | 97.9 dB |
| Output SPL at 25 Hz | 100.2 dB |
| Output SPL at 31.5 Hz | 103.3 dB |
| Output SPL at 40 Hz | 107.3 dB |
| Output SPL at 50 Hz | 110.1 dB |
| Output SPL at 63 Hz | 111.6 dB |
| Output SPL at 80 Hz | 112.3 dB |
| Warranty | 2(+3) |
| Weight | 81.6 lbs / 37.0 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons