Short answer: the Pro Audio Technology LFC-24sm for better sound quality, the Monoprice Monolith 16 THX Ultra for the lower price. The Pro Audio Technology LFC-24sm ranks #4 of 110 subwoofers at $10000. The Monoprice Monolith 16 THX Ultra ranks #18 at $2300, $7700 cheaper.
What the Monoprice Monolith 16 THX Ultra offers: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it. Watch for: Heavy at 78 kg and ported design can interact with room acoustics.
What the Pro Audio Technology LFC-24sm offers: Independent CEA-2010 testing records 123.7 dB at 20 Hz and 135.5 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 24” (610mm) driver is best suited to demanding film bass in a large room. Watch for: The 660.4H x 1536.7W x 533.4D mm cabinet and 120.7 kg mass still need deliberate placement and calibration.
Buy the Monoprice Monolith 16 THX Ultra if the price is the priority over sound quality, or the Pro Audio Technology LFC-24sm if sound quality is the priority over the price.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| Monoprice Monolith 16 THX Ultra | Pro Audio Technology LFC-24sm | |
|---|---|---|
| Price | $2,300 | $10,000 Passive |
| Ranked | #18 of 110 in Large Home Subwoofers (Over 75 lbs) | #4 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 15 Hz | 107.3 dB | - |
| Output SPL at 20 Hz | 118.4 dB | 123.7 dB |
| Output SPL at 25 Hz | 123.3 dB | 131.4 dB |
| Output SPL at 31.5 Hz | 125.1 dB | 133.6 dB |
| Output SPL at 40 Hz | 126.3 dB | 135.4 dB |
| Output SPL at 50 Hz | 126.5 dB | 136.0 dB |
| Output SPL at 63 Hz | 126.6 dB | 135.2 dB |
| Output SPL at 80 Hz | 126.8 dB | - |
| Output SPL at 100 Hz | 127.2 dB | - |
| Output SPL at 125 Hz | 127.6 dB | - |
| CEA-2010-A Average (40-80Hz) | 126.5 dB | 135.5 dB (avg of 3/4 bands) |
| Dimensions | 25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm) | 26"H x 60.5"W x 21"D (660.4 x 1536.7 x 533.4 mm) |
| Weight | 171.5 lbs (77.8 kg) | 266.1 lbs (120.7 kg) |
| Warranty | 5 | - |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Brent Butterworth |
| Drivers | 16" (406mm) driver | 24" (610mm) driver |
| Passive | - | Yes |
Related Speaker Comparisons
How Pro Audio Technology LFC-24sm compares with other leading options:
- Pro Audio Technology LFC-24sm vs WW Speaker Cabinets X21 - B&C 21DS115-4
- JTR Speakers Captivator S2 vs Pro Audio Technology LFC-24sm
- JTR Speakers Growler (2015) vs Pro Audio Technology LFC-24sm
- Danley Sound Labs DTS10 vs Pro Audio Technology LFC-24sm
- Reaction Audio PV-15X vs Pro Audio Technology LFC-24sm
Prices on this page were last checked September 14, 2026 at 1:47 AM 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
Monoprice Monolith 16 THX Ultra: $2,300 eBay
Pros: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it.
Cons: Heavy at 78 kg and ported design can interact with room acoustics.
Notes: Product # 42031
Full Monoprice Monolith 16 THX Ultra review and specifications →
| CEA-2010-A Average (40-80Hz) | 126.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm) |
| Drivers | 16" (406mm) driver |
| Enclosure | ported, front |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 107.3 dB |
| Output SPL at 20 Hz | 118.4 dB |
| Output SPL at 25 Hz | 123.3 dB |
| Output SPL at 31.5 Hz | 125.1 dB |
| Output SPL at 40 Hz | 126.3 dB |
| Output SPL at 50 Hz | 126.5 dB |
| Output SPL at 63 Hz | 126.6 dB |
| Output SPL at 80 Hz | 126.8 dB |
| Output SPL at 100 Hz | 127.2 dB |
| Output SPL at 125 Hz | 127.6 dB |
| Warranty | 5 |
| Weight | 171.5 lbs (77.8 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Monoprice Monolith 16 THX Ultra vs Harbottle Audio C24 L2
- Monoprice Monolith 16 THX Ultra vs Funk Audio Ultra 21.0LX
- Monoprice Monolith 16 THX Ultra vs Funk Audio Classic 18.0
- Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator 2400
- Monoprice Monolith 16 THX Ultra vs Reaction Audio PV-15X
- Monoprice Monolith 16 THX Ultra vs Harbinger V2218S
- Monoprice Monolith 16 THX Ultra vs Danley Sound Labs DTS10
- Monoprice Monolith 16 THX Ultra vs Rythmik FV25HP
- See all 54 comparisons
Pro Audio Technology LFC-24sm: $10,000 Passive eBay
Pros: Independent CEA-2010 testing records 123.7 dB at 20 Hz and 135.5 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 24” (610mm) driver is best suited to demanding film bass in a large room.
Cons: The 660.4H x 1536.7W x 533.4D mm cabinet and 120.7 kg mass still need deliberate placement and calibration.
Full Pro Audio Technology LFC-24sm review and specifications →
| CEA-2010-A Average (40-80Hz) | 135.5 dB (avg of 3/4 bands) |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 26"H x 60.5"W x 21"D (660.4 x 1536.7 x 533.4 mm) |
| Drivers | 24" (610mm) driver |
| Enclosure | ported, front |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 123.7 dB |
| Output SPL at 25 Hz | 131.4 dB |
| Output SPL at 31.5 Hz | 133.6 dB |
| Output SPL at 40 Hz | 135.4 dB |
| Output SPL at 50 Hz | 136.0 dB |
| Output SPL at 63 Hz | 135.2 dB |
| Passive | Yes |
| Weight | 266.1 lbs (120.7 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Pro Audio Technology LFC-24sm vs WW Speaker Cabinets X21 - B&C 21DS115-4
- Pro Audio Technology LFC-24sm vs JTR Speakers Captivator S2
- Pro Audio Technology LFC-24sm vs JTR Speakers Growler (2015)
- Pro Audio Technology LFC-24sm vs Danley Sound Labs DTS10
- Pro Audio Technology LFC-24sm vs Reaction Audio PV-15X
- Pro Audio Technology LFC-24sm vs JBL 4645C
- Pro Audio Technology LFC-24sm vs Chase Home Theater SS18.1
- Pro Audio Technology LFC-24sm vs HSU Research VTF-3 MK5 HP