Short answer: the Funk Audio Classic 18.0 if sound quality matters most, the Monoprice Monolith 16 THX Ultra if price matters most. The Funk Audio Classic 18.0 ranks #11 of 97 subwoofers at $4893.35. The Monoprice Monolith 16 THX Ultra ranks #13 at $2300, $2593.35 cheaper.
What the Monoprice Monolith 16 THX Ultra gets right: 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. Set against that: Heavy at 78 kg (172 lbs) and ported design can interact with room acoustics.
Buy the Funk Audio Classic 18.0 when sound quality outweighs the price for you, and the Monoprice Monolith 16 THX Ultra when the price outweighs sound quality instead.
Specifications Side By Side
| Funk Audio Classic 18.0 | Monoprice Monolith 16 THX Ultra | |
|---|---|---|
| Price | $4,893.35 | $2,300 |
| Ranked | #11 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #13 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Output SPL at 10 Hz | 94.6 dB | - |
| Output SPL at 12.5 Hz | 98.4 dB | - |
| Output SPL at 15 Hz | 102.3 dB | 107.3 dB |
| Output SPL at 20 Hz | 106.5 dB | 118.4 dB |
| Output SPL at 25 Hz | 111.7 dB | 123.3 dB |
| Output SPL at 31.5 Hz | 119.0 dB | 125.1 dB |
| Output SPL at 40 Hz | 124.6 dB | 126.3 dB |
| Output SPL at 50 Hz | 126.8 dB | 126.5 dB |
| Output SPL at 63 Hz | 128.4 dB | 126.6 dB |
| Output SPL at 80 Hz | 129.6 dB | 126.8 dB |
| Output SPL at 100 Hz | 130.2 dB | 127.2 dB |
| Output SPL at 125 Hz | 130.8 dB | 127.6 dB |
| CEA-2010-A Average (40-80Hz) | 127.3 dB | 126.5 dB |
| Dimensions | 22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm) | 25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm) |
| Weight | 115.1 lbs / 52.2 kg | 171.5 lbs / 77.8 kg |
| Warranty | 3 | 5 |
| Cabinet Color | wood, custom | black |
| Country | Canada | United States |
| Measurement Source | Data-bass | Audioholics |
| Drivers | 18" (457mm) driver | 16" (406mm) driver |
Related Speaker Comparisons
More worthwhile head-to-heads for Funk Audio Classic 18.0:
- Funk Audio Classic 18.0 vs Funk Audio Ultra 24.0
- Funk Audio Classic 18.0 vs Funk Audio Custom 21.0
- Funk Audio Classic 18.0 vs Harbottle Audio C24 L2
- JTR Speakers Captivator 4000ULF vs Monoprice Monolith 16 THX Ultra
- JTR Speakers Orbit Shifter PRO vs Monoprice Monolith 16 THX Ultra
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
Funk Audio Classic 18.0: $4,893.35 eBay
Pros: Independent CEA-2010 testing records 106.5 dB at 20 Hz and 127.3 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver delivers formidable 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 571.5H x 558.8W x 520.7D mm cabinet and 52.2 kg mass still require deliberate placement and calibration.
Notes: Data-bass labeled this sub as ‘FW18.0’, but original name is 18.0
Full Funk Audio Classic 18.0 review and specifications →
| CEA-2010-A Average (40-80Hz) | 127.3 dB |
|---|---|
| Cabinet Color | wood, custom |
| Country | Canada |
| Dimensions | 22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 94.6 dB |
| Output SPL at 12.5 Hz | 98.4 dB |
| Output SPL at 15 Hz | 102.3 dB |
| Output SPL at 20 Hz | 106.5 dB |
| Output SPL at 25 Hz | 111.7 dB |
| Output SPL at 31.5 Hz | 119.0 dB |
| Output SPL at 40 Hz | 124.6 dB |
| Output SPL at 50 Hz | 126.8 dB |
| Output SPL at 63 Hz | 128.4 dB |
| Output SPL at 80 Hz | 129.6 dB |
| Output SPL at 100 Hz | 130.2 dB |
| Output SPL at 125 Hz | 130.8 dB |
| Warranty | 3 |
| Weight | 115.1 lbs / 52.2 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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
- 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 JTR Speakers Captivator 2400
- Monoprice Monolith 16 THX Ultra vs Reaction Audio PV-15X
- Monoprice Monolith 16 THX Ultra vs Monoprice Monolith M-215
- Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator S2
- Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator 4000ULF
- Monoprice Monolith 16 THX Ultra vs Power Sound Audio (PSA) TRIAX
- See all 18 comparisons