Short answer: the Power Sound Audio (PSA) V3600I for better sound quality, the Monoprice Monolith 16 THX Ultra for the lower price. The Power Sound Audio (PSA) V3600I ranks #10 of 110 subwoofers at $6995. The Monoprice Monolith 16 THX Ultra ranks #18 at $2300, $4695 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 Power Sound Audio (PSA) V3600I offers: Published CEA-2010 specifications list 119.4 dB at 20 Hz and 128.3 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 2x 18” (457mm) driver has the headroom for demanding film bass in a large room. Watch for: The 1117.6H x 508.0W x 635.0D mm cabinet and 88.9 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Buy the Monoprice Monolith 16 THX Ultra if the price is the priority over sound quality, or the Power Sound Audio (PSA) V3600I if sound quality is the priority over the price.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| Monoprice Monolith 16 THX Ultra | Power Sound Audio (PSA) V3600I | |
|---|---|---|
| Price | $2,300 | $6995 |
| Ranked | #18 of 110 in Large Home Subwoofers (Over 75 lbs) | #10 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 | 119.4 dB |
| Output SPL at 25 Hz | 123.3 dB | 119.4 dB |
| Output SPL at 31.5 Hz | 125.1 dB | 119.4 dB |
| Output SPL at 40 Hz | 126.3 dB | 128.3 dB |
| Output SPL at 50 Hz | 126.5 dB | 128.3 dB |
| Output SPL at 63 Hz | 126.6 dB | 128.3 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 | 128.3 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) | 44"H x 20"W x 25"D (1117.6 x 508.0 x 635.0 mm) |
| Weight | 171.5 lbs (77.8 kg) | 196 lbs (88.9 kg) |
| Warranty | 5 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Audioholics | Manufacturer |
| Drivers | 16" (406mm) driver | 2x 18" (457mm) driver |
Related Speaker Comparisons
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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
Power Sound Audio (PSA) V3600I: $6995 eBay
Pros: Published CEA-2010 specifications list 119.4 dB at 20 Hz and 128.3 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 2x 18” (457mm) driver has the headroom for demanding film bass in a large room.
Cons: The 1117.6H x 508.0W x 635.0D mm cabinet and 88.9 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Full Power Sound Audio (PSA) V3600I review and specifications →
| CEA-2010-A Average (40-80Hz) | 128.3 dB (avg of 3/4 bands) |
|---|---|
| Country | United States |
| Dimensions | 44"H x 20"W x 25"D (1117.6 x 508.0 x 635.0 mm) |
| Drivers | 2x 18" (457mm) driver |
| Enclosure | ported, front |
| Measurement Source | Manufacturer |
| Output SPL at 20 Hz | 119.4 dB |
| Output SPL at 25 Hz | 119.4 dB |
| Output SPL at 31.5 Hz | 119.4 dB |
| Output SPL at 40 Hz | 128.3 dB |
| Output SPL at 50 Hz | 128.3 dB |
| Output SPL at 63 Hz | 128.3 dB |
| Warranty | 5 |
| Weight | 196 lbs (88.9 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons