Short answer: the Rythmik FV15HP, if you are buying new. The Monoprice Monolith 13 THX Ultra measures as well as it (#56 vs #48 of 110 subwoofers, 4.2/5 vs 4.2/5) but is discontinued, so only consider it used; the Rythmik FV15HP is still sold new at $2,127.
The case for the Rythmik FV15HP: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more. Watch for: Premium price ($2127), ported design room gain dependency, and mid-to-large 52 kg footprint.
The case for the Monoprice Monolith 13 THX Ultra: Independent CEA-2010 testing records 115.0 dB at 20 Hz and 121.1 dB through 40-80 Hz. The tradeoff: The 604.5H x 515.6W x 739.1D mm cabinet and 69.5 kg mass make this a serious placement and moving commitment.
Buy the Rythmik FV15HP if you want one new; the Monoprice Monolith 13 THX Ultra is discontinued, so only look for it used.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Rythmik FV15HP | Monoprice Monolith 13 THX Ultra | |
|---|---|---|
| Price | $1,770 | $1,700 Discontinued |
| Ranked | #48 of 110 in Large Home Subwoofers (Over 75 lbs) | #56 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 12.5 Hz | 92.8 dB | 94.0 dB |
| Output SPL at 15 Hz | 105.1 dB | 109.1 dB |
| Output SPL at 20 Hz | 111.1 dB | 115.0 dB |
| Output SPL at 25 Hz | 116.1 dB | 118.0 dB |
| Output SPL at 31.5 Hz | 120.0 dB | 119.5 dB |
| Output SPL at 40 Hz | 122.5 dB | 120.3 dB |
| Output SPL at 50 Hz | 122.1 dB | 120.7 dB |
| Output SPL at 63 Hz | 121.8 dB | 121.4 dB |
| Output SPL at 80 Hz | 121.4 dB | 122.1 dB |
| Output SPL at 100 Hz | 121.2 dB | 122.7 dB |
| Output SPL at 125 Hz | 121.1 dB | 123.8 dB |
| CEA-2010-A Average (40-80Hz) | 122.0 dB | 121.1 dB |
| Dimensions | 24.5”H x 18.2”W x 24.2”D (622.3 x 463.5 x 615.9 mm) | 23.8”H x 20.3”W x 29.1”D (604.5 x 515.6 x 739.1 mm) |
| Weight | 115.1 lbs (52.2 kg) | 153.2 lbs (69.5 kg) |
| Warranty | 5/3 | 5 |
| Cabinet Color | black, white | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Drivers | 15” (381mm) driver | 13” (330mm) driver |
| Inputs | XLR (2), RCA (line/LFE) | XLR (stereo balanced), RCA (stereo/mono) |
| XLR Input | Yes | Yes |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
| Discontinued | - | Yes |
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Prices on this page were last checked September 26, 2026 at 11:14 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
Rythmik FV15HP: $1,770 Rythmik Audio eBay
Pros: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more.
Cons: Premium price ($2127), ported design room gain dependency, and mid-to-large 52 kg footprint.
Full Rythmik FV15HP review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 122.0 dB |
| Cabinet Color | black, white |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 24.5”H x 18.2”W x 24.2”D (622.3 x 463.5 x 615.9 mm) |
| Drivers | 15” (381mm) driver |
| Enclosure | ported, front |
| HDMI Input | No |
| Inputs | XLR (2), RCA (line/LFE) |
| Measurement Source | Audioholics |
| Optical Input | No |
| Output SPL at 12.5 Hz | 92.8 dB |
| Output SPL at 15 Hz | 105.1 dB |
| Output SPL at 20 Hz | 111.1 dB |
| Output SPL at 25 Hz | 116.1 dB |
| Output SPL at 31.5 Hz | 120.0 dB |
| Output SPL at 40 Hz | 122.5 dB |
| Output SPL at 50 Hz | 122.1 dB |
| Output SPL at 63 Hz | 121.8 dB |
| Output SPL at 80 Hz | 121.4 dB |
| Output SPL at 100 Hz | 121.2 dB |
| Output SPL at 125 Hz | 121.1 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5/3 |
| Weight | 115.1 lbs (52.2 kg) |
| XLR Input | Yes |
- 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
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- Rythmik FV15HP vs SVS PB-4000
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Monoprice Monolith 13 THX Ultra: $1,700 Discontinued eBay
Pros: Independent CEA-2010 testing records 115.0 dB at 20 Hz and 121.1 dB through 40-80 Hz. The ported, front enclosure with 13” (330mm) driver has the headroom for demanding film bass in a large room.
Cons: The 604.5H x 515.6W x 739.1D mm cabinet and 69.5 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential. Discontinued.
Notes: Product # 41496
Full Monoprice Monolith 13 THX Ultra review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 121.1 dB |
| Cabinet Color | black |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 23.8”H x 20.3”W x 29.1”D (604.5 x 515.6 x 739.1 mm) |
| Discontinued | Yes |
| Drivers | 13” (330mm) driver |
| Enclosure | ported, front |
| HDMI Input | No |
| Inputs | XLR (stereo balanced), RCA (stereo/mono) |
| Measurement Source | Audioholics |
| Optical Input | No |
| Output SPL at 12.5 Hz | 94.0 dB |
| Output SPL at 15 Hz | 109.1 dB |
| Output SPL at 20 Hz | 115.0 dB |
| Output SPL at 25 Hz | 118.0 dB |
| Output SPL at 31.5 Hz | 119.5 dB |
| Output SPL at 40 Hz | 120.3 dB |
| Output SPL at 50 Hz | 120.7 dB |
| Output SPL at 63 Hz | 121.4 dB |
| Output SPL at 80 Hz | 122.1 dB |
| Output SPL at 100 Hz | 122.7 dB |
| Output SPL at 125 Hz | 123.8 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5 |
| Weight | 153.2 lbs (69.5 kg) |
| XLR Input | Yes |
- 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 13 THX Ultra vs SVS PB16-Ultra
- Monoprice Monolith 13 THX Ultra vs Arendal 1723 Subwoofer 2V
- Monoprice Monolith 13 THX Ultra vs HSU Research VTF-3 MK5 HP
- Monoprice Monolith 13 THX Ultra vs HSU Research VTF-15H MK2
- Monoprice Monolith 13 THX Ultra vs SVS PB17-Ultra R-Evolution
- Monoprice Monolith 13 THX Ultra vs Monoprice Monolith 16 THX Ultra
- Monoprice Monolith 13 THX Ultra vs JTR Speakers Captivator S2