Short answer: the JTR Speakers Growler (2015). It ranks #13 of 110 subwoofers by sound quality at $2995; the Monoprice Monolith M-215 ranks #23 and costs $2999.99, which makes this an easy call rather than a real tradeoff.
What the JTR Speakers Growler (2015) offers: 12-inch ported driver reaches 130.2dB CEA-2010-A average, nearly matching the class leader for about $1,000 less. Watch for: Ported design room interaction, 45 kg size, and $2,995 cost.
What the Monoprice Monolith M-215 offers: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers has the headroom for demanding film bass in a large room. Watch for: The 1074.4H x 508.0W x 701.0D mm cabinet and 98.0 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 JTR Speakers Growler (2015). It ranks higher for sound quality than the Monoprice Monolith M-215 and costs less, so the other one has nothing left to offer.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| JTR Speakers Growler (2015) | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $2995 Passive | $2999.99 |
| Ranked | #13 of 110 in Large Home Subwoofers (Over 75 lbs) | #23 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Passive | Yes | - |
| Output SPL at 20 Hz | 92.8 dB | 118.9 dB |
| Output SPL at 25 Hz | 97.2 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 106.6 dB | 125.2 dB |
| Output SPL at 40 Hz | 122.7 dB | 126.4 dB |
| Output SPL at 50 Hz | 130.0 dB | 126.1 dB |
| Output SPL at 63 Hz | 133.6 dB | 125.6 dB |
| Output SPL at 80 Hz | 134.4 dB | 125.6 dB |
| Output SPL at 100 Hz | 135.5 dB | 125.7 dB |
| Output SPL at 125 Hz | 136.0 dB | 126.3 dB |
| CEA-2010-A Average (40-80Hz) | 130.2 dB | 125.9 dB |
| Dimensions | 22.5"H x 30"W x 20"D (571.5 x 762.0 x 508.0 mm) | 42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm) |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Weight | 100.1 lbs (45.4 kg) | 216.1 lbs (98.0 kg) |
| Drivers | 12" (305mm) driver | 2x 15" (381mm) drivers |
| Output SPL at 12.5 Hz | - | 103.9 dB |
| Output SPL at 15 Hz | - | 113.1 dB |
| Warranty | - | 5 |
| Cabinet Color | - | black |
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- JTR Speakers Captivator S2 vs JTR Speakers Growler (2015)
- JTR Speakers Growler (2015) vs Funk Audio Ultra 24.0
- Danley Sound Labs DTS10 vs JTR Speakers Growler (2015)
Prices on this page were last checked September 16, 2026 at 12:41 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
JTR Speakers Growler (2015): $2995 Passive eBay
Pros: 12-inch ported driver reaches 130.2dB CEA-2010-A average, nearly matching the class leader for about $1,000 less.
Cons: Ported design room interaction, 45 kg size, and $2,995 cost.
Notes: Looks like “PA sub”
Full JTR Speakers Growler (2015) review and specifications →
| CEA-2010-A Average (40-80Hz) | 130.2 dB |
|---|---|
| Country | United States |
| Dimensions | 22.5"H x 30"W x 20"D (571.5 x 762.0 x 508.0 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 20 Hz | 92.8 dB |
| Output SPL at 25 Hz | 97.2 dB |
| Output SPL at 31.5 Hz | 106.6 dB |
| Output SPL at 40 Hz | 122.7 dB |
| Output SPL at 50 Hz | 130.0 dB |
| Output SPL at 63 Hz | 133.6 dB |
| Output SPL at 80 Hz | 134.4 dB |
| Output SPL at 100 Hz | 135.5 dB |
| Output SPL at 125 Hz | 136.0 dB |
| Passive | Yes |
| Weight | 100.1 lbs (45.4 kg) |
- Reviews, Comparisons and Sound Samples
- Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- JTR Speakers Growler (2015) vs Danley Sound Labs DTS10
- JTR Speakers Growler (2015) vs Harbinger V2218S
- JTR Speakers Growler (2015) vs Funk Audio Ultra 24.0
- JTR Speakers Growler (2015) vs Funk Audio Classic 18.0
- JTR Speakers Growler (2015) vs JTR Speakers Captivator S2
- JTR Speakers Growler (2015) vs Monoprice Monolith 16 THX Ultra
- JTR Speakers Growler (2015) vs Reaction Audio PV-15X
- JTR Speakers Growler (2015) vs Pro Audio Technology LFC-24sm
- See all 22 comparisons
Monoprice Monolith M-215: $2999.99 Monoprice eBay
Pros: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers has the headroom for demanding film bass in a large room.
Cons: The 1074.4H x 508.0W x 701.0D mm cabinet and 98.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Notes: Product # 38543
Full Monoprice Monolith M-215 review and specifications →
| CEA-2010-A Average (40-80Hz) | 125.9 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm) |
| Drivers | 2x 15" (381mm) drivers |
| Enclosure | ported, front |
| Measurement Source | Brent Butterworth |
| Output SPL at 12.5 Hz | 103.9 dB |
| Output SPL at 15 Hz | 113.1 dB |
| Output SPL at 20 Hz | 118.9 dB |
| Output SPL at 25 Hz | 122.6 dB |
| Output SPL at 31.5 Hz | 125.2 dB |
| Output SPL at 40 Hz | 126.4 dB |
| Output SPL at 50 Hz | 126.1 dB |
| Output SPL at 63 Hz | 125.6 dB |
| Output SPL at 80 Hz | 125.6 dB |
| Output SPL at 100 Hz | 125.7 dB |
| Output SPL at 125 Hz | 126.3 dB |
| Warranty | 5 |
| Weight | 216.1 lbs (98.0 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
- Monoprice Monolith M-215 vs Rythmik FV25HP
- Monoprice Monolith M-215 vs Reaction Audio PV-15X
- Monoprice Monolith M-215 vs XTZ Sound SUB 3X12
- Monoprice Monolith M-215 vs Monoprice Monolith 16 THX Ultra
- Monoprice Monolith M-215 vs JTR Speakers Captivator 1400
- Monoprice Monolith M-215 vs Funk Audio Classic 18.0
- Monoprice Monolith M-215 vs Harbinger V2218S
- Monoprice Monolith M-215 vs Funk Audio Ultra 24.0
- See all 25 comparisons