Short answer: the MartinLogan Dynamo 1600X on measured sound quality, the JBL SUB 550P on price. The MartinLogan Dynamo 1600X ranks #2 of 145 subwoofers at $1606.77. The JBL SUB 550P ranks #141 at $600, $1006.77 cheaper.
What the MartinLogan Dynamo 1600X offers: Sealed 15-inch with 900W RMS, 1800W peak delivers forceful clean tight low bass. Easily configurable as forward-firing or down-firing. Smartphone app with Anthem Room Correction (ARC) optimizes bass across room. Wireless capable with optional SWT-X module. Watch for: Ported design room integration needs, mid-range 121.5 dB output, and $1,607 price.
What the JBL SUB 550P offers: 10-inch sealed with 300W RMS delivers low distortion realistic bass compared to cheaper options. Deep bass response similar to larger 12” models. Multiple line-level inputs and adjustable crossover control. Watch for: No detailed measurement caveats are currently recorded.
Buy the MartinLogan Dynamo 1600X if sound quality is the priority over the price, or the JBL SUB 550P if the price is the priority over sound quality.
If sound quality matters at all to you, skip the JBL SUB 550P. It ranks near the bottom of the 145 subwoofers, so look higher up the list instead.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| MartinLogan Dynamo 1600X | JBL SUB 550P | |
|---|---|---|
| Price | $1,606.77 | $600 |
| Ranked | #2 of 145 in Medium Home Subwoofers (30-75 lbs) | #141 of 145 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | sealed | sealed |
| Output SPL at 15 Hz | 86.2 dB | - |
| Output SPL at 20 Hz | 99.4 dB | 84.7 dB |
| Output SPL at 25 Hz | 103.9 dB | 89.8 dB |
| Output SPL at 31.5 Hz | 111.7 dB | 98.1 dB |
| Output SPL at 40 Hz | 118.4 dB | 101.5 dB |
| Output SPL at 50 Hz | 121.0 dB | 103.2 dB |
| Output SPL at 63 Hz | 121.8 dB | 103.3 dB |
| Output SPL at 80 Hz | 121.0 dB | 103.7 dB |
| Output SPL at 100 Hz | 120.2 dB | 104.2 dB |
| Output SPL at 125 Hz | 119.0 dB | - |
| CEA-2010-A Average (40-80Hz) | 120.5 dB | 102.9 dB |
| Dimensions | 20.1"H x 17.9"W x 19.1"D (510.5 x 454.7 x 485.1 mm) | 17.5"H x 14.9"W x 15"D (444 x 379 x 380 mm) |
| Weight | 56 lbs (25.4 kg) | 50 lbs (22.7 kg) |
| Warranty | 3 | 1 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | ErinsAudioCorner |
| Frequency Response | 20-200Hz, ±3dB | 27-150Hz |
| Amplifier Power | 900W RMS / 1800W peak | 300W RMS |
| Inputs | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) | - |
| Drivers | 15" (381mm) driver | 10" (254mm) driver |
Related Speaker Comparisons
More worthwhile head-to-heads for MartinLogan Dynamo 1600X:
- JTR Speakers Captivator 212PRO vs MartinLogan Dynamo 1600X
- HSU Research ULS-15 MK2 vs MartinLogan Dynamo 1600X
- MartinLogan Dynamo 1600X vs Monoprice SW-12
- MartinLogan Dynamo 1600X vs Power Sound Audio (PSA) XV15
- MartinLogan Dynamo 1600X vs Paradigm Defiance X12
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
MartinLogan Dynamo 1600X: $1,606.77 eBay
Pros: Sealed 15-inch with 900W RMS, 1800W peak delivers forceful clean tight low bass. Easily configurable as forward-firing or down-firing. Smartphone app with Anthem Room Correction (ARC) optimizes bass across room. Wireless capable with optional SWT-X module.
Cons: Ported design room integration needs, mid-range 121.5 dB output, and $1,607 price.
Full MartinLogan Dynamo 1600X review and specifications →
| Amplifier Power | 900W RMS / 1800W peak |
|---|---|
| CEA-2010-A Average (40-80Hz) | 120.5 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 20.1"H x 17.9"W x 19.1"D (510.5 x 454.7 x 485.1 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | sealed |
| Frequency Response | 20-200Hz, ±3dB |
| Inputs | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 86.2 dB |
| Output SPL at 20 Hz | 99.4 dB |
| Output SPL at 25 Hz | 103.9 dB |
| Output SPL at 31.5 Hz | 111.7 dB |
| Output SPL at 40 Hz | 118.4 dB |
| Output SPL at 50 Hz | 121.0 dB |
| Output SPL at 63 Hz | 121.8 dB |
| Output SPL at 80 Hz | 121.0 dB |
| Output SPL at 100 Hz | 120.2 dB |
| Output SPL at 125 Hz | 119.0 dB |
| Warranty | 3 |
| Weight | 56 lbs (25.4 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
- MartinLogan Dynamo 1600X vs HSU Research ULS-15 MK2
- MartinLogan Dynamo 1600X vs JTR Speakers Captivator 212PRO
- MartinLogan Dynamo 1600X vs Monoprice SW-12
- MartinLogan Dynamo 1600X vs Power Sound Audio (PSA) XV15
- MartinLogan Dynamo 1600X vs Paradigm Defiance X12
- MartinLogan Dynamo 1600X vs Power Sound Audio (PSA) XV15-BASE
- MartinLogan Dynamo 1600X vs Power Sound Audio (PSA) XV15SEICE-BASE
- MartinLogan Dynamo 1600X vs Monoprice SW-15
- See all 48 comparisons
JBL SUB 550P: $600 eBay
Pros: 10-inch sealed with 300W RMS delivers low distortion realistic bass compared to cheaper options. Deep bass response similar to larger 12” models. Multiple line-level inputs and adjustable crossover control.
Full JBL SUB 550P review and specifications →
| Amplifier Power | 300W RMS |
|---|---|
| CEA-2010-A Average (40-80Hz) | 102.9 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 17.5"H x 14.9"W x 15"D (444 x 379 x 380 mm) |
| Drivers | 10" (254mm) driver |
| Enclosure | sealed |
| Frequency Response | 27-150Hz |
| Measurement Source | ErinsAudioCorner |
| Output SPL at 20 Hz | 84.7 dB |
| Output SPL at 25 Hz | 89.8 dB |
| Output SPL at 31.5 Hz | 98.1 dB |
| Output SPL at 40 Hz | 101.5 dB |
| Output SPL at 50 Hz | 103.2 dB |
| Output SPL at 63 Hz | 103.3 dB |
| Output SPL at 80 Hz | 103.7 dB |
| Output SPL at 100 Hz | 104.2 dB |
| Warranty | 1 |
| Weight | 50 lbs (22.7 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by ErinsAudioCorner; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons