Short answer: both are discontinued, so this only matters if you are buying used. Used, the MartinLogan Dynamo 700w is the better pick: it ranks #25 of 73 subwoofers by sound quality (rated 3.4/5), against #35 (rated 3.3/5) for the Klipsch HD Theater 600. If you want one new, the Edifier T5s ranks #2 at $199.99.
Buy the MartinLogan Dynamo 700w only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the Edifier T5s instead.
Still deciding? The full Subwoofers rankings cover every ranked option.
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Specifications Side By Side
| Klipsch HD Theater 600 | MartinLogan Dynamo 700w | |
|---|---|---|
| Price | $399 Discontinued | $999 Discontinued |
| Ranked | #35 of 73 in Small Home Subwoofers (Under 30 lbs) | #25 of 73 in Small Home Subwoofers (Under 30 lbs) |
| Enclosure | ported, rear | sealed |
| Output SPL at 25 Hz | 87.1 dB | 88.4 dB |
| Output SPL at 31.5 Hz | 98.4 dB | 94.6 dB |
| Output SPL at 40 Hz | 104.9 dB | 106.3 dB |
| Output SPL at 50 Hz | 107.6 dB | 110.3 dB |
| Output SPL at 63 Hz | 112.1 dB | 110.5 dB |
| CEA-2010-A Average (40-80Hz) | 108.2 dB (avg of 3/4 bands) | 109.0 dB (avg of 3/4 bands) |
| Dimensions | 13.9”H x 12.5”W x 12.5”D (353.1 x 317.5 x 317.5 mm) | 12.5”H x 11.7”W x 12.5”D (318.5 x 296.9 x 318.3 mm) |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Weight | 17 lbs (7.7 kg) | 26.5 lbs (12.0 kg) |
| Drivers | 8” (203mm) driver | 10” (254mm) driver |
| Output SPL at 20 Hz | - | 86.3 dB |
| Warranty | - | 3 |
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