Short answer: the Monoprice SW-15. It ranks #14 of 212 subwoofers by sound quality (rated 4.1/5) at $499.99 and is still sold new; the Klipsch HD Theater 600 ranks #35 (rated 3.3/5) and is discontinued, so it is only an option used.
Buy the Monoprice SW-15. It is rated higher for sound quality, and the Klipsch HD Theater 600 is discontinued, so it is only available used.
Still deciding? The full Subwoofers rankings cover every ranked option.
Prices on this page were last checked November 7, 2026 at 7:34 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Klipsch HD Theater 600 | Monoprice SW-15 | |
|---|---|---|
| Price | $399 Discontinued | $499.99 |
| Ranked | #35 of 73 in Small Home Subwoofers (Under 30 lbs) | #14 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, rear | ported, bottom |
| Output SPL at 25 Hz | 87.1 dB | 106.3 dB |
| Output SPL at 31.5 Hz | 98.4 dB | 111.2 dB |
| Output SPL at 40 Hz | 104.9 dB | 116.0 dB |
| Output SPL at 50 Hz | 107.6 dB | 120.2 dB |
| Output SPL at 63 Hz | 112.1 dB | 120.5 dB |
| CEA-2010-A Average (40-80Hz) | 108.2 dB (avg of 3/4 bands) | 119.0 dB |
| Dimensions | 13.9”H x 12.5”W x 12.5”D (353.1 x 317.5 x 317.5 mm) | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Audioholics |
| Weight | 17 lbs (7.7 kg) | 66.1 lbs (30.0 kg) |
| Drivers | 8” (203mm) driver | 15” (381mm) driver |
| Output SPL at 15 Hz | - | 90.0 dB |
| Output SPL at 20 Hz | - | 101.2 dB |
| Output SPL at 80 Hz | - | 119.5 dB |
| Warranty | - | 1 |
| Cabinet Color | - | black |
| Frequency Response | - | 30-150Hz (-10dB) |
| Amplifier Power | - | 600W RMS / 800W peak |
| Crossover Frequency | - | 40-150Hz, 18dB/octave |
| Phase Control | - | 0° or 180° |
| Inputs | - | Stereo line level and speaker level |
Related Speaker Comparisons
More worthwhile head-to-heads for Monoprice SW-15: