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 REL Acoustics T-7 ranks #139 (rated 3.6/5) and is discontinued, so it is only an option used. The REL Acoustics T-7’s replacement, the REL Acoustics T/7x, is rated 3.6/5 at $1,199.
The Monoprice SW-15 is the better-sounding pick. A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room. Watch for: Budget-tier design, ported room gain dependency, 66.1 lbs (30 kg) mid-size, and limited dynamic headroom.
Why pick the REL Acoustics T-7: A compact 8 inch subwoofer with a passive radiator and REL’s speaker level connection, aimed at music systems. Watch for: Output drops to 93.9dB at 25Hz and 74.0dB at 20Hz, so it adds little below about 30Hz and is rated only to 30Hz at -6dB.
Buy the Monoprice SW-15. It is rated higher for sound quality; the REL Acoustics T-7 is no longer sold new.
Looking for alternatives? See the complete Subwoofers rankings.
A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room.
A compact 8 inch subwoofer with a passive radiator and REL’s speaker level connection, aimed at music systems.
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Specifications Side By Side
| Monoprice SW-15 | REL Acoustics T-7 | |
|---|---|---|
| Price | $499.99 | $699 Discontinued |
| Ranked | #14 of 212 in Medium Home Subwoofers (30-75 lbs) | #139 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | passive radiator |
| Output SPL at 15 Hz | 90.0 dB | - |
| Output SPL at 20 Hz | 101.2 dB | 74.0 dB |
| Output SPL at 25 Hz | 106.3 dB | 93.9 dB |
| Output SPL at 31.5 Hz | 111.2 dB | 104.9 dB |
| Output SPL at 40 Hz | 116.0 dB | 111.9 dB |
| Output SPL at 50 Hz | 120.2 dB | 113.3 dB |
| Output SPL at 63 Hz | 120.5 dB | 111.5 dB |
| Output SPL at 80 Hz | 119.5 dB | - |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 112.2 dB (avg of 3/4 bands) |
| Dimensions | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) | 13.7”H x 12”W x 13.7”D (349.2 x 304.8 x 349.2 mm) |
| Weight | 66.1 lbs (30.0 kg) | 31.1 lbs (14.1 kg) |
| Warranty | 1 | 3 |
| Cabinet Color | black | - |
| Country | United States | United Kingdom |
| Measurement Source | Audioholics | Brent Butterworth |
| Frequency Response | 30-150Hz (-10dB) | 30Hz -6dB |
| Amplifier Power | 600W RMS / 800W peak | 200W RMS |
| Crossover Frequency | 40-150Hz, 18dB/octave | - |
| Phase Control | 0° or 180° | - |
| Inputs | Stereo line level and speaker level | - |
| Drivers | 15” (381mm) driver | 8” (203mm) driver |
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