Short answer: the REL Acoustics HT/1205 MKII. It ranks #45 of 212 subwoofers by sound quality, rated 3.9/5, at $899; the Klipsch RP-1200SW ranks #73, rated 3.8/5, and costs $899.99, so there is not much of a tradeoff to weigh.
The case for the REL Acoustics HT/1205 MKII: High-output 12-inch CarbonGlas driver paired with a 500W RMS NextGen5 Class D amplifier in a compact sealed cabinet. The catch: Lacks high-level input connectivity and digital parametric EQ filters.
The case for the Klipsch RP-1200SW: The sweet-spot 12-inch model in Klipsch’s Reference Premiere subwoofer series. Watch for: A heavy, deep enclosure (31.1 kg, 598 mm deep) that demands meaningful floor space.
Buy the REL Acoustics HT/1205 MKII. It is rated higher for sound quality than the Klipsch RP-1200SW and costs less, so only choose the other one for a particular feature it does better.
About the ratings: the REL Acoustics HT/1205 MKII’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 3.7 to 4.1, so this verdict could change once it is measured.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| REL Acoustics HT/1205 MKII | Klipsch RP-1200SW | |
|---|---|---|
| Price | $899.00 | $899.99 each |
| Ranked | #45 of 212 in Medium Home Subwoofers (30-75 lbs) Estimated | #73 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Country | United Kingdom | United States |
| Warranty | 3 | 5 |
| Enclosure | sealed | Ported, front Aerofoil slot port |
| Drivers | 12” (300mm) CarbonGlas cone, inverted carbon fiber dust cap | 12” front-firing Cerametallic high-excursion woofer |
| Amplifier Power | 500W RMS (NextGen5 Class D) | 400W RMS, 800W peak Class D |
| Frequency Response | 22Hz at -6dB (manufacturer specified) | 16.5Hz - 138Hz (+/- 3dB, Manufacturer specified) |
| Dimensions | 16.3”H x 15.2”W x 17.2”D (413 x 387 x 438 mm) | 18.9” x 17” x 23.5” (480 x 432 x 598 mm) |
| Weight | 43.2 lbs (19.6 kg) | 68.6 lbs (31.1 kg) |
| Bass Extension (-3dB) | - | 17Hz (measured, Audioholics) |
| Crossover Frequency | - | 40Hz - 160Hz variable |
| Inputs | - | Dual RCA line-in, WA-2 wireless port |
| Maximum SPL | - | 121dB (in-room) |
| Phase Control | - | 0° / 180° switch |
| RCA Input | - | Yes |
Related Speaker Comparisons
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- Rythmik L12 vs REL Acoustics HT/1205 MKII
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- REL Acoustics HT/1205 MKII vs Polk Audio Signature Elite ES12 Subwoofer
- Klipsch RP-1200SW vs Polk Audio Signature Elite ES12 Subwoofer
- Bose Lifestyle Ultra Subwoofer vs Klipsch RP-1200SW
Prices on this page were last checked October 11, 2026 at 4:59 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.
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The Two Speakers In Full
REL Acoustics HT/1205 MKII: $899.00 Estimated Amazon eBay
Same family: the REL Acoustics HT/1003 MKII (smaller subwoofer, ranked lower, estimated 3.7/5) and the REL Acoustics HT/1510 Predator II (larger subwoofer, rated 4.1/5).
Pros: High-output 12-inch CarbonGlas driver paired with a 500W RMS NextGen5 Class D amplifier in a compact sealed cabinet. Provides deep bass extension down to 22Hz (-6dB) and strong dynamic impact for dedicated cinema setups.
Cons: Lacks high-level input connectivity and digital parametric EQ filters. As a sealed design, infrasonic output below 20Hz trails similarly priced ported alternatives.
Full REL Acoustics HT/1205 MKII review and specifications →
| Released | Oct 2022 (4 years ago) |
|---|---|
| Amplifier Power | 500W RMS (NextGen5 Class D) |
| Country | United Kingdom |
| Dimensions | 16.3”H x 15.2”W x 17.2”D (413 x 387 x 438 mm) |
| Drivers | 12” (300mm) CarbonGlas cone, inverted carbon fiber dust cap |
| Enclosure | sealed |
| Frequency Response | 22Hz at -6dB (manufacturer specified) |
| Warranty | 3 |
| Weight | 43.2 lbs (19.6 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
Klipsch RP-1200SW: $899.99 each Amazon eBay
Same family: the Klipsch RP-1000SW (smaller subwoofer, ranked lower, rated 3.6/5), the Klipsch Reference Premiere RP-1400SW (larger subwoofer, estimated 4/5) and the Klipsch RP-1600SW (larger subwoofer, rated 4.2/5).
Pros: The sweet-spot 12-inch model in Klipsch’s Reference Premiere subwoofer series. Delivers 400W RMS / 800W peak power driving an ultra-long-throw 12-inch front-firing Cerametallic woofer through a front Aerofoil slot port. Audioholics comprehensive CEA-2010 bench testing proved class-leading output across the sub-bass spectrum, producing 105.8dB at 20Hz and over 117dB above 40Hz with remarkably low harmonic distortion. Rivals established internet-direct heavyweights like SVS and Monolith in clean output capability.
Cons: A heavy, deep enclosure (31.1 kg, 598 mm deep) that demands meaningful floor space. Lacks app-based parametric EQ or DSP presets found on competitors like SVS Pro models.
Full Klipsch RP-1200SW review and specifications →
| Released | 2023 (3 years ago) |
|---|---|
| Amplifier Power | 400W RMS, 800W peak Class D |
| Bass Extension (-3dB) | 17Hz (measured, Audioholics) |
| Country | United States |
| Crossover Frequency | 40Hz - 160Hz variable |
| Dimensions | 18.9” x 17” x 23.5” (480 x 432 x 598 mm) |
| Drivers | 12” front-firing Cerametallic high-excursion woofer |
| Enclosure | Ported, front Aerofoil slot port |
| Frequency Response | 16.5Hz - 138Hz (+/- 3dB, Manufacturer specified) |
| Inputs | Dual RCA line-in, WA-2 wireless port |
| Maximum SPL | 121dB (in-room) |
| Phase Control | 0° / 180° switch |
| RCA Input | Yes |
| Warranty | 5 |
| Weight | 68.6 lbs (31.1 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons