Short answer: the REL Acoustics T/5x. It ranks #151 of 212 subwoofers by sound quality, rated 3.5/5, at $699; the Monoprice Monolith M-10 V2 ranks #161, rated 3.4/5, and costs $753.97, so there is not much of a tradeoff to weigh.
What the REL Acoustics T/5x does well: Compact sealed enclosure with a down-firing 8-inch long-throw FibreAlloy driver powered by a 125W Class A/B amplifier. The tradeoff: Single 8-inch sealed driver rolls off below 32Hz (-6dB) and provides limited headroom for visceral home theater low-frequency effects in medium to large rooms.
Why pick the Monoprice Monolith M-10 V2: 10-inch THX-certified ported with 500W RMS reaches 17-20Hz.
Buy the REL Acoustics T/5x. It is rated higher for sound quality than the Monoprice Monolith M-10 V2 and costs less, which makes it the one to get unless you need something the other one does better.
About the ratings: the REL Acoustics T/5x’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 3.3 to 3.7, 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 T/5x | Monoprice Monolith M-10 V2 | |
|---|---|---|
| Price | $699.00 | $753.97 |
| Ranked | #151 of 212 in Medium Home Subwoofers (30-75 lbs) Estimated | #161 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Country | United Kingdom | United States |
| Warranty | 3 | 5 |
| Enclosure | sealed | ported, front |
| Drivers | 8” (200mm) down-firing long-throw FibreAlloy cone | 10” (254mm) driver |
| Amplifier Power | 125W RMS (Class A/B) | 500W RMS |
| Frequency Response | 32Hz at -6dB (manufacturer specified) | 17-20Hz |
| Dimensions | 11.8”H x 12.1”W x 12.3”D (300 x 307 x 313 mm) | 20.9”H x 15”W x 18.9”D (530.9 x 381.0 x 480.1 mm) |
| Weight | 31.5 lbs (14.3 kg) | 72.5 lbs (32.9 kg) |
| Output SPL at 15 Hz | - | 93.9 dB |
| Output SPL at 20 Hz | - | 104.8 dB |
| Output SPL at 25 Hz | - | 108.5 dB |
| Output SPL at 31.5 Hz | - | 109.3 dB |
| Output SPL at 40 Hz | - | 109.7 dB |
| Output SPL at 50 Hz | - | 110.1 dB |
| Output SPL at 63 Hz | - | 110.6 dB |
| Output SPL at 80 Hz | - | 110.9 dB |
| Output SPL at 100 Hz | - | 111.2 dB |
| Output SPL at 125 Hz | - | 111.5 dB |
| CEA-2010-A Average (40-80Hz) | - | 110.3 dB |
| Cabinet Color | - | black |
| Measurement Source | - | Manufacturer |
| Inputs | - | XLR, RCA, XLR passthrough out |
| XLR Input | - | Yes |
| RCA Input | - | Yes |
| TRS Input | - | No |
| Optical Input | - | No |
| Coaxial Input | - | No |
| USB Input | - | No |
| HDMI Input | - | No |
| AES Input | - | No |
| Aux Input | - | No |
Related Speaker Comparisons
How REL Acoustics T/5x compares with other leading options:
- Klipsch RP-1000SW vs REL Acoustics T/5x
- ELAC Varro PS250 vs REL Acoustics T/5x
- ELAC Varro PS250 vs Monoprice Monolith M-10 V2
- Monoprice Monolith M-10 V2 vs SVS SB-2000 Pro
- Monoprice Monolith M-10 V2 vs BK Electronics XLS200-DF MK2
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 T/5x: $699.00 Estimated Amazon eBay
Same family: the REL Acoustics T/7x (larger subwoofer, ranked higher, estimated 3.6/5) and the REL Acoustics T/9x (larger subwoofer, ranked higher, estimated 3.9/5). See every REL T Series generation.
Pros: Compact sealed enclosure with a down-firing 8-inch long-throw FibreAlloy driver powered by a 125W Class A/B amplifier. Includes REL signature high-level Neutrik Speakon input alongside RCA/LFE inputs for seamless stereo music integration.
Cons: Single 8-inch sealed driver rolls off below 32Hz (-6dB) and provides limited headroom for visceral home theater low-frequency effects in medium to large rooms. Lacks onboard app control or parametric EQ.
Full REL Acoustics T/5x review and specifications →
| Released | Apr 2021 (5 years ago) |
|---|---|
| Amplifier Power | 125W RMS (Class A/B) |
| Country | United Kingdom |
| Dimensions | 11.8”H x 12.1”W x 12.3”D (300 x 307 x 313 mm) |
| Drivers | 8” (200mm) down-firing long-throw FibreAlloy cone |
| Enclosure | sealed |
| Frequency Response | 32Hz at -6dB (manufacturer specified) |
| Warranty | 3 |
| Weight | 31.5 lbs (14.3 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
Monoprice Monolith M-10 V2: $753.97 Amazon eBay
Older model: the Monoprice Monolith 10 THX Select (ranked higher, rated 3.6/5). See every Monoprice Monolith generation.
Same family: the Monoprice Monolith M-12 V2 (larger subwoofer, rated 3.8/5) and the Monoprice Monolith M-15 V2 (larger subwoofer, rated 4.2/5).
Pros: 10-inch THX-certified ported with 500W RMS reaches 17-20Hz. HDF cabinet eliminates resonance-induced coloration. Extended EQ and THX EQ modes for flexibility. Low distortion output. Best for rooms under 2500 cubic feet. Exceptional budget value at $754.
Notes: Product # 42843
Full Monoprice Monolith M-10 V2 review and specifications →
| Released | Nov 2021 (4 years ago) |
|---|---|
| AES Input | No |
| Amplifier Power | 500W RMS |
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 110.3 dB |
| Cabinet Color | black |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 20.9”H x 15”W x 18.9”D (530.9 x 381.0 x 480.1 mm) |
| Drivers | 10” (254mm) driver |
| Enclosure | ported, front |
| Frequency Response | 17-20Hz |
| HDMI Input | No |
| Inputs | XLR, RCA, XLR passthrough out |
| Measurement Source | Manufacturer |
| Optical Input | No |
| Output SPL at 15 Hz | 93.9 dB |
| Output SPL at 20 Hz | 104.8 dB |
| Output SPL at 25 Hz | 108.5 dB |
| Output SPL at 31.5 Hz | 109.3 dB |
| Output SPL at 40 Hz | 109.7 dB |
| Output SPL at 50 Hz | 110.1 dB |
| Output SPL at 63 Hz | 110.6 dB |
| Output SPL at 80 Hz | 110.9 dB |
| Output SPL at 100 Hz | 111.2 dB |
| Output SPL at 125 Hz | 111.5 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5 |
| Weight | 72.5 lbs (32.9 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
- Monoprice Monolith M-10 V2 vs ELAC Varro PS250
- Monoprice Monolith M-10 V2 vs Klipsch R-121SW
- Monoprice Monolith M-10 V2 vs BK Electronics XLS200-DF MK2
- Monoprice Monolith M-10 V2 vs RSL (Rogersound Labs) Speedwoofer 10S MKII
- Monoprice Monolith M-10 V2 vs KEF KC62
- Monoprice Monolith M-10 V2 vs Monoprice SSW-10
- Monoprice Monolith M-10 V2 vs SVS SB-2000 Pro
- Monoprice Monolith M-10 V2 vs SVS PB-1000 PRO
- See all 19 comparisons