Short answer: the REL Acoustics Tzero MKIII, if you are buying new, though neither ranks well in its class. The Axiom Audio EP400 v3 ranks higher than it (#46 vs #48 of 48 subwoofers, 2.6/5 vs 2.0/5) but is discontinued, so only consider it used; the REL Acoustics Tzero MKIII is still sold new at $599. Both are rated below 3.0/5 among the 48 subwoofers; for better sound, the Edifier T5s ranks #2 at $199.99.
The case for the Axiom Audio EP400 v3: Independent CEA-2010 testing records 90.0 dB at 20 Hz and 98.5 dB through 40-80 Hz. The tradeoff: Deep-bass output is limited relative to its midbass result, so it is not the right choice for the lowest movie effects.
What the REL Acoustics Tzero MKIII does well: Independent CEA-2010 testing records 89.2 dB through 40-80 Hz. Watch for: Without a published 20 Hz output result, deep-bass capability is less certain than its midbass figure.
Buy the REL Acoustics Tzero MKIII new; the Axiom Audio EP400 v3 is no longer sold new, so it only makes sense as a used find.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| Axiom Audio EP400 v3 | REL Acoustics Tzero MKIII | |
|---|---|---|
| Price | $599 Discontinued | $599.00 |
| Ranked | #46 of 48 in Small Home Subwoofers (Under 30 lbs) | #48 of 48 in Small Home Subwoofers (Under 30 lbs) |
| Enclosure | sealed | sealed |
| Output SPL at 20 Hz | 90.0 dB | - |
| Output SPL at 25 Hz | 94.0 dB | 70.4 dB |
| Output SPL at 31.5 Hz | 97.0 dB | 76.6 dB |
| Output SPL at 40 Hz | 99.0 dB | 83.7 dB |
| Output SPL at 50 Hz | 99.0 dB | 89.7 dB |
| Output SPL at 63 Hz | 98.0 dB | 91.5 dB |
| Output SPL at 80 Hz | 98.0 dB | 92.1 dB |
| Output SPL at 100 Hz | 98.0 dB | 90.8 dB |
| CEA-2010-A Average (40-80Hz) | 98.5 dB | 89.2 dB |
| Dimensions | 13.7”H x 10.5”W x 16.8”D (349.2 x 266.7 x 426.7 mm) | 9.5”H x 8.5”W x 10.5”D (241.3 x 215.9 x 266.7 mm) |
| Warranty | 5 | 3 |
| Country | Canada | United Kingdom |
| Measurement Source | Audioholics | ErinsAudioCorner |
| Weight | 17.9 lbs (8.1 kg) | 15 lbs (6.8 kg) |
| Drivers | 8” (203mm) driver | 6.5” (165mm) driver |
| Inputs | XLR (balanced), RCA (line-level), speaker-level | - |
| 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 | - |
| Cabinet Color | - | black, white |
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Prices on this page were last checked September 30, 2026 at 2:57 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
Axiom Audio EP400 v3: $599 Discontinued eBay
Pros: Independent CEA-2010 testing records 90.0 dB at 20 Hz and 98.5 dB through 40-80 Hz. The sealed enclosure with 8” (203mm) driver is best suited to upper-bass support in a modest room.
Cons: Deep-bass output is limited relative to its midbass result, so it is not the right choice for the lowest movie effects. The 349.2H x 266.7W x 426.7D mm cabinet and 8.1 kg mass still need deliberate placement and calibration. Discontinued.
Full Axiom Audio EP400 v3 review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 98.5 dB |
| Coaxial Input | No |
| Country | Canada |
| Dimensions | 13.7”H x 10.5”W x 16.8”D (349.2 x 266.7 x 426.7 mm) |
| Drivers | 8” (203mm) driver |
| Enclosure | sealed |
| HDMI Input | No |
| Inputs | XLR (balanced), RCA (line-level), speaker-level |
| Measurement Source | Audioholics |
| Optical Input | No |
| Output SPL at 20 Hz | 90.0 dB |
| Output SPL at 25 Hz | 94.0 dB |
| Output SPL at 31.5 Hz | 97.0 dB |
| Output SPL at 40 Hz | 99.0 dB |
| Output SPL at 50 Hz | 99.0 dB |
| Output SPL at 63 Hz | 98.0 dB |
| Output SPL at 80 Hz | 98.0 dB |
| Output SPL at 100 Hz | 98.0 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5 |
| Weight | 17.9 lbs (8.1 kg) |
| XLR Input | Yes |
- Reviews, Comparisons and Sound Samples
- Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
REL Acoustics Tzero MKIII: $599.00 Amazon eBay
Pros: Independent CEA-2010 testing records 89.2 dB through 40-80 Hz. The sealed enclosure with 6.5” (165mm) driver is intended to add useful bass support without a full-size cabinet.
Cons: Without a published 20 Hz output result, deep-bass capability is less certain than its midbass figure. The 241.3H x 215.9W x 266.7D mm cabinet and 6.8 kg mass still need careful placement and calibration.
Full REL Acoustics Tzero MKIII review and specifications →
| CEA-2010-A Average (40-80Hz) | 89.2 dB |
|---|---|
| Cabinet Color | black, white |
| Country | United Kingdom |
| Dimensions | 9.5”H x 8.5”W x 10.5”D (241.3 x 215.9 x 266.7 mm) |
| Drivers | 6.5” (165mm) driver |
| Enclosure | sealed |
| Measurement Source | ErinsAudioCorner |
| Output SPL at 25 Hz | 70.4 dB |
| Output SPL at 31.5 Hz | 76.6 dB |
| Output SPL at 40 Hz | 83.7 dB |
| Output SPL at 50 Hz | 89.7 dB |
| Output SPL at 63 Hz | 91.5 dB |
| Output SPL at 80 Hz | 92.1 dB |
| Output SPL at 100 Hz | 90.8 dB |
| Warranty | 3 |
| Weight | 15 lbs (6.8 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by ErinsAudioCorner; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons