Monoprice
Monolith by Monoprice M-12 V2
$849.99Cheaper
Best Subwoofers · head-to-head
Monolith by Monoprice M-12 V2 vs REL T/9x
A sourced, side-by-side comparison. Monolith by Monoprice M-12 V2 is cheaper at $849.99. Every spec and price links to its source.
REL Acoustics
REL T/9x
$1699
Which is better: the Monolith by Monoprice M-12 V2 or REL T/9x?
The REL T/9x wins 1 of the 1 specs we compare head to head; the other wins 0. The Monolith by Monoprice M-12 V2 is the cheaper at $849.99. Get the REL T/9x for the stronger spec sheet, the Monolith by Monoprice M-12 V2 to spend less.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Monolith by Monoprice M-12 V2 | REL T/9x |
|---|---|---|
| US price | $849.99 | $1699 |
| Brand | Monoprice | REL Acoustics |
| Released | — | — |
| Driver size (in) | 12 | 10 |
| Amplifier power rms (W) | 500 | 300 |
| Amplifier power peak (W) | — | — |
| Enclosure type | ported | passive-radiator |
| Frequency response (Hz) | 17-200 | — |
| Amplifier class | class-d | class-ab |
| Driver orientation | — | front-firing |
| Room correction | No | No |
| Wireless input | No | Yes |
| Dimensions (in) | 25.8 x 16.7 x 22.8 | 13.4 x 14.5 x 15.5 |
| Weight (lb) | 98.34 | 45.5 |
Sources — Monolith by Monoprice M-12 V2: monoprice.com (verified 2026-07-11). REL T/9x: rel.net (verified 2026-07-11).
What's the difference between the Monolith by Monoprice M-12 V2 and REL T/9x?
Where the two actually differ on the specs we track (7 of 11). Matching specs are omitted.
- Driver size (in): Monolith by Monoprice M-12 V2 12 vs REL T/9x 10
- Amplifier power rms (W): Monolith by Monoprice M-12 V2 500 vs REL T/9x 300
- Enclosure type: Monolith by Monoprice M-12 V2 ported vs REL T/9x passive-radiator
- Amplifier class: Monolith by Monoprice M-12 V2 class-d vs REL T/9x class-ab
- Wireless input: Monolith by Monoprice M-12 V2 false vs REL T/9x true
- Dimensions (in): Monolith by Monoprice M-12 V2 25.8 x 16.7 x 22.8 vs REL T/9x 13.4 x 14.5 x 15.5
- Weight (lb): Monolith by Monoprice M-12 V2 98.34 vs REL T/9x 45.5