Polk Audio Monitor XT12 Powered Subwoofer 12 Inch
- Driver Size: 12 inches
- Power: 100 watts
- Connectivity: RCA
- Brand Tech: Polk Audio
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A 12-inch, 100W floor-standing subwoofer for filling out bass in a receiver-based home theater setup.
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ASIN: B09BMX6GPTModel: MXT12Category: Subwoofers
Overview
A 100-watt powered subwoofer with a 12-inch driver, built for floor placement in black. It connects via RCA and measures 16 x 18 x 16 inches at 39 lb.
The 12-inch driver and 100W power rating put this in Polk's mid-size subwoofer range, sized for floor-standing placement rather than a bookshelf or under-desk spot. RCA is the only connectivity listed, so it pairs with a receiver or amp that has a subwoofer output.
- 12 in driver
- 100W power
- RCA connectivity
- 39 lb, floor standing
Who it's for
Fits a home theater setup adding low-end bass to a speaker system through an AV receiver's RCA subwoofer output. Not for a setup that needs wireless subwoofer connectivity.
Pros and cons
- 12 inch driver for low-end output
- 100W power rating
- RCA only, no wireless connectivity
- 39 lb, fixed floor placement rather than portable
Performance notes
The 12-inch driver and 100W power rating are sized for floor-standing placement, with RCA as the sole wired connection back to a receiver or amp's subwoofer output.
Specifications
| Brand | Polk Audio |
|---|---|
| Model | MXT12 |
| Dimensions & fit | |
| Driver Size | 12 incheshigher than 55% of 32 subwoofers |
| Weight | 39 poundshigher than 74% of 35 subwoofers |
| Dimensions | 16 × 18 × 16 inches |
| Dimensions | 16 x 18 x 16 in |
| Power & efficiency | |
| Power | 100 wattslower than 86% of 23 subwoofers |
| Construction & materials | |
| Color | Black |
| Compatibility & installation | |
| Connectivity | RCA |
| Mounting | Floor Standing |
| Other details | |
| Brand Tech | Polk Audio |
| Speaker Type | Subwoofer |
Closest rivals on specs
BIC America H-100II Powered Subwoofer 12 Inch- Power 100 vs 300 watts (-67%)
Klipsch S 810 Subwoofer- Power 100 vs 150 watts (-33%)
- Driver Size 12 vs 10 inches (+20%)
- Weight 39 vs 29.3 pounds (+33%)
Dayton Audio IOSUB IP66 Outdoor Subwoofer 10 Inch- Power 100 vs 150 watts (-33%)
- Driver Size 12 vs 10 inches (+20%)
- Weight 39 vs 28.2 pounds (+38%)
Frequently asked questions
What size driver does the Polk Audio MXT12 use?
A 12-inch driver.
How is it powered and connected?
It is a 100W powered subwoofer connecting via RCA.
Is it meant for floor or shelf placement?
It is designed for floor-standing placement.