Monoprice

Monoprice 44516 CSW-12 - 12" 400W Compact Subwoofer

5.0 (1 reviews)
400W

A 12-inch 400-watt powered subwoofer that delivers deep, impactful bass from a surprisingly compact ported enclosure.

$423.96*
In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Monoprice CSW-12 is a 12-inch powered subwoofer built to add serious low-frequency impact to home theaters, media rooms, and music setups without dominating your floor space. Its 400-watt internal amplifier drives the large woofer with enough authority to pressurize a room, reproducing the deep rumble of movie soundtracks and the low-end punch of bass-heavy music with ease. The ported enclosure design enhances low-frequency output and efficiency, allowing the sub to reach deeper than a sealed enclosure of the same size while keeping the cabinet dimensions compact.

Connection versatility is a practical strength of the CSW-12. The inclusion of both RCA and high-level speaker inputs means it works with dedicated subwoofer outputs on modern receivers as well as older amplifiers that lack a sub-out connection. The adjustable crossover lets you set the upper frequency limit of the subwoofer to match your main speakers, while the phase control ensures tight timing alignment so the bass sounds cohesive rather than detached. For anyone seeking big bass performance on a reasonable budget, the CSW-12 hits a compelling balance between output, size, and price.

Key Features

12" Driver

400W Amplifier

Compact Enclosure

RCA and High-Level Speaker Inputs

Phase Control and Crossover Setting

Specifications

Driver Size
12 inches
Amplifier Power
400 Watts
Enclosure Type
Compact, Ported
Inputs
RCA and High-Level Speaker Inputs
Controls
Phase Control, Crossover Setting
Model
44516 (CSW-12)

Pros & Cons

👍 Pros

  • 400-watt built-in amplifier produces powerful, room-filling bass
  • 12-inch driver reaches low frequencies that smaller subwoofers cannot match
  • Compact ported enclosure saves floor space compared to similarly sized drivers
  • Both RCA and high-level speaker inputs provide flexible connection options
  • Phase control and crossover adjustment allow precise blending with existing speakers

👎 Cons

  • A 12-inch powered sub still has noticeable physical presence despite the compact design
  • Weight of the unit may make repositioning it for optimal placement cumbersome
  • Ported design can produce port noise at very high volume levels
  • No wireless connectivity — requires a physical cable run to the audio source

Frequently Asked Questions

It includes both RCA line-level inputs and high-level speaker inputs, so it can connect to a wide range of receivers, amplifiers, and soundbars.
It has a built-in 400-watt amplifier, so no external amplification is needed — just connect it to your audio source and a power outlet.
Yes, the CSW-12 includes a variable crossover control and a phase switch, allowing you to blend its output smoothly with your main speakers.
Monoprice designed the CSW-12 with a compact ported enclosure that takes up less floor space than many competing 12-inch subwoofers while still delivering deep bass output.