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Boston Acoustics CS Sub10 II

100 Watt 10" Downfiring DCD Subwoofer

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  • Adding a Subwoofer to Your Home Theater



Offering exceptional sound at an affordable price, the Boston Acoustics CS Sub10 II 10-Inch Down-Firing Subwoofer is an ideal addition to your home theater or music system. This subwoofer is equipped with superior audio technologies to ensure exceptional bass reproduction. BassTrac circuitry eliminates low-frequency distortion, while graphite-injected woofers deliver more bass response from less amplifier power. 

Subwoofer Provides Powerful Bass
With the CS Sub10 II Down-Firing Subwoofer, you can enjoy your favorite music and movies with thick, resonant bass playback. It features a traditional square cabinet with optimal acoustic engineering that helps radiate bass throughout your room. Pair the subwoofer with other speakers from the Classic II series to create an expansive, cinematic soundstage. 

Audio Technologies Deliver Stunning Performance
The CS Sub10 II is outfitted with Boston Acoustics' best audio technologies. The speaker incorporates Boston's Deep Channel Design: the polymer woofers are injected with graphite, allowing them to produce a more resonant bass sound without bottoming out. The subwoofer also features Boston's BassTrac circuitry, which helps reduce low-frequency distortion even at high output levels. 

Smart Design Enhances Audio Experience
The CS Sub10 II also incorporates other smart audio-enhancing features. The speaker wires are equipped with five-way gold-plated binding posts, which ensure a secure and reliable wire connection. The gold plates also help preserve signal transfer, minimizing frequency losses and gaps. Additionally, the speaker features MagnaGuard magnetic shielding, which helps prevent video interference when it is placed close to your screen. 

Easy Installation
The Sub10 II is designed for a quick and flexible installation. The speaker features a stout, rectangular design and can be placed on the floor or a shelf. In addition, the speaker's wires are extra pliable, making it easier to position it wherever you choose. 

Stylish Wooden Finish
The Sub10 II matches its exceptional audio quality with equally exceptional style. The speaker boasts two finish options; each complements a variety of furniture styles. It also features a traditional box cabinet, giving it a classic, balanced aesthetic. 

The Goal of the Classic II Series
Boston's Classic II Series was designed to offer consumers an affordable, entry-level speaker solution without sacrificing sound quality. The series continues Boston's tradition of creating stylish, high-performance box speakers. 

Boston Acoustics creates all of its speakers following a smart approach to product design--sensible, useful, smart design features combined with contemporary styling. The Classic II series is no exception: each speaker in the series has been engineered using Boston's finest technologies to deliver outstanding performance. 

The CS Sub10 II 10-Inch Down-Firing Subwoofer is backed by a five-year manufacturer's warranty. 

What's in the Box
Sub10 II Down-Firing Subwoofer, owner's manual, and registration card.

  • Subwoofer delivers tight, powerful bass
  • Deep Channel Design woofers produce deep, resonant bass
  • Patented BassTrac circuitry reduces fuzziness and distortion
  • MagnaGuard shielding prevents video interference
  • Five-year warranty


Frequency Range (±3dB)

35 – 150 Hz
Bass Driver
10” (254mm) DCD
Amplifier Power
100 watts RMS; BassTrac® circuitry eliminates distortion
89dB [SPL/2.8V at 1m]
Dimensions (H x W x D)
16 x 15 x 15”
26 lbs 


System Bass-reflex
Orientation Down-firing
Amplifier Power (RMS) 100 Watts
Amplifier type Class D
Frequency Response +/-3dB 35-150 Hz
Max in-room SPL No
Impedance na
Driver Size 10-inch
Woofer 10” graphite polymer
Port Yes
Passive radiator(s) No
Speaker Level Inputs Yes
Speaker level inputs Binding post
Speaker level outputs Binding posts
Line level input(s) RCA LFE
Line level output(s) No
Balanced inputs No
Phase control 0/180 switch
LP Crossover Frequencies 40-180 Hz
LP Crossover Type Variable
Wireless No
Height (inches) 16"
Width (inches) 15"
Depth (inches) 15"
Enclosure MDF
Grille Plastic
Weight (lbs) 26 lbs
Color Black


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