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Sunfire SDS-12

Powered subwoofer

3 Reviews

Item # 877SDS12

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Our take on the Sunfire SDS-12

Get more from your music and movies

No matter what your favorite entertainment sources may be, the Sunfire SDS-12 will add impressive depth and excitement to them all. This potent powered subwoofer can faithfully re-create the delicate acoustic bass line from a classic bluegrass ballad, then turn around and deliver a room-rattling crash of thunder on a movie soundtrack. Its high-efficiency, 300-watt Sunfire amplifier and custom-built 12" woofer team up to give you rich, low-distortion sound.

Sunfire SDS-12 bottom view

The Sunfire SDS-12's custom-built 12" driver and down-firing passive radiator combine to deliver impressive low-end clout.

Moving some serious air

Much of the SDS-12's powerful performance comes courtesy of its Sunfire-designed, long-throw 12" woofer and acoustically matched 12" down-firing passive radiator. The woofer's extremely long excursion displaces large amounts of air to produce the deepest bass. The passive radiator reinforces the woofer, producing output most often achieved only with much larger cabinets.

Brute force with intelligence and grace

The SDS-12 uses a cool-running 300-watt Class D amplifier with sophisticated circuitry that keeps the power coming on strong when needed, but consumes a mere 0.5 watts when in standby mode. Sunfire's proprietary Frequency Filtration Design™ (FFD) technology helps maintain musicality and accuracy, even at the highest volumes and lowest frequencies. The amp's soft-clipping circuitry also keeps the woofer from being dangerously overdriven or producing obvious distortion, without squashing the dynamic subtleties or compromising its thunderous impact during big action flicks.

Easy system integration

Line-level inputs and outputs let you easily connect this sub to most audio system. Its back-panel volume, crossover, and phase controls help you fine-tune the bass to your liking. The sub includes four conical feet that reduce surface contact area to decrease the amount of vibrations transmitted to the floor. The SDS-12 makes an excellent addition to just about any a stereo music or home theater setup.

Product Highlights:

  • frequency response: 28-150 Hz
  • built-in Class D amplifier delivers 300 watts of continuous power, 600 watts peak power
  • Frequency Filtration Design™ (FFD) technology allows high output levels with low distortion
  • 12" poly-coated fiber cone woofer
  • down-firing 12" passive radiator
  • bass-reflex (passive radiator) enclosure
  • continuously variable low-pass 30-150 Hz crossover
  • continuously variable phase control (0-180°)
  • rear-mounted volume, crossover, and phase control
  • auto on/off
  • gold-plated line-level inputs and outputs
  • LFE input for use with home theater receiver's subwoofer output
  • vibration-reducing conical feet
  • black ash vinyl finish
  • 14-5/8"W x 16-11/16"H x 15-9/16"D
  • weight: 35 lbs.
  • warranty: 3 years
  • Our 60-day money-back guarantee

What's in the Box:

  • Powered subwoofer
  • 6' AC power cord
  • Grille
  • Quick Start Guide
  • Warranty Informamtion

awesome!!! this thing hits hard. I use it for listening to music and have it connected to my 2 channel integrated amp.



Sunfire SDS-12 Reviews

Average Customer Review(s):

(3 Reviews)


Anonymous from WASHINGTON on 7/24/2017

awesome!!! this thing hits hard. I use it for listening to music and have it connected to my 2 channel integrated amp.

Pros: was easy to connect great control control to dial in to your liking. plenty of power

Cons: cant come up with any

Love this Sub!

Spazmo from Leavenworth, KS on 4/22/2016

This replaced my old subwoofer and I could not be happier! It hits the low frequencies perfectly.

Pros: The footprint is very reasonable.Fantastic for both music and movies.I recommend this to anyone!

Cons: None

Nice sound from a small foot print

Anonymous from Colorado on 12/6/2015

Crutchfield Customer Review (What's this?)

We were looking for a true surround sound system and well, now I have it. If your in the mood to clearly hear and feel the what your watching, this little sub woofer allows you to do so. If you could have seen my wife face when I finally turned the gain up, you wouldn't pass on this sub in you house. Just make sre you don't have neighbors near by

Pros: Love that you can feel the movies. Small foot print for a powerful sub

Cons: Haven't found any yet


Hands-on research

Features and Specs

Enclosure Passive Radiator
Video Shielded No
Woofer Size (inches) 12
Woofer Composition Poly
Firing Direction Front/Down
Wireless No
Preamp-Level Inputs Yes
Speaker-Level Inputs No
Speaker-Level Outputs No
Low-Pass Crossover Freq 50-150Hz
High-Pass Crossover Freq 85Hz
Phase Switch Yes
Amplifier Output (watts) 300
Frequency Response 30-150 Hz
Height (inches) 16-9/16
Width (inches) 14-13/16
Depth (inches) 16-5/8
Weight 35 lbs
Speaker Parts Warranty 3 Years
Speaker Labor Warranty 3 Years
Amplifier Parts Warranty 3 Years
Amplifier Labor Warranty 3 Years

Product Research


Passive Radiator Design: A front firing, 12" custom Sunfire driver is acoustically matched to an 12" down-firing passive radiator, creating nearly double the output compared to conventional single-driver designs.

250W Amp w/ Soft Clipping Circuit: Sunfire's digital amplifier delivers 300W or RMS output and 600W of Peak output. A compressor circuit kicks in automatically if the input signal level reaches a level that would overload the driver. This maintains a ceiling on the output without clipping. If the input signal is driven even further, a Soft Clipping circuit is enabled to prevent driver damage.

Controls: Controls for adjusting the volume, crossover frequency and phase, allow the subwoofer to be perfectly matched to any listening environment and audio components.

  • Level: This control lets you match the output level of the subwoofer to the level of your other speakers. The subwoofer output will increase as this control is rotated clockwise.
  • Crossover: This control changes the high frequency cutoff point. With the control set to 150 Hz, the subwoofer will reproduce frequencies up to 150 Hz. If the control is set fully clockwise, the crossover is bypassed and the subwoofer will reproduce a wide frequency range. With the control fully counter-clock wise the subwoofer reproduces a narrow range, up to 50 Hz. Rotate the control until the bass sounds natural. If the mid-bass sounds natural but you want more low bass, turn this control down a little, then turn the Volume control up by about the same amount. This increases the low-bass output while leaving the mid-bass output the same.
  • Phase: This control changes the relative phase (0°-180°) of the subwoofer with respect to the other speakers. Use this control to help blend the subwoofer with the rest of the sys tem. This is accomplished by adjusting the control in small increments as you listen for the most bass at your listening position. As a final adjustment, readjust the Crossover Frequency and Volume controls after the Phase has been set.

Connections: The Sunfire SDS-12 powered sub is fitted with RCA inputs and outputs.

  • LFE/RCA Inputs: Connect these unbalanced inputs with RCA-type patch cords to the line-level outputs of your receiver or preamp. If your preamplifier or receiver has a single sub/LFE output, connect it to Left RCA input jack.
  • Line-Level Outputs: These stereo RCA output jacks are a copy of the signals going into the powered sub's inputs, except the bass has been removed by a fixed high-pass crossover circuit (85Hz). The output is not affected by the subwoofer's controls.

Auto Turn-On/Standby: The powered subwoofer has a special power circuit which automatically turns the powered subwoofer on when a signal is fed to the loudspeaker and turns it off when there is no signal present (approximately 15 minutes).

Placement: Although low frequencies are non-directional, factors such as room reflections, standing waves, resonance and absorption will strongly affect your subwoofer's performance. Moving the subwoofer from one location to another can have a major effect on the bass response. The Sunfire SDS-12 powered subwoofer is designed to be placed in a corner for optimum performance.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

This subwoofer is used with my Thiel speakers to handle the low end bass. [ DANNY V  May 14, 2017 ]