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Sunfire SDS-8

Compact powered subwoofer

2 Reviews

Item # 877SDS8

Out of Stock

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Our take on the Sunfire SDS-8

Satisfy your cravings for high-energy bass with the Sunfire SDS-8 powered subwoofer. This sub's high-efficiency, 200-watt Sunfire amplifier and custom-built 8" woofer deliver accurate, low-distortion performance that adds excitement to your movies, music, and video games. Plus, its compact design takes up surprisingly little space, so you get big bass impact without the visual impact of a large enclosure.

Big bass without taking up a lot of space

Satisfy your cravings for high-energy bass with the Sunfire SDS-8 powered subwoofer. This sub's high-efficiency, 200-watt Sunfire amplifier and custom-built 8" woofer deliver accurate, low-distortion performance that adds excitement to your movies, music, and video games. Plus, its compact design takes up surprisingly little space, so you get big bass impact without the visual impact of a large enclosure.

Sunfire SDS-8 bottom view

The Sunfire SDS-8's custom-built 8" driver and down-firing passive radiator combine to deliver impressive low-end clout.

Moving some serious air

Much of the SDS-8's powerful performance comes courtesy of its Sunfire-designed, long-throw 8" woofer and acoustically matched 8" 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-8 uses a cool-running 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 impact during big action flicks.

Easy system integration

Line-level inputs and outputs let you easily connect this sub to most audio systems. 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-8 makes an excellent addition to just about any stereo music or home theater setup.

What's in the Box:

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

Product Highlights:

  • frequency response: 32-150 Hz
  • built-in Class D amplifier delivers 200 watts of continuous power, 400 watts peak power
  • Frequency Filtration Design™ (FFD) technology allows high output levels with low distortion
  • 8" poly-coated fiber cone woofer
  • down-firing 8" 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
  • line-level inputs and outputs
  • LFE input for use with home theater receiver's subwoofer output
  • vibration-reducing conical feet
  • black ash vinyl finish
  • 13-3/4"W x 11-3/4"H x 12-1/2"D
  • weight: 20 lbs.
  • warranty: 3 years
  • Our 60-day money-back guarantee

Sunfire SDS-8 Reviews

Average Customer Review(s):

(2 Reviews)

Awesome, clean and compact bass

Jonathan from Thornton, CO on 6/18/2016

Crutchfield Customer Review (What's this?)

I was looking for a small, high quality subwoofer in a sealed / radiator design to match a set of Martin Logan Motions which left a short list. This SDS 8 by Sunfire fit the bill - great sound, great appearance, quiet operation with tight and impressive bass. The knobs and switches seem top notch, and I like that the AC cord is detachable. The rubber feet work really well - the unit stays put even when going full tilt. By happenstance my brother in law has the 10" version which is equally impressive for the price (I think you would have to spend several hundred dollars more to gain any real improvement over the SDS series.) I'msurprised there aren't more reviews listed here.

Pros: Small Attractive design Radiator/ Sealed means no reflex port huffing and puffing

Cons: None!

Added Punch!

Knoxtiger from Knoxville, TN on 9/29/2014

Crutchfield Customer Review (What's this?)

I needed a good, musical sub to add some punch for a relatively small listening room. I had a larger sub for home theater but it was a little too boomy. I also wanted a high pass filter since my components are all somewhat older and do not have a sub out. I pass the pre-amp out to the sub and then back out to the amp. Works perfectly and lessens the load on the amp. I got the tight punch and needed with a small footprint. Exactly what I was looking for.

Pros: Tight, punchy bass. Not boomy at all. Small footprint. Pre-amp ins and outs so it works well with older seperates. Sounds great right out of the box.

Cons: Not really any. Doesn't go as low as larger subs but because of small footprint shouldn't be expected to.


Hands-on research

Features and Specs

Enclosure Passive Radiator
Video Shielded No
Woofer Size (inches) 8
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) 200
Frequency Response 32-150 Hz
Height (inches) 13-9/16
Width (inches) 11-3/4
Depth (inches) 14-9/16
Weight 20 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, 8" custom Sunfire driver is acoustically matched to an 8" down-firing passive radiator, creating nearly double the output compared to conventional single-driver designs.

200W Amp w/ Soft Clipping Circuit: Sunfire's digital amplifier delivers 200W or RMS output and 400W 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-8 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-8 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?

I have a tiny kitchen and would love to have enhanced bass while leaving more amp power to my measley SONY STR DH-700 A/V reciever. This should give me more musical fidelity with my pair of bi-amped B&W bookshelf speakers. [ MR.  Jan 02, 2017 ]

Looking for more? Check out the next model in this lineup.

SunFire SDS10

Sunfire SDS-10

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Want even more powerful lows?

The Sunfire SDS-10 sports a 10" woofer and 250-watt amp for more bass output.