Powered subwoofer (Dark Cherry)

  • THIEL USS SmartSub®


  • THIEL USS SmartSub®

    Angled view

  • THIEL USS SmartSub®


  • THIEL USS SmartSub®

    Woofer driver

Item #: 684USSDC

Review Summary

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Our take on the THIEL USS SmartSub®

by Dave Bar

Why add a powered subwoofer?

A powered subwoofer gives you bass you can feel as well as hear. Our customers love the depth and impact their subs add to music and movies. We hear comments like "it brings out sounds I didn't know existed in discs I've watched a million times." Powered subwoofers aren't just for big bass that rattles your picture frames; they can also deliver tight, accurate lows. If you haven't shopped for a powered sub in a while, you might be surprised at how small they get. Look for an ultra-compact model if you want to tuck your sub away under an end table or in a corner.

Experience a new "low" in listening

It's hard to beat THIEL speakers for their pinpoint accuracy and clarity. Same for their subs. THIEL's USS SmartSub® delivers dynamic, low-distortion bass that pairs up perfectly with THIEL speakers, as well as other high-quality speaker systems. Its powerful 550-watt amplifier easily drives the front-firing 10" woofer — giving you deep, room-shaking low frequency effects from your favorite movies and clear, musical bass with your favorite tunes. The potent USS uses THIEL's exclusive SmartSub® technology to ensure exceptional performance, no matter where you place it in the room. Unlike traditional subs, it doesn't have a built-in crossover — so be sure to connect it to your home theater receiver's dedicated LFE (Low Frequency Effects) output, or use it with the THIEL PX05 passive crossover for full bass reproduction in an all-THIEL speaker system.

Precision engineering for awe-inspiring bass


A massive aluminum cone woofer delivers deep, punchy bass.

The woofer consists of a rigid aluminum driver and a heavy cast aluminum chassis. This solidly constructed driver maintains the proper shape as it moves, for crystal-clear sound reproduction, even when you crank up the volume. A motor structure consisting of a short, 6-layer voice coil sitting inside a large, double-stacked magnet effortlessly drives the woofer. Unlike the voice coils found in most speakers that extend outside the magnet, the deliberately short voice coil always "sees" the optimum magnetic field as it travels back and forth. This eliminates distortion caused by variances in magnetic strength. Unique electronic circuitry is also used to correct for compression distortion due to heating of the voice coil for more dynamic and effortless performance under heavy loads. It all adds up to thunderous bass that's fast, detailed, and articulate.

Rear panel

Advanced controls on the back of the sub make it easy to compensate for nearby walls, ensuring better bass response.

Smooth bass response — no matter where you put the sub

Placing any subwoofer against the wall or in a corner will produce uneven bass response due to dips and peaks at certain frequencies. THIEL ingeniously solved this problem with patented room-correction circuitry. Simply use the controls on the back of the sub to dial in the distance to the rear wall and nearest side wall, and the sub automatically calibrates itself to correct for boundary problems. You'll hear smooth and balanced bass no matter where you put the sub in your room. Best of all — the USS does this compensation without microphones, equalizers, or complicated measurements.


  • 550-watt RMS amplifier
  • 10" front-firing driver
  • line-level input frequency response: 10-300 Hz (±3dB)
  • LFE input frequency response: 16-300 (±3dB)
  • acoustic output: up to 99dB @ 20Hz, 106dB @ 30Hz
  • input sensitivity: 1 volt for 120dB @ 1 meter
  • SmartRoom filter eliminates room boundary problems for extremely balanced and smooth bass reproduction
  • inputs: 1 unfiltered LFE RCA and 1 line-level XLR
  • outputs: 1 RCA and 1 XLR
  • short coil/long gap driver design eliminates distortion caused by variances in magnetic strength
  • electronic circuitry corrects for compression distortion due to heating of the voice coil for more dynamic and effortless bass reproduction
  • real wood veneer finish
  • 11"W x 20"H x 15-1/2"D
  • weight: 55 lbs.
  • warranty: 10 years
  • Our 60-day money-back guarantee
  • Note: No built-in crossover — must be used with a receiver with an LFE output or the THIEL PX05 5-channel sub crossover
Preliminary info from the manufacturer
Features and Specs
Acoustic Suspension
Video Shielded
Woofer Size (inches)
Woofer Composition
Firing Direction
Preamp-Level Inputs
Speaker-Level Inputs
Speaker-Level Outputs
Low-Pass Crossover Freq
High-Pass Crossover Freq
Phase Switch
Amplifier Output (watts)
Frequency Response
10-300 Hz
Height (inches)
Width (inches)
Depth (inches)
Speaker Parts Warranty
10 Years
Speaker Labor Warranty
10 Years
Amplifier Parts Warranty
Amplifier Labor Warranty
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THIEL USS SmartSub® Reviews

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5 out of 5


Written By Kumaravel, San Jose, CA 95117 on Saturday, July 27, 2013
Crutchfield Customer Review (What's this?)
Thiel's SS2 SmartSub is very innovative and great sounding subwoofer. Playing deep bass seems to be its forte, and it settings for where you place subwoofer in your room helping to blend with the main electro static Mageplanar speakers. Our room was live when saw Pirates of the Caribean. It is worth every penny spent.
Able to adjust speaker distance from wall
It took almost 100+ hours for speaker breakin
1 out of 1 people found this helpful
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Add accessories for the THIEL USS SmartSub®

Use a high-quality subwoofer cable for bass that draws you into your movies and music. A cable is not included with this sub. See all categories & accessories

Monster Cable® 600sw Subwoofer cable (4 meters/13.2 feet)
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Monster Core Power® 650 USB Space-saving surge protector with built-in USB charging (White)
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Monster Core Power® 600 USB Surge protector with built-in USB charging
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Monster Core Power® 350 USB Space-saving surge protector with built-in USB charging (White)
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Monster Core Power® 1200 USB Surge protector with built-in USB charging
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For a more in-depth review and enhanced detailed information on the THIEL USS SmartSub®, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_684USSDC/THIEL-USS-SmartSub-Dark-Cherry.html ).