* Free UPS ground shipping to any continental US address
* Discounts when purchasing dual subs
* Discounts when sub is purchased with our speakers

Budget Level High Performance

This budget level sub delivers the same articulate and tuneful bass that our subs are known for and yet provides enough performance for demanding music and home theater thanks to its sealed design in combination with Direct Servo. 


100% MONEY




Looking for an affordable musical subwoofer that can be also used for moderate home theater use? The L12 uses our proprietary servo design to gain low frequency clarity and articulation. For home theater use, L12 has a HT playback mode with rumble filter to limit less audible sub-sonic contents.

While many of our competitors limit their best technology (such as servo) to their top level models, we wanted to make Direct Servo affordable, so we've held nothing back. As a result, you get the tight and music bass you wouldn't normally expect from a subwoofer at this price range. L12 is likely the least expensive servo subwoofer on the market.

Integration guide



Features & Options

Product features include:

  • Patented Direct Servo technology
  • 12" light weight cone low inertia high excursion driver
  • Solid and very inert enclosure available in a range of finishing options
  • Bass extension controls allowing adjustment of bass extension and excursion control
  • Selectable 12/24 db/octave crossover filter slope
  • 120V-240V switchable power

Direct Servo technology

All our subwoofers feature our Direct Servo technology, which is our secret to achieving tight and accurate bass. The benefits are far more than simply achieving low distortion.

Direct Servo closed loop technology

Learn more in our technology articles >

12" paper cone high excursion drivers


Driver features include:

  • Low moving mass paper cone and rubber surround to ensure an exceptional transient response
  • Large magnet for high flux density in the gap to ensure low distortion
  • Flux de-modulation shorting rings to lower inductance and improve linearity

Quality enclosure

Our enclosures are very solid and well braced to minimize any cabinet resonance or coloration. The enclosure is heavily braced and the sub has a net weight of 53 lbs.

We also provide a range of finishes. Our range of attractive and excellent value vinyl finishes including:

  • black matte veneer
  • black oak veneer

Bass extension controls

L12 features a unique bass extension control, shown below.

The bass extension control enables the user to customize the frequency response of the low end for the best trade-off between output and extension. If set to low music, bass has the lowest extension. The damping factor of this mode is 0.5 for the best time domain response. However, the disadvantage is slower attenuation of subsonic signals. For HT application, we recommend low-HT mode which incorporates a 3rd order highpass filter to filter out subsonic signals below 20hz. High extension setting is recommended for application where longer playback time and lower power consumption is required.

Crossover options

To suit different setups, we provide a 12 db and 24 db/octave crossover (as shown in the above photo) with adjustable range from 30hz to 120hz.

RCA inputs

120V-240 Switchable Voltage Selection

Correct voltage must be selected before use. Voltage switch is shown below.

voltage selection



The bass extension switch allows the user to customize the deep bass extension and the rumble filter to control cone excursion. For HT application, one can set the extension to Low-HT or High for higher SPL output. For music one may prefer a lower cut off such as Low-Music setting. Changing the settings can also result in a better integration with the acoustic gain of the room.

Driver 12" high excursion with custom sensing coil
Driver materials paper cone with lightweight rubbersurround
  Aluminum flux de-modulation shorting rings
Amplifier 300WRMS class D (dual Hypex Ucd modules) patented servo controlled
Dimensions 14"(W) x 14" (H )x 15-1/2" (D) with grille and amplifier knobs
Shipping Weight 58 lbs
Frequency Response 18 - 100 Hz (-3 dB @ 18Hz, -6db@12hz) LINE-IN, 18-200hz LFE IN
  12 - 120 Hz (+/-3db) LINE-IN, 12-250hz LFE IN
Crossover slope Selectable 12 or 24 dB / octave
Crossover range (Low pass) 30 - 120 Hz
Rumble Filter (High pass ) 20 Hz 18 dB / octave
Phase response 110 degrees phase shift at 20 Hz with LOW MUSIC mode
Phase adjustment 0 - 180 degrees continuously variable
Bass damping factor Low music (Q=0.5), Low-HT(Q=0.9), and high (Q=0.8)
Standy power 7W (standby, red light), 13W(ON,green light)
Finishes Available in black matte vinyl or black oak vinyl
Warranty 5 years warranty on driver and 3 years on electronics
  45 day satisfaction guarantee.
  Customers pay only one way return shipping in case of return



In the chart below, with bass extension controls set to Low Music, the response is 3 db down at 18Hz. The red and blue lines are the amplitude and phase response, respectively. The phase shift as only 120 degrees. But in reality the microphone itself has 18 degrees of phase shift at 20hz. Therefore L12 only has 102 degrees phase at 20hz.

sealed response

L12 features bass extension switch allowing users to select among 3 different modes: Low Music (Q=0.5), Low HT (with a 18db/oct rumble filter at 20hz), and High (with 18db/oct bass extension at 28hz). Below is the frequency and phase response of Low HT mode. Note that the phase response (blue line) below 10hz is noisy because the response level is significantly down below 10hz.

sealed response

The comparison of all 3 modes with LINE-IN is shown below

L12 accepts a pair of LINE-IN and one LFE IN. The LFE input mode extends the upper end response to 200hz.


L12 provides a 12/24 db/oct switchable low pass filter to so that it can easily integrate with any front speakers.

Another aspect of getting a correct integration is phase alignment between the front speakers and the sub. We have written a guide on how to achieve a phase aligned subwoofer. L12 has a phase/delay adjustment knob. More >



These are some of the finest subwoofers ever manufactured and the difference in sound quality between these subwoofers and the typical big-box ported subwoofer is surprising. You will hear the difference the very first time you listen and as so many have said, you will never go back to a non-servo subwoofer.

Rythmik L12 12" Subwoofer

Just added to your wishlist:
My Wishlist
You've just added this product to the cart:
Go to cart page