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  LV12R Direct Servo subwoofer
12" rear vented HT sub

Performance & Specifications

A quick glance at our frequency response plot will reveal that our LV12R subwoofers has a flat frequency response down to 19hz with bass extension controls set to low. This subwoofer is designed to use with the bass management in an AV receiver with LFE input. When LFE input is used, the phase and cross-over knobs have no function.

sealed response

Fig 1.0 - LV12R Frequency response chart with LFE input and extension switch set to low

Alternatively, one can also use line inputs with both phase and crossover knobs in function. The frequency response is as follows.

sealed response

Fig 1.1 - LV12R Frequency response chart with Line input and extension switch set to low


This subwoofer is designed to use with the bass management in an AV receiver. With many subwoofers, it is difficult to get a correct and seamless integration with the main speakers because the amplifier settings are often very different to the measured response. You may set the crossover point to 80 Hz, but the actual crossover point may be anywhere between 60 and 100 Hz! The crossover control knob on our plate amplifier can serve as a fine tuning tool to reduce the overlap in output between the main speakers and the subwoofer. The sub has 3 extension settings for 3 different frequency response contours. Low extension setting also employs low damping to give a more full-body bass sound. High extension setting, on the other hand, employs high damping to give a more articulate bass sound.

sealed response

Fig 1.1 - LV12R Frequency response chart with 3 different extension settings

Another aspect of getting a correct integration is phase alignment. We have written a guide on how to achieve a phase aligned subwoofer. More >

Extension filter settings to match your room

Vented subwoofers do have more phase delay at the low end frequency spectrum. That combined with poor room acoustics sometimes produces boomy bass sound. We have variable extension frequency and damping settings to address that. Customers should experiment with extension filter settings. Low extension setting is recommended for HT use whereas high extension setting (24hz, Q=0.8) is recommend for music.

Driver 12" driver with custom sensing coil
Driver materials Paper cone with rubber surround
  Aluminum cast frame basket
  Copper flux de-modulation shorting rings
Amplifier 300WRMS Hypex class D module with patented servo controlled
Dimensions 16 (W) "x 22" (H) x19" (D) (20-1/2" D with grille and amplifier knobs)
Shipping Weight 69lbs
Frequency Response 19 - 300 Hz(+/-2db) with LFE ; 19-100(+/-2db) with Line-in
Crossover slope 12db/octave only
Crossover range (Low pass) 40 - 120 Hz (Line level frequency response top out at 100hz)
Rumble Filter (High pass ) built-in 12db/oct at 20hz to limit subsonic cone excursion
Phase adjustment 0 - 180 degrees continuously variable
Bass extension settings Low (19hz,Q=1.1), med (22hz,Q=0.9), and high(24hz, Q=0.8)
Finishes Available in black matte vinyl or black oak vinyl

5 years warranty on driver and 3 years on amplifier
(warranty does not cover abuse)

  45 day satisfaction guarantee