Clef Head Logo  

Anti-Mode 8033


A typical listening room resonates in low frequencies. Because of this, even the best subwoofer may not sound good enough. Much of the audio content get masked by the resonances, introducing unwanted characteristics (such as "slowness" and "boominess") to the sound. This problem is most pronounced when subwoofer is placed close to walls or corners of the room.

The Golden Ear awarded Anti-Mode™ technology eliminates the resonances of the speaker and the room by equalizing both amplitude and time domain responses using very accurate digital signal processing filter structures and anti-phasing technology. This way, the listener can hear frequencies down to the cut-off frequency of the subwoofer. Transient response is also drastically improved in the process, making bass sound faster and more controlled.

Anti-Mode™ 8033 is very simple to use. The calibration process is completely automatic: it generates frequency sweeps to the desired calibration point (or multiple points) and measures the combined transfer function of the subwoofer-room system.

Anti-Mode™ 8033 uses regular RCA connectors, which can be found from vast majority of home theater equipment. Input to the device is taken from the line level subwoofer output of the (pre-)amplifier. Output is connected to the line level input of the subwoofer.



  • Measures and corrects the combined frequency response of your subwoofer system and the listening room
  • User-friendly automatic calibration procedure
  • Can be used with any active subwoofer
  • Minimum phase filtering, no significant algorithm delay
  • Correction range 16-144 Hz
  • Three user-selectable additional equalization filters
  • Single or multiple measurement point calibration
  • Measurement microphone is included
  • Ultra-compact enclosure: 126 mm x 80 mm x 28 mm (5" x 3.2"  x 1.1")
  • Low power consumption: 1.5 W
  • RoHS directive compliant



Technical Specification

Electrical characteristics:
Power consumption:   1.2 W
Input sensitivity:   Line level (1.0Vrms nominal, 1.75Vrms max)
Amplification:   3.0 dB (bypass)
Operation voltage:   9 VAC or 12 VDC
Low-pass (analog):   Bessel 12 dB/octave, Q ~ 0.5, fc = 250 Hz
Frequency range (-3 dB):   5 – 160 Hz
Dynamic ratio (unweighted):   > 90 dB

Firmware features:
Frequency resolution:  < 0.5 Hz
Maximum attenuation:   96 dB
Filter Q-value range:   Unlimited (32-bit integer space)
Sub-sonic filter:   10 Hz (user-selectable)
Computation accuracy:   32 / 40-bit integer
Latency:   2.7 ms
Anti-Mode-Filters:   28
Correction range:   16 – 160 Hz
Lift filters:  20Hz, 30Hz