A
NTI
-M
ODE
8033C
INEMA
2.2. Calibration
Press both the LIFT and BYPASS buttons on the front panel and hold them down to start the
calibration process. Make sure that both of the buttons are pressed down at the same time.
After a couple of seconds the LIFT25 LED starts flashing and calibration begins. Now
release the buttons and wait for the automatic calibration to finish. The measurement
program analyzes the room utilizing four to six frequency sweeps.
The calibration starts with a moderate output volume. The measurement routine allows wide
range of input levels. The input level warning LED (BYPASS LED) starts to flicker if less than
3.0 dB of headroom is left during measurement. If this persists, the generated output level is
adjusted down. If the microphone is near overflow, the sweep is also restarted.
The calibration process is very robust and it tolerates background noise very well, therefore
speech and small noises do not affect the process. However, one should avoid making loud
noises, especially near the microphone. For example, tapping the microphone or its cable
can overflow the microphone input, causing the calibration process to restart.
Tip: Tapping the microphone with a finger is an easy way to test the microphone, you will see
the BYPASS LED flicker. A harder tap will drop the level or restart the calibration process.
If you initiate the calibration process by mistake, you can abort it by pressing either the LIFT
or BYPASS buttons. This will restore your saved settings, including the lift settings.
Calibration is automatically aborted after one sweep if the microphone is not connected
properly, is faulty, or the calibration signal is not detected (for example, the subwoofer is not
turned on). The previously saved settings are restored in this case.
2.3. After Calibration
Once the last sweep is over, the calibration process is finished. The subsonic filter is
automatically activated. The results are stored in the non-volatile memory inside the unit so
they are not lost if the Anti-Mode loses power. The Anti-Mode 8033 is now fully functional and
the microphone can be detached, unless the user wishes to perform Wider Area Calibration.
After calibration the subwoofer may sound more quiet. This is partly because the overall
sound level has dropped when the room resonances have been suppressed, and in part, it
just sounds more quiet, because you have been used to peaks in the audio output. It may
take a while to get accustomed to the new sound but you quickly start to notice sounds on
frequencies that were drowned out by the untreated peaks. The calibration process raises
the overall level, so the subwoofer volume needs to be increased only slightly (1-6 dB). For
best results perform this adjustment using the AVR's subwoofer volume control.
If the AVR supports speaker distances, you can add 90 cm (~36 inches) to the subwoofer
distance relative to other speakers to compensate for the internal processing delay. This is
not absolutely necessary since the delay is small enough that the human auditory system
generally cannot detect it.
You can also use your AVR's automatic calibration functions to determine the correct
distance and level settings. In this case, the processing latency of the Anti-Mode and the
new subwoofer level is automatically taken into account by the AVR and you do not need to
adjust them yourself. Use the AVR's “small” speaker setting best results. First calibrate the
Anti-Mode, then perform the AVR calibration so it sees the corrected response.
Whenever the placement of the subwoofer or listening position changes, the initial calibration
should be performed again to insure an optimal result.
Rev. 1.9
2012-03-20
Page 6 (12)
