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How do I connect the 8033 to my system?
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Connecting 8033 into any system is very straighforward, see the Anti-Mode connection examples here:
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What kind of delay does 8033 introduce and how do I compensate it?
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The 8033 has insignificant delay of 2.7ms which is inaudible at low frequencies. For comparison, the additional delay of room modes can be more than 500ms, which is eliminated by Anti-Mode correction.
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My Lift setting is gone after I unplug the power
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The current Lifting setting (25Hz/35Hz/Flat) can be stored by pressing and holding the "Lift" button for 3 about seconds. A small "beep" sound is played to confirm that the setting was stored. This stored setting will be automatically selected as default when 8033 is powered up.
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How, and in which order do I calibrate the 8033 with AV-receivers own calibration program?
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First calibrate the subwoofer with 8033 to suppress modes and achieve flat frequency response. Then run the calibration program of the AV-receiver so that it can "see" the corrected subwoofer, and obtain the right level, phase (delay) and cross-over frequency for integration with main speakers.
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What should I do about the subwoofer distance setting on AVR
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The distance setting of the AVR is in fact a relative delay setting. The delay consists of three main components: physical inertia, electronic delay and propagation delay. All these delays are visible to the setup program of the AVR. Because of this, the AVR will detect the correct amount of delay in it's setup when using Anti-Mode, and it will automatically compensate for the small delay introduced by the 8033.
If the AVR has no automatic setup, or if for some reason manual approach is preferred, the distance to add into the subwoofers "distance" setting is about 3 feet (0.9m). For example if the distance of the subwoofer was 12 feet before 8033, then it should be set to 15 feet after the 8033 is connected into the signal chain.
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How do I convert the 2 RCA outputs to balanced XLR?
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You simply connect them as follows:
RCA 0-out to XLR pin 2
RCA 180-out to XLR pin 3
RCA ground to XLR pin 1
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Are the corrections stored in memory in case of power loss
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Yes, the corrections are stored in the units EEPROM memory. It doesn't matter how long the unit is without power, the settings are safe. The lifting setting can also be stored in the memory by pressing and holding the lift button (while the desired setting is active) for a few seconds until the 'beep' sound is heard.
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What kind of target curves does the Lifting 25Hz and Lifting 35Hz have?
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The curves for Lifting 25Hz, 35Hz and flat states are in here:
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My subwoofer makes humming sound or noise after installing Anti-Mode
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A brief guide for solving problems related to electronic interference can be found here.
http://www.jensen-transformers.com/an/an004.pdf
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How do I integrate the 8033-corrected subwoofer to my mains?
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This is essentially same, as compensating the level for the removed modal energy, and the distance for the added A/D-DA delay. Also, the cross-over can usually be set higher to correct the modal resonances up to a higher frequency without getting localization of the subwoofer. First calibrate the subwoofer with 8033 to suppress modes and achieve flat frequency response. Then run the calibration program of the AV-receiver so that it can "see" the corrected subwoofer, and obtain the right level, phase (delay) and cross-over frequency for integration with main speakers.
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What kind of filters does 8033 have?
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The Anti-Mode algorithm in 8033 is capable of designing unconstrained custom-tailored sets of filters. All the filters except liftings are automatically controlled by 8033. There are total of 24 custom-tailored filters designed by counter-room algorithm and 2 user-activated filters in 3 different configurations. A single counter-room filter has virtually unrestricted space for parameters (for example, the maximum Q-value is over 1000).
Additionally there is 1 digital subsonic filter (bypassable) and 1 analog noise-shaping filter at the DAC to enhance SNR.The contribution of the filters is in detail.
The filters are contributed in detail:
15 custom-design digital Anti-Modal oscillators
6 custom-design digital Anti-Modal oscillators reserved for multipoint/ fine tuning in 1-point.
3 custom-design restricted-constraint digital IIR emphasizing bandpass filters
2 alternative user-activated emphasizing lowpass digital IIR filters (15-25Hz / 25-35Hz / off)
1 infrasonic digital IIR filter (active only when lifting is used)
1 analog noise-shaping Bessel-filter (always active)
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Anti-Mode does not seem to make any difference, what could be the problem?
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Check that the microphone is connected well into the mic input. Only use the included microphone.
Check that the microphone is in tact. This can be done by calibrating and putting the microphone very close to the subwoofers cone. If the microphone is functioning, the Anti-Mode should decrease the volume of the measurement signal and signal this with blinking led.
Check that the volume is sufficient. You should be able to hear the calibration signal. If you change the volume of the subwoofer, only do it before, not during the calibration.
When you evaluate the result and compare it to the bypassed, remember to do it at the position where the calibration was done to.
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What frequency range is corrected by Anti-Mode?
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Anti-Mode compensates for 16-144Hz, but it will pass trough any range between 5 and 160Hz.
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Can I use one Anti-Mode for multiple subwoofers?
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One Anti-Mode can be used for any number of subwoofers as long as they have common signal.
If the two subwoofers have separate stereo signals, two Anti-Modes are needed.