Measurement of characteristics. Testing the active filter of the subwoofer
| Testing device | Active subwoofer filter |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>Active subwoofer filter>E-MU1616m |
| Supply voltage AC | 18V...0...18V |
| Normalize amplitude | ON |
| Level change | -0.5 dB / -0.5 dB |
| Mono mode | ON |
| Calibration singal, Hz | 100 |
| Polarity | correct/correct |
Frequency response, cutoff minimum
Left |
Right |
|
| Frequency From 20 Hz to 20 kHz, dB | -29.82, +60.81 |
-29.82, +60.81 |
Frequency response, cutoff maximum
Left |
Right |
|
| Frequency From 20 Hz to 20 kHz, dB | -31.60, +46.43 |
-31.60, +46.43 |
Phase adjustment, minimum
Phase adjustment, maximum
Conclusions
| High quality dual op amp pre-amplifier designed for for cutting off high and mid frequencies, with basic adjustments for this type of device. The module allows regulate: |
| - Cutoff frequency |
| - Phase |
| - Output signal level |
|
Summary: An active subwoofer filter connects between the stereo or mono signal source and the subwoofer amplifier dynamics. Cutoff frequency adjustment between 25-150Hz allows you to tailor the subwoofer to specific audio system, depending on its frequency response. A phase adjustment of about 150 ° allows the subwoofer to be synchronized with low-frequency speakers of the audio system. To widen the angle of this adjustment, you can try to change the polarity subwoofer speaker. Adjusting the power level of the subwoofer adjusts the bass level signal to taste, depending on preference and removal of the subwoofer from the speaker. You can buy a subwoofer filter from us at kit-amp.com. It should also be noted that, subjectively, with a decrease in the cutoff frequency, the level the power of the output signal of the subwoofer decreases, however, in this module, when the cutoff frequency decreases, raising the output level, which slightly reduces this effect |
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