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Message: <blockquote data-quote="Tek18" data-source="post: 7576064" data-attributes="member: 637500">"Setting the subsonic filter (if available):1) Determine the tuning frequency of your enclosure (if using a sealed enclosure, turn SSF off or to minimum frequency)2) Calculate the desired SSF frequency by using the formula: SSF = Tuning*3/43) If number is not whole, round to the nearest integer4) Write the SSF frequency down5) Calculate the desired SSF voltage by using the formula: SSF_Voltage = 0.707*Sub_Voltage6) Write the SSF voltage down7) Turn the SSF to the maximum frequency8) Set track to the SSF frequency and set to repeat track9) Set to volume written down in speaker setting stage10) Turn down the frequency on the SSF control until you reach the SSF Voltage from step 611) Turn the volume down to 0Setting the low-pass filter:1) Turn off the head unit2) Unhook the multimeter from the sub amp3) Hook up the speakers and sub(s)4) Turn the low-pass filter on. If your HU and amp both have LPFs, use the one with the most flexibility (continuously variable &gt; selectable &gt; fixed)5) Turn the LPF frequency to the minimum frequency6) Insert music you’re familiar with7) Turn the volume up to a comfortable level8) Turn up the LPF frequency until one of the following is true: the sub stage and speaker stage blend perfectly, you can tell the bass is coming from the rear, or the bass starts sounding weird. If the latter two, use the highest setting before audible anomaly.9) Turn volume down to 0 and turn off head unit"all seem to be by ear, is there a way to set it exact with the DDM?</blockquote>

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