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Setting amplifier gain with an lc2i To answer your other questions Any bass knob you’re using should be connected and set to max before setting gains. Set your radio eq to flat, bass boost and loudness off, and subwoofer level either to 0 (not boosted or cut). You can see bass roll off using your multimeter, you set it to ac voltage and connect it at either the signal coming into the lc2i, the output of the lc2i or the amplifier speaker output, all three locations will show it, make sure you have accubass level and threshold all the way down when testing for it. Play your 40 or 50hz test tone. You will see one of three things, as you turn the volume up the voltage will either continue to rise as you turn volume up all the way through max volume, or at some point (maybe 2/3 max volume) you will see the voltage stop rising as you turn volume up (it may rise slightly but not nearly as much as it was at lower volume adjustments, or lastly, voltage will actually decrease as volume turns up. If your voltage continues to rise, you do not have bass rolloff and probably would not want to use accubass. If your voltage stops rising you can use accubass but personally I do not like it, to me it sounds like a bass boost applied at high volumes which makes volume adjustment not very smooth, you will have low bass at lower volumes and all of a sudden it will turn on and suddenly have a lot more bass. Personally in this situation I just adjust the gains to achieve desired voltage at the volume that the voltage on the test tone stops rising. If you have the third situation where voltage actually starts lowering, this is where accubass shines. Adjust the threshold to turn on just before the volume that bass rolloff starts. The subsonic filter should be set to half an octave below the enclosure tuning frequency. That enclosure is tuned to 34hz according to Skar’s website so set it to around 24hz. Below the enclosure tuning frequency your ported enclosure loses the benefit of the air inside the enclosure acting as part of the subwoofer’s suspension and risk blowing it, the subsonic filter helps by lowering output below that frequency. For an RTA you can get a UMIK-1 and download REW (room eq wizard) for free. There is a lot to learn about REW so prepare to spend some time figuring it out. To see the signal itself you can get a line out converter connected to your input signal and then connect an rca to 3.5mm cable and plug it into your microphone input. You may be looking for an oscilloscope though for what you’re trying to do which will let you see the sine wave and help show you when your signal is clipping. You can find cheap-ish ones on Amazon. Hope this helps a little.