Step 4: Setting up the subwoofer(s)
Setting the gain/input sensitivity:
1) Open your owner’s manuals and find the RMS power output of your amplifier and the rated RMS input of your speakers. Write down both and use the lower of the two in the next step.
2) Calculate the desired voltage using the formula: Voltage = SQRT(Power*Resistance)
3) Write down the Sub Voltage
4) Turn the gain/sensitivity all the way down (counter-clockwise)
5) Unhook all subwoofers from the amplifier (unhook at the amplifier)
6) Insert leads of multimeter into one of the channels you’ll be using (if you’re bridging the amplifier, use the terminals you’ll be using)
7) Set multimeter to measure AC voltage
8) Unhook the speakers from the speaker amplifier or turn off the amplifier’s internal amplifier
9) Turn head unit on
10) Insert test tone CD
11) Set track to 60 Hz and set to repeat track
12) Set to the volume written down in the speaker setting stage
13) Slowly turn the gain up until you obtain the desired voltage
14) Turn the volume down to 0
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*3/4
3) If number is not whole, round to the nearest integer
4) Write the SSF frequency down
5) Calculate the desired SSF voltage by using the formula: SSF_Voltage = 0.707*Sub_Voltage
6) Write the SSF voltage down
7) Turn the SSF to the maximum frequency
8) Set track to the SSF frequency and set to repeat track
9) Set to volume written down in speaker setting stage
10) Turn down the frequency on the SSF control until you reach the SSF Voltage from step 6
11) Turn the volume down to 0
