Printable manual for a Acoustik ts1440 amp

SOURCE: 600 watt 2 channel power acoustik sterling amp

On your amp, there should be a switch (on the side probably) that has "LP", "HP", and "FULL" or "OFF". This is a switch for the low pass/high pass filter. Switch it to "LP" as this will allow only low frequencies to go to your subs, what you want. If you don't have that switch, go to an audio store or online audio supplier and get either a low pass filter, band pass filter, or a cross-over, and follow the wiring diagram that comes with it to filter out the high frequencies before they get to your subs.