Well, change the internal wirings! After I bought my Definitive ProSub 100TL, I was terribly disappointed at the power cord. Its those type you will find on the cheapest stuff. When I open up the sub to take a look inside, the internal wirings sucks too! I decided to change the wirings to some decent stuff. In my country, Belden is about the only decent brand available. I bought 12AWG solid core cable (I feel a single thick strand of copper is better is multiple thin strands for power) and some 14AWG cables meant for biamping (4 wires, each 14AWG). I also added an IEC socket with noise filter. This is the toughest part as there aren't any IEC socket, I have to use a file and slowly create a hole big enough for the socket to go thru. One of the capacitor was replaced as I didn't like the brand. Its a luxon 470 micro farad rated at 25V. I bought a chemicon low leakage to replace it. After about 2 days of hard work. I power it up and....wow! The sound is different. The bass is tigher. Transients are more pronounce and it goes deeper and louder at the same volume.