Modders don't want to buy a complete power supply to test out Slims. Instead of having 2 PHAT power supplies, just just your normal power supply and then plug in the adapter when you want to test out a slim. Cheaper, cleaner, and easier.
You should replace your laser lens if your system has the following problems:
4 ohms: 75 watts RMS per channel 8 ohms: 45 watts RMS per channel 8 ohms: 150 watts RMS, bridged mode 10Hz - 70kHz +0, -3dB < 0.02% @ 4ohms, 20Hz - 20kHz +4dB for rated output -85dB, 1kHz +/- 50 mV, Servo controlled