It's optical, it's not supposed to be amplified period, and there is no optical amp that would fit in a portable computer. If the device your hooking it to doesn't go loud enough then you need a new device, or stop using optical because it's not designed for what you want. Optical is designed for professional recording/playback when developing tracks. For playing back itunes through 1/8 stereo jack, you could put pure 100% DAT audio through 1/8 inch stereo jack, so putting it through optical GIVES you no improvement.