If you are on the move a lot with your laptop, it should be great to have an ultra compact DAC and Headphone Amp, that is powered from the USB port, bypassing the sound card of your PC and give output to an optimized headphone amplifier. Please take a look at our FireyeDA. No batteries inside, but powered from the USB bus of your PC. Ultra compact design in an aluminium housing. Plugin your headphone and smile. Behind the 3.5 mm headphone stereo output, there is another surprice : You can see a small Red LED. This is an optical SPDIF output. The FireyeDA can also function as a USB to SPDIF optical converter. Take a look at the FireyeDA. (see picture below)
USB DAC + Headphone Amplifier Ultra Compact in Aluminium Housing.
Fireye Mini Miniature Headphone Amplifier for use with portable equipment 27,00 EUR (incl. 21% VAT)