Recently I've bought Sennheiser HD439 headphones.I am satisfied with my purchase as these Cans delivers great sound.The only problem is that the HD439 delivers low volume with my devices eg my cellphone(which is a nokia lumia) and my PC.I want your opinion on whether I should buy a sound card for my PC(and which sound card to buy) or should I get a portable amp or a regular one.Please recommend the best option among the three(sound card,ac powered amp or a portable amp).My budget is $100.I just want loudness in my music without sacrificing the audio quality.
Also,what are your thoughts about Beats by Dre.
Also,what are your thoughts about Beats by Dre.