Hello, I am gonna buy sennheiser's g4me zero and i am a little bit confused. Everyone says that i should get an amp to get their full sound because their impedance is high (150 Ohms) I am using msi's b150a gaming pro as my motherboard and it's says on their web site that the onboard sound card is capable to support headphones that have impedance up to 600 Ohms. So... i should be ok without an amp with sennheiser's g4me zero. Am i right?