So i have a Fosi Audio Dac-Q4 and I'm using them to power my Sennheiser HD 600 the amp/dac says that its rated for highest of 200Ohm headphones but its plenty loud is it worth returning this one and buying another one thats rated for higher Impedance headphones, will that improve my quality, or help soundstage or will it not do anything I'm very new to all of this Audiophile stuff any help would be greatly appreciated.