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Audiophiles have been rolling (replacing) op-amps in their DAC units for years. In the computer audio world, high end sound card units from Creative and Asus have had replaceable op-amps in years past and their owners swear by the increased audio fidelity from changing them out. Audio Science...

Audio Science Review has conducted a test of on-board sound from a Hewlett Packard Z series laptop and matched it against an external Topping NX4 DSD portable headphone amplifier and DAC to determine if it is an upgrade from the on-board sound. Although the on-board sound never distorted, the...