AIYIMA Audio A2 Mini Stereo USB Gaming DAC Decoder Headphone Amplifier Converter Adapter for Desktop Powered Active Speaker - AliExpress
My (well, comparatively) budget setup. AKG K702s, Aiyima DAC-A2 and FiiO M3K. The DAC isn't great but it's a hell of a step up from the Macbook's headphone jack, IMO. Lucas amiibo
Amazon.com: AIYIMA DAC-A2 Headphone Amplifier DAC with Bass Treble Controls PC-USB/Optical/Coaxial Inputs, RCA/3.5mm Headphone Ouput Digital to Analog Desktop Audio Converter 5V 24Bit 192kHz : Electronics
AIYIMA DAC-A2 Headphone Amplifier DAC with Bass Treble Controls PC-USB/Optical/Coaxial Inputs, RCA/3.5mm Headphone Ouput Digital to Analog Desktop Audio Converter 5V 24Bit 192kHz : Amazon.in: Electronics