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 Audio DAC A2 Decoder Sound Amplifier Digital to Analog Audio Converter MINI HiFi 2.0 Home Theater USB Coaxial Optical - Walmart.com
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
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 - Amazon.com
Aiyima Mini Hifi 2.0 Digital Audio Decoder Usb Dac Headphone Amplifier 24bit 96khz Input Usb/coaxial/optical Output Rca Amp Dc5v - Headphone Amplifier - AliExpress
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