AIYIMA DAC-A2 DC5V Mini USB Powered DAC Audio Decoder Desktop Headphone Amplifier AMP PC-USB/Coaxial/Optical to RCA Headphone Output 24Bits 192KHz Digital-to-Analog Converter : Amazon.co.uk: Electronics & Photo
DAC
AIYIMA DAC-A2 DC5V Mini HiFi Power Audio Decoder PC USB DAC Headphone Amplifier AMP 24-bit 192 kHz Input Coaxial/Optical Decoder Output RCA: Amazon.de: Electronics & Photo
Aiyima Audio A2 Pro USB Gaming DAC Headphone Amplifier ES9018Q2M Mini Decoder for PS4 5 Desktop Active Speaker With Micophone - 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
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 DAC-A2 Mini HiFi 2.0 Digital Audio Decoder USB DAC Headphone Amplifier 24Bit 96KHz Input USB/Coaxial/Optical Output RCA Amp DC5V | Lazada PH
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