Listening to Lofi Girl radio on the X220, with an Aune 'mini usb dac V2 SE' and Sennheiser HD6XX. FreeBSD 14.4-RELEASE, running windowmaker desktop. The box under the DAC is a regulated linear PSU.
Sounds very nice just using pcm and OSS with default settings. The Aune uses a Burr-Brown PCM1793 https://www.ti.com/product/PCM1793 and has a headphone amp section based on an OPA2604 op-amp https://media.digikey.com/pdf/Data Sheets/Texas Instruments PDFs/OPA2604.pdf . Beyer DT-990's also sound nice with this setup.
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FreeBSD 14.4-RELEASE, running windowmaker desktop. The box under the DAC is a regulated linear PSU.
