TechPowerUp reviewed the S.M.S.L SU-6 DAC + SH-6 Amplifier Desktop Stack
A quote from the article:
S.M.S.L enters the TechPowerUp review database with its budget-friendly SU-6 DAC and SH-6 headphone amplifier, which stack together for a combination that is already a commercial success. We take a detailed look at both in this review, and see how the combo performs for those looking at a starter audio source set that doesn't take up much room or leave your wallet empty.S.M.S.L SU-6 DAC + SH-6 Amplifier Desktop Stack Review