Uploaded March 2026 | Updated September 2026, 2 weeks ago

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Questyle Sigma Pro review
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I almost always recommend a full-sized desktop DAC and headphone amp for pure performance, but the Questyle Sigma Pro is forcing me to rethink everything. In this review, I put the Sigma Pro head-to-head with the legendary Chord Mojo 2 to see if this new challenger can actually claim the crown for the best portable DAC/Amp under $1,000.

The Sigma Pro features a dual-mono ESS9069Q architecture and Questyle’s famous Current Mode Amplification, delivering 8W of peak power. Whether you are using high-end IEMs like the FiR Audio Radon 6 or demanding full-sized headphones, the versatility here is unmatched. I explore the sonic differences in detail—from bass texture and transient response to soundstage and 3D imaging. I also demonstrate a "stack" that produced the best sound I've heard yet. If you’re looking for a portable solution that doubles as a desktop powerhouse with balanced 4.4mm and 6.3mm outputs, this might be your next upgrade.

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00:00 Questyle Sigma Pro review
01:36 Design & features
02:15 Questyle Sigma vs Questyle Sigma Pro
05:40 Questyle Sigma Pro vs Chord Mojo 2
11:10 Final thoughts

#audiophile #hifi #QuestyleSigmaPro #ChordMojo2 #DAC #HeadphoneAmp #PortableAudio #HighEndAudio #MusicLover #AudiophileReview #DesktopAudio #IEM #HiResAudio