Users report gain issues with Audio 4 DJ, requiring frequent software adjustments on Deck B to balance sound levels, indicating potential hardware degradation.

Some users report that the settings.exe, necessary for input level adjustments, may start without displaying, and can be found in the system tray.

Low or absent right-side audio may indicate degraded output capacitors or burned amplifiers, suggesting a need for technical inspection.

Switching from Scratch Control to Internal Playback might not resolve gain discrepancies, as even software gain adjustments are needed for consistent levels.

Windows 10 version 2004 build 19041 or later supports the Audio 4 DJ soundcard, including both A/B inputs and outputs without additional drivers.

The Audio 4 DJ soundcard works in Rekordbox and Mixxx for A/B output, but Traktor 2 still doesn't support it, which is noted as unusual.

The Audio 6 is noted as overpriced, especially for hobbyists. Alternatives like the Xone:23c mixer with integrated soundcard offer better value for those considering an upgrade.

The Kontrol X1 MK2 is praised for its build quality, suggesting Native Instruments’ strong reputation for durable DJ equipment.

Investing in a mixer with a built-in soundcard, such as the Xone:23c, is considered more cost-effective than purchasing a standalone Audio 6 soundcard.

Owners use the Audio 4 DJ as a 2i/2o recording interface in Ableton and a quality headphone DAC for PCs due to its 1/4" headphone jack.

Long-term users noted that older drivers previously failed to install on Windows 10, but recent updates have resolved these issues, enabling full functionality.

Owners experiencing right-side audio issues have confirmed success after capacitor replacement, highlighting a common hardware degradation point.

Replacing capacitors C70, C74, C77, and C81 can resolve audio output issues; requires precise soldering due to component congestion.