The WiiM Ultra is powered by the high-performance ESS ES9038Q2M DAC, delivering exceptional audio clarity and ultra-low distortion.


To further fine-tune the Line Out and Headphone Out audio output, the DAC provides seven digital filter types. Each filter slightly changes how high-frequency content is processed, allowing you to adjust the sound character based on your listening preference. 

Seven DAC Digital Filter Types



1. Brick Wall Filter
Key Feature: Extremely sharp cutoff with minimal aliasing.
Benefit: Delivers the most accurate, analytical sound for technical evaluation.
Suitable Audience: Users focused on measurement, mastering, or maximum signal precision.
2. Corrected Minimum Phase Fast Roll-Off Filter Recommended
Key Feature: Fast roll-off with tight transients and reduced pre-ringing.
Benefit: Balances immediacy and precision for a natural, impactful sound.
Suitable Audience: Audiophiles seeking a perfect balance between accuracy and musicality.
3. Apodizing Fast Roll-Off Filter
Key Feature: Fast roll-off that smooths digital harshness.
Benefit: Restores clarity and cleans up artifacts from earlier recording stages.
Suitable Audience: Ideal for listening to bright, low-quality, or compressed digital recordings.
4. Minimum Phase Slow Roll-Off Filter
Key Feature: Gentle high-end roll-off with minimized pre-ringing.
Benefit: Produces a warm, organic, and analog-like tone.
Suitable Audience: Listeners who prefer relaxed, non-fatiguing, long listening sessions.
5. Minimum Phase Fast Roll-Off Filter
Key Feature: Fast roll-off with clear transients.
Benefit: Delivers a punchy, dynamic, and energetic sound signature.
Suitable Audience: Perfect for fans of bass-heavy music, live recordings, and rock.
6. Linear Phase Slow Roll-Off Filter
Key Feature: Slow roll-off maintaining absolute phase linearity.
Benefit: Offers a relaxed sound with smooth trebles and no fatigue.
Suitable Audience: Users seeking a gentle, laid-back presentation for long sessions.
7. Linear Phase Fast Roll-Off Filter
Default Recommended
Key Feature: Accurate and detailed reproduction with flat frequency response.
Benefit: Accurate and detailed reproduction across the entire spectrum.
Suitable Audience: A versatile "all-rounder" suitable for all music genres and high-fidelity listening.

DAC Digital Filter Settings



  1. Open the WiiM Home app.
      

  2. Go to the Devices tab > Device Settings > Audio Output.
      
  3. Select Line Out or Headphone Out as the audio output.
     
  4. Tap DAC Digital Filter Type at the bottom.
      
  5. Select the filter that best matches your listening preference.