Sound Improver 4

Sound Improver 4 uses proprietary ultra-low-frequency technology to enhance the sound quality of headphones and speakers, delivering performance beyond the original factory tuning.
Since these signals are very quiet, they are not distracting even when played through speakers.


User Manual

1. Playback Settings

Turn off audio normalization, tone controls, and any equalizer settings.
For the best results, play audio at its original sampling frequency.


2. Volume Adjustment
For Speakers
Adjust the volume so that the woofer excursion remains within ±0.5 mm (1 mm peak-to-peak).
Excessive woofer excursion may damage the voice coil.
Therefore, avoid using subwoofers whose excursion cannot be visually monitored.

For Headphones
Adjust the volume to the level you normally use on your amplifier.

However, with streaming services, playback may be louder due to audio normalization.
If Sound Improver 4 sounds roughly as loud as other music at the same volume setting, audio normalization is active.

In that case, reduce the volume by approximately 11 dB to achieve the proper playback level, or use the downloaded version instead.


3. Periodic Maintenance Playback

The sound quality will stabilize after several hours of playback. However, periodic playback is recommended to maintain optimum performance.

Sound Improver 4 improves sound quality by optimizing the spacing between fibers or molecules within the diaphragm, reducing friction-related noise generated as the diaphragm deforms during operation.

After approximately 15-30 hours of music playback, the diaphragm gradually moves away from this optimum condition, which may result in a slight reduction in sound quality. To maintain the best performance, Sound Improver 4 should be played periodically.

Simply play Sound Improver 4 when you notice a decline in sound quality.