Audio System Test CD // For refreshing your audio equipment

This CD contains sound sources for checking and tuning audio equipment performance, as well as for aging speakers, headphones, and earphones to restore their original performance.

Contents: (Total approx. 52 minutes) Each section begins with an announcement of the item name in English (PC-generated voice).

Usage Examples:
- Aging of speakers, headphones, etc.
- Investigating the cause of muddy sound or boomy bass.
- Testing and checking the playback frequency range.
- Sound source for verifying speaker placement.
- Detecting abnormal resonance and vibration in audio racks, room walls, etc., during low-frequency playback.
- Testing DIY speakers, checking for box resonance, and confirming reinforcement points.
- Checking low-frequency playback of car audio and woofers.
- Verifying abnormal resonance and vibration within the car during low-frequency playback of car audio.
- Testing and adjusting DIY speakers, etc.
- As a sound source for measuring the frequency response of amplifiers, etc.
- Adjusting and confirming crossover frequencies for multi-system setups.

Comments from purchasers:

- I bought this for aging my new earphones.
- It outputs frequencies separately, so I was able to identify which frequencies had dips.
- An essential CD for audio (frequency measurement).
- I use it for adjusting and setting up my DIY speakers.
- I tested my car's interior environment. I had been feeling something was off with the bass. As expected, there was resonance in the low-frequency range. This has given me the resolve to proceed with sound deadening the car doors.
- I was looking for this kind of sound source and was glad to get it at a low price.
- I used it to check the performance of my DIY speakers and found that the low-frequency range produced a buzzing sound, which I will now investigate further.
- I used the aging sound source and feel like I was able to refresh the speakers that had been unused for a while.
- I discovered that the low and high frequency ranges of my earphones are not optimal, and I think this could be useful as a test source when purchasing products.
- I bought it thinking I could use it like an old tone generator. It's convenient to play the sound source on a CD player.

The color of the CD-R, case, and CD manufacturer may differ from the photos.
We do not guarantee any improvement in sound quality due to aging.