>> Product Overview AdPower Sonic is a sound-tuning sheet that applies the patented static electricity suppression technology developed through the automotive AdPower series to a dedicated audio sheet. Developed under the supervision of Koji Morimoto, Chief Recording Engineer at Avex, improvements in sound quality can be expected simply by applying it to your car audio speakers. It has received high praise from many composers, professional musicians, and recording engineers, and is used and loved by audio enthusiasts around the world, including in Japan. The Car Audio Series features a dedicated design that withstands the harsh in-car environment, including heat, humidity, and vibration. Its effectiveness has been scientifically verified through research collaboration with the National Institute of Advanced Industrial Science and Technology (AIST) and Ritsumeikan University in Japan. >> Key Benefits - Clearer sound definition and imaging — effects such as vocals coming forward, harshness in the high frequencies disappearing, and improved bass clarity can be expected - Just peel and apply — no tools or professional installation needed, easy DIY for anyone - Compatible with all car models - Maintenance-free - Affordable sound quality upgrade >> How It Works Sound source analysis conducted at Japan's National Institute of Advanced Industrial Science and Technology (AIST) found that applying AdPower Sonic to speakers tends to increase IACC (Inter-Aural Cross-Correlation Coefficient), an indicator of sound diffusion and spatial spread. Additionally, analysis conducted at Ritsumeikan University showed that in the low-frequency range (250–500 Hz), reverberation tends to lengthen, while at the lowest frequency of 125 Hz, it tends to shorten. These findings suggest that the results may lead to the perception of "tighter bass" and "clearer sound imaging and definition" during actual listening. >> Who Is This For? This product is a tuning accessory designed to pursue subtle changes in sound quality, such as sound definition and imaging. If you have any of the following concerns, AdPower Sonic is recommended for you. - Not fully satisfied with the sound quality of your factory car audio - Want to replace your car audio system but want to keep costs down - Feel that your sound lacks depth or spatial presence Please note: If you are looking for a dramatic change in sound, please be aware that this product may not meet your expectations. >> Set Options Basic Set — 6 sheets (S size ×4, XS size ×2) A set for front and rear door speakers and tweeters (small speakers). Compatible with the standard car audio system of a typical passenger vehicle, this set covers the entire vehicle. For a more noticeable difference, Basic Set is recommended. Starter Set — 4 sheets (S size ×2, XS size ×2) A set for front door speakers and tweeters (small speakers). A great way to start sound tuning, centered around the driver's seat. Add-on set [S size] — 2 sheets Applying AdPower Sonic to all car audio speakers makes the effect easier to notice. Please combine the Basic Set or Starter Set with the Add-on set to adjust the number of sheets. >> How to Install Before purchasing: Please check your car audio system and confirm the number of sheets and sizes you need. 1. Without any sheets applied, play a familiar track for about 30 seconds. Turning up the volume makes it easier to notice changes. 2. Apply all AdPower Sonic sheets to the appropriate positions. 3. Play the same part of the track again and enjoy the changes after installation. If you have any questions about installation, please feel free to contact us. >> Specifications S Size (Rectangular): H 1.6 cm × W 3.2 cm × D 0.1 cm | 0.8 g For speakers with a speaker diameter of 4 inches or larger, such as door speakers, please use S size. XS Size (Hexagonal): 1.4 cm diameter × 0.1 cm thick | 0.2 g For small speakers with a speaker diameter of less than 4 inches, such as tweeters, please use XS size. Speaker diameter refers to the diameter of the hole inside the speaker grille (mesh area). >> FAQ Q1. What if I don't notice any effect? A1. Sound perception varies by individual and also differs depending on environment and equipment. However, as the sheet continues to suppress static electricity, we recommend leaving it on. Also, if the size, quantity, or placement is not appropriate, the effect may be harder to notice. Please double-check that the installation is correct. If you have any questions, please feel free to contact us. Q2. What if I want more effect — or feel it's too strong? A2. If you want more effect, it can be adjusted by purchasing additional sheets. If you feel the effect is too strong, it can be adjusted by reducing the number of sheets or downsizing from S size to XS size. Q3. Where exactly should I apply the sheets? A3. Apply the sheet as close to the speaker hole as possible, without covering it. It can also be applied directly onto the grille. If you have any questions about placement, please feel free to contact us. Q4. Is there an expiration date? A4. AdPower Sonic does not have a set expiration date. However, as the product does deteriorate over time, we recommend replacing it every 2–3 years depending on your usage environment. Q5. Can I reuse the sheet when I change cars? A5. Reuse is possible, however repeated application may reduce adhesion and could cause the sheet to fall off. If possible, we recommend purchasing new sheets suited to your new car's audio system. >> Customer Reviews "The harsh edge in the high frequencies disappeared and it became clean, and I felt the bass became cleaner too." "The effect was immediate. I applied it to my car speakers following the photos on the website, and the sound became clearer." "I compared it with a track I always listen to — the vocals became clearer and it felt like the volume had increased." "The bass tightened up and the highs became clear and crisp. I was honestly skeptical when I purchased it, but I am very satisfied. The reasonable price is also a plus." * Sound perception may vary depending on environment, equipment, and individual sensitivity. Specific results are not guaranteed. * All AdPower Sonic products are manufactured in Japan and shipped directly from Japan. We are not responsible for any issues with products purchased from other sellers.
Basic set, Starter set, Add-on set [S size]