AdPower Sonic for Car Audio - Japanese Sound Tuning Sheet for Car Speakers AdPower Sonic for Car Audio is a peel-and-stick sound tuning sheet made in Japan that applies patented static electricity suppression technology to your car speakers. Supervised by Koji Morimoto, Chief Recording Engineer at Avex, it installs on door speakers and tweeters in seconds. It withstands in-car heat, humidity and vibration, and has been studied with Japan's AIST and Ritsumeikan University. Key Benefits Clearer definition and imaging - vocals come forward, less harsh highs, tighter bass Just peel and apply, no tools needed Compatible with all car models Maintenance-free, affordable upgrade How This Car Audio Tuning Sheet Works Analysis at AIST found that applying AdPower Sonic to speakers tends to raise IACC (Inter-Aural Cross-Correlation Coefficient), an indicator of sound diffusion and spatial spread. Ritsumeikan University analysis showed reverberation tends to lengthen at 250-500 Hz and shorten at 125 Hz, heard as tighter bass and clearer imaging. Who Is This For? A tuning accessory for subtle changes in definition and imaging. Recommended if your factory car audio disappoints you, you want better sound at low cost, or your sound lacks depth. It is not meant to be a dramatic change. Set Options Basic Set - 6 sheets (S x4, XS x2): front and rear door speakers plus tweeters; covers a typical passenger car. Starter Set - 4 sheets (S x2, XS x2): front door speakers and tweeters, centered on the driver's seat. Add-on Set (S) - 2 sheets: combine with either set to cover all speakers. Sizes and Specifications S (rectangular): H 1.6 x W 3.2 x D 0.1 cm, 0.8 g - speakers 4 inches or larger, e.g. door speakers XS (hexagonal): 1.4 cm dia. x 0.1 cm thick, 0.2 g - speakers under 4 inches, e.g. tweeters Speaker diameter means the diameter of the hole inside the grille (mesh area). How to Install Check your car audio system and confirm the sizes and number of sheets you need. 1. Before applying, play a familiar track for about 30 seconds at a decent volume. 2. Apply all sheets to the right positions. 3. Play the same part again and hear the change. Frequently Asked Questions Where to apply: as close to the speaker hole as possible without covering it, or onto the grille. No effect? An unsuitable size, quantity or placement makes it harder to notice. The sheet keeps suppressing static, so leave it on. Adjusting: add sheets for more, or use fewer or XS instead of S if it feels too strong. Lifespan: no set expiry, but replace every 2-3 years. Changing cars: reuse is possible, but reapplying weakens adhesion. Sound perception varies with environment, equipment and individual sensitivity; specific results are not guaranteed. All AdPower Sonic products are made in Japan. ■Item Spec Size: XS Size (Hexagon): Diameter 13.5mm, Thickness 1mm / S Size (Rectangle): Height 16mm, Width 32mm, Thickness 1mm Weight: XS Size: 0.2g / S Size: 0.8g
