🎶 Unleash the Sound Revolution! Transform your audio experience with enhanced high-frequency performance. Lightweight and easy to handle, perfect for any audio enthusiast. Designed specifically for 4" voice coils, ensuring a perfect fit. Keep your voice coil cool for longer-lasting sound quality. Unlock the full potential of your midrange drivers with this innovative kit. Compact Size 900 uL Volume 18 g Weight The Springfield Speaker Ferrofluid Kit is a high-performance audio enhancement solution designed for 4" voice coils. With 900 uL of ferrofluid, it improves sound quality by enhancing high-frequency and midrange driver performance while effectively conducting heat away from the voice coil. Weighing only 18 g and featuring compact dimensions, this kit is perfect for audio professionals and enthusiasts alike.