Does your USB audio system suffer from annoying background noise? The iFi iSilencer+ USB Rebalancer is a simple and direct upgrade for all USB ports and computer audio setups. This high tech device not just a noise filter, outfitted with Active Noise Cancellation (ANC) technology the iSilencer3.0 lowers RFI/EMI noise by up to 40dB, reduces jitter and packet errors, Rebalances the USB signal, and incorporates cutting edge engineering for optimum signal transfer. You'll hear blacker backgrounds, deeper details, extended dynamics, and greater clarity immediately. Whether you utilize a computer server or hard drive, have a high end system, the iSilencer+ is an excellent noise killer. Plus, employing iSilencer+ produces a cumulative effect. Designed to be used on both active and inactive USB ports, the more you use on your system, the more noise that gets eliminated. Simply plug in and enjoy your music again. Note: Sometimes diagnosing the source of noise issues can be a challenge. If your noise doesn't improve or gets worse, iFi has other solutions available and a wide variety of tools and resources to help you understand which product is best for your system.