Check the listing for details. Royer dBooster In-Line Signal Booster. Condition: New. Listed at 199.00 USD. Boost Your Ribbon and Dynamic Mics with up to 20dB of Pristine Gain Ribbon mics and dynamic mics are essential tools for any well-rounded studio. Still, they come with one major caveat: they’re power hungry and often require a significant amount of gain to capture low-level sources. The Royer dBooster represents a perfect in-line solution to your low-level woes, injecting ribbon mic and dynamic mic signals with a crystal-clear, switchable 12/20dB dose of gain. This phantom-powered signal booster boasts a massive amount of headroom, exceptionally noise-free operation with essentially zero self-distortion, and exemplary RF protection, elevating your signal and ensuring optimal sound when driving long cable runs.