In-Line Signal Booster

Royer Labs, a manufacturer of high quality ribbon microphones, has announced the dBooster (model R-DB20) In-Line Signal Booster for ribbon & dynamic microphones. As a phantom powered microphone signal booster and impedance buffer, the new Royer Labs dBooster accurately increases the level of passive low-output ribbon and moving coil dynamic microphones without distortion or colouration. Designed for professional applications, the dBooster provides two levels of clean gain boost: either 12dB or 20dB, selectable by a front panel switch. The dBooster maintains headroom and gain regardless of load.

The heart of the dBooster design is an input stage consisting of multiple paralleled PNP semiconductors to keep noise low. These devices run in pure Class A mode for minimal distortion. The Class A input circuitry presents a high source impedance to the microphone to minimize loading (damping), reducing coloration and distortion while improving headroom. By utilising the unit’s 12/20dB gain switch, optimum balance between gain and headroom can be achieved for a variety of applications.

The low-impedance output of the dBooster is an increased microphone-level signal that can drive either a standard microphone preamplifier or a digital interface directly. The unit’s output section utilises a pair of operational amplifiers that act as buffers and low impedance line-drivers. The output stage enables the dBooster to drive difficult loads and long cable lengths without sacrificing gain or performance while maintaining excellent headroom. The dBooster’s circuit is phantom powered and is fully regulated and de-coupled – providing clean voltage and current for optimum circuit operation.

Royer’s new dBooster is safe for use with all ribbon microphones and provides increased headroom at the preamp, true electrical isolation, and the protection of ribbon mics from phantom power hits – all while minimising mic loading. Further, it can drive difficult loads such as mic splitters and vintage-style preamps without loss of gain or increased distortion.

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