The 8-channel NEXUS Microphone-Input Board features A/D converters with 32-bit resolution, a maximum input level of 24dBu, and exceptionally high dynamic range of 158dB (A). Digital gain can be set within the range 0 - 70dB. Stage Tec’s patented TrueMatch technology ensures optimum audio quality. The analogue input stage is an integral part of the 32-bit converter. This architecture confers many benefits since all signal processes such as subsonic filtering, phase inversion, overload protection, and gain adjustment are performed entirely in the digital domain. These digital functions have four independent sets of settings for each analogue input. Differently treated signals can be sent to each of the independent split outputs.
The input stage has a noise level of -132.5dBu (with 0-ohm source impedance) and accepts signal levels of up to 24dBu, thus providing an overall dynamic range of 156.5dB. In theory, this dynamic range could have been achieved using only 28 bits. One advantage of Stage Tec’s strategy of using 32-bit conversion on the XMIC?+ board is that the intrinsic noise acts as a natural dither, which moves the quantisation noise far below the noise level of the connected source.