Rupert Neve 511 500 Series Mic PreampWith a big, bold preamp, a swept high pass filter and the powerful saturation control of variable Silk, the 511 Mic Preamplifier combines legendary Rupert Neve tone with 500 Series value. One of the key features of the 511 is the Silk Texture control. The Silk circuit was initially developed for the original Portico series mic preamplifiers, and was only a single switch on or off that added a specified amount of musical, pleasing harmonic saturation