NPNG is a boutique professional audio company founded by Karl T. Diehl, who began hand-building microphone preamplifiers under the name in 1995. Based in the greater Atlanta area, the company also operates as a recording studio systems integrator, with the preamp line growing out of Diehl's work designing and outfitting commercial studios.

The brand's catalog centers on a small family of hand-built, discrete-transistor microphone preamps, including the two-channel DMP2-NW and the four-channel QMP4-NW, both paired with the LPS-41 external power supply. The designs combine a transformerless discrete input stage with a Jensen output transformer and offer features such as variable input pad, an 80 Hz high-pass filter, polarity reverse, and high gain headroom. Units are made to order in low volumes rather than mass produced.

NPNG preamps have a strong reputation in classical, acoustic, and orchestral recording circles, where they are frequently mentioned alongside Pueblo Audio, Gordon, Forssell, and Pendulum as high-end transparent preamps suited to capturing condenser microphones on instruments like acoustic guitar, mandolin, banjo, and dobro. The company sells primarily through specialist pro audio dealers including Vintage King, Front End Audio, ZenPro Audio, and Studio Economik rather than through a consumer-facing storefront.

NPNG has 2 products cataloged on Equipboard, including Preamps.