The Millennia HV-3D eight channel mic preamp is probably the cleanest, most natural sounding preamp in the world. It’s frequency response is 8Hz-300KHz and has incredibly low distortion. It doesn’t get any higher quality than this.

The API 3124+ has four of the same preamps as all API consoles. It uses the RE-115 K input transformers and it features the discrete 2520 op-amp. This unit has a wonderful forward, punchy midrange and vintage character.

The Universal Audio 4-710d has four 710 Twin-Finity mic pres with A/D conversion. The preamps take a Class A FET preamp and a separate Class A tube preamp and give you the ability to blend the two signals to taste, from velvety tube character to ultra clean. All four channels also have an 1176-based compressor.

The Focusrite ISA428 has four channels of the legendary Rupert Neve designed ISA 110 preamps from the Forte console as requested by Sir George Martin. Imagine a Neve preamp, but better. This unit also has the eight channel AD expansion card.

The Audient ASP880 has eight high end mic preamps. They have the same discrete, Class A design as found on Audient's flagship console, along with 8 channels of Burr Brown A/D conversion.