Digital do MaiN (Japanese: デジタルドメイン株式会社, Dezitaru do MēiN Kabushiki Gaisha) is a Japanese audio engineering company headquartered in Chiyoda, Tokyo, Japan.

[1] The company name emphasises symbiosis of analog and digital technologies (implemented, for example, in a volume control subsystem); the logo symbolizes an input pin jack (left square), output pin jack (right square) and an innovative signal processing unit in between.

Digital do MaiN's power amplifiers use V-FET technology transistors.

As V-FET devices are no longer manufactured, Digital do MaiN builds them itself.

[3] Original design and usage of the 2SK77B V-FET transistor give amplifiers characteristics similar to vacuum tube devices[4] and Triode class A amplifiers which feature very high quality of output sound and cancellation of most of the even distortion harmonics, and allow noise distortion to be less than 0.005%[5] and no loss of original harmonics.