Focusrite ISA One Analogue

The Focusrite ISA One is a single-channel microphone preamplifier and DI unit designed for professional studio recordings. This unit features the classic ISA 110 input transformer and discrete Class-A circuitry, delivering the transparent, low-noise sound quality that is a hallmark of the ISA tradition. It offers a microphone input with switchable phantom power, an instrument input for direct connection of guitars and basses, as well as a line input. The preamplifier includes a high-pass filter, phase reverse, and a variable impedance control for the microphone input to tailor the sound to different sources. The front panel provides gain control, peak LED indicators, and a large VU meter for precise level monitoring. The rear panel features balanced XLR and TRS outputs, a front panel insert point for external signal processing, and a slot for an optional digital output card in ADAT or AES/EBU formats. Built with a robust steel chassis, the ISA One measures 210 mm in width, 44 mm in height, and 230 mm in depth, weighing approximately 2.5 kg. It operates with an external power supply and is designed for reliable performance in demanding studio environments. This preamplifier is suitable for recording vocals, acoustic instruments, and electric instruments, providing a versatile, high-quality front-end solution for home studios, project studios, and professional facilities seeking the classic Focusrite sound in a compact single-channel format.