Focusrite ISA C8X

In 1985, Sir George Martin asked Rupert Neve to build a spare-no-expense mic preamp – that circuit became the foundation of every ISA product since. Forty years on, this is the first audio interface to carry it. In Focusrite's original blue, the ISA C6X is a 26-in, 28-out USB-C unit in a 2U anodised aluminium chassis. With two full-specification ISA transformer preamps on channels 1 and 2, and six ultra-low-noise Focusrite preamps on channels 3 to 8, the architecture is deliberately two-tiered: transformer character where the source demands it, and six pristine channels with plenty of headroom for everything else. Two ISA channels alone would account for a substantial share of the C8X's price if bought independently. Here, they anchor a complete interface. That's 24-bit/192kHz conversion with 125dB dynamic range at the line outputs, ten balanced analogue outputs, an S/PDIF port and two ADAT ports, three independent monitor groups, MIDI and Word Clock – and full remote control via Focusrite Control 2.

The ISA C8X is aimed at recording engineers and producers who track serious sessions – the kind where transformer colour on the lead vocal, a DI'd bass through the Lundahl, or an acoustic guitar through a well-chosen impedance setting makes an audible difference, and where the remaining six channels need to stay out of the way. A tracking session can be run entirely from the rack without opening a laptop – which matters when the talent is in the room and momentum counts. The eight fixed-gain balanced line inputs at +24dBu suit permanent patchbay installations: Connect outboard once, recall the routing in Control 2, and leave it patched. With its external PSU, and for a price that sits above project studio territory, the C8X is a centrepiece for a working studio that runs demanding sessions regularly. Studios needing more than two channels of ISA preamps can pair it with the ISA 428 MkII – four further ISA preamps that connect via the line inputs or ADAT using an external converter.