26-in/28-out, 24-bit/192kHz USB-C Audio Interface with 8 Preamps, 2 Transformer-based ISA Inputs, 2 Instrument Inputs, 8 Line Inputs, 12 Line Outputs, 2 Headphone Outputs, ADAT, S/PDIF, MIDI, Word Clock, and Focusrite Control 2 Software - macOS/Windows 26-in, 28-out USB-C audio interface with eight preamps, including two ISA transformer mic preamps ISA C8X combines the trademark ISA sound with comprehensive remote control and all the analogue and digital I/O, routing, and recallability you need to run your entire studio, plus switchable impedance, balanced inserts, and high-pass filtering. The first two channels feature ISA preamps with classic Lundahl LL1538 transformers and Console and 430 Air modes for new tonal options. All eight are fully controllable from the front panel and via Focusrite Control 2. The ISA sound, evolved The ISA story starts in 1985 with a request from Sir George Martin to Rupert Neve: build a no-compromise mic preamp. That circuit became the foundation of every ISA product made since. 40 years on, it lives in ISA C8X - Focusrite's first ISA audio interface, housed in anodised aluminium in Focusrite's original blue colour, with heritage transformer sound in a 26-in, 28-out USB-C interface built for the modern studio. Heritage sound with total control The two ISA preamps at the heart of ISA C8X feature the same Lundahl LL1538 transformers Rupert Neve chose in 1985. Warm, rich, and detailed on any source, with up to 79dB of gain, switchable impedance, and balanced inserts - and for the first time in ISA's storied history, remotely controllable via Focusrite Control 2. All-analogue tone ISA gives you two relay-switchable analogue circuits. Console mode introduces warm saturation and low-end punch via a variable soft-clip circuit. 430 Air, lifted directly from the ISA 430 MkII, adds high-end shimmer through an inductor-based high-shelf filter. Both are completely analogue with full-bodied sound. Key features 2U rack-mounted, 26-in/28-out USB-C audio interface Eight remote-controlled preamps with up to 79dB of gain, two of which are ISA preamps with Lundahl LL1538 transformers All-analogue Console and 430 Air modes for tonal shaping 24-bit/192kHz AD/DA conversion with up to 125dB of dynamic range Additional Sonnox bundles available Specifications Hardware Overview Microphone Preamps: 8 Phantom Power: Yes (Independent per-channel) Line Inputs: 8 Instrument Inputs: 2 Insert Sends: 2 Insert Returns: 2 Line Outputs: 12 Headphone Outputs: 2 Line Outputs: 10 Headphone Outputs: 2 ADAT Inputs: 2 (16 channels at 44.1/48kHz and up to 8 channels at 96kHz) ADAT Outputs: 2 (16 channels at 44.1/48kHz and up to 8 channels at 96kHz) SPDIF Input: 1 (2 channels at 96kHz) SPDIF Output: 1 (2 channels at 96kHz) MIDI Input: 1 MIDI Output: 1 Word Clock Input: 1 Word Clock Output: 1 Talkback: Yes Loopback: Yes Connectivity: USB Type-C Protocol: USB 2.0 Form Factor: Rack Mountable (2U) Simultaneous I/O: 26x28 (including Loopback) A/D Resolution: 24-bit/192 kHz Maximum Power Draw: 40W Bus Powered: N ISA Microphone Inputs (Channels 1-2) Frequency Response: 20Hz-20kHz (±0.4dB) Dynamic Range (A-weighted): 117dB THD+N (minimum at minimum gain): -93dB (0.00023%) Noise EIN (A-Weighted): -128dB Maximum Input Level (minimum gain, Low impedance): +16dBu Gain Range: 79dB Input Impedance (switchable): 800Ω (Low), 1400Ω (ISA 110), 2400Ω (Med), 7000Ω (High) High Pass Filter (HPF): 75Hz cut-off frequency, 18dB/Octave Microphone Inputs (Channels 3-8) Frequency Response: 20Hz-20kHz (±0.1dB) Dynamic Range (A-weighted): 116dB THD+N (minimum at 8dB Gain): -100dB (0.001%) Noise EIN (A-Weighted): -127dB Maximum Input Level (minimum gain): +16dBu Gain Range: 69dB Input Impedance: 3200Ω Fixed-level Line Inputs (Channels 1-8) Frequency Response: 20Hz-20kHz (±0.05dB) Dynamic Range (A-weighted): 120dB THD+N (minimum): < -105dB (0.00056%) Maximum Input Level: +24dBu Instrument Inputs (Channels 1-2) Frequency Response: 20Hz-20kHz (±0.5dB) Dynamic Range (A-weighted): 117dB THD+N (minimum): -89dB (0.0036%) Maximum Input Level (at minimum gain): +15dBu Gain Range: 79dB Input Impedance (switchable): 400kΩ (Low), 1.2MΩ (High) Inserts (Channels 1-2) Connection: Balanced Maximum Output Level (send): +16dBu Maximum Input Level (return): +16dBu Line Outputs Frequency Response: 20Hz-20kHz (±0.02dB) Dynamic Range (A-weighted): 125dB THD+N (minimum): -113dB (0.00023%) Maximum Output Level: +24dBu Headphone Outputs Frequency Response: 20Hz-20kHz (±0.1dB) Dynamic Range: 114dB @ 33Ω, 116dB @ 300Ω, 116dB @ 600Ω THD+N: -102dB @ 33Ω, -110dB @ 300Ω, -110dB @ 600Ω Max Output Level: +8dBu @ 33Ω, +11dBu @ 300Ω, +11dBu @ 600Ω Max Output Power: 130mW @ 33Ω, 28mW @ 300Ω, 14mW @ 600Ω Output Impedance: 3Ω Compatibility Windows: Intel, AMD, and Arm64 processors supported MacOS: Apple Silicon and Intel processors supported Linux: ISA C8X is UAC2 class compliant and should work on most Linux systems but this is not tested or supported Dimensions Width: 482.6 mm (19.00 in) Depth: 292.8 mm (11.53 in) Height: 89 mm (3.50 in) Weight: 5.558 kg (12.26 lbs) Power Requirements External: 40W What's in the Box? ISA C8X audio interface 1.5mm USB type C-to-C cable Region-specific IEC cable Rubber feet (x4)
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