Focusrite ISA428 MkII Quad Pre Amp

Focusrite ISA428 MkII replaces the original ISA428. Focusrite ISA428 MkII Quad Pre Amp delivers four classic preamps, derived from the ISA 110 module, featuring DI inputs and an 'Optional' premium eight channel A-D converter. ISA428 MkII creates the perfect front end for the discerning recording professional.

Focusrite ISA microphone preamps holds a reputation for outstanding transparency along with subtle warmth contributed by transformer core saturation. The addition of a variable impedance circuit allows ISA users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone. Unchanged for decades, the ISA microphone preamp topology offers incredible clarity and the signature Focusrite sound that makes it the top choice among many audio professionals today.

The optional class-leading ISA828 eight-channel A-D converter is also compatible with the ISA428 Mk2. Along with the four mic preamp inputs, four additional inputs allow you to route other line signals through the converter. High quality Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips seated within Focusrite custom analogue circuitry deliver unparalleled performance. Specifications include a dynamic range of 122dB and jitter performance below 250 picoseconds. The card can be retrofitted at any time. Thanks to its convenient 25-pin D-Type connector, it integrates seamlessly with most digital workstations, including Pro Tools. Focusrite's instrument inputs are instantly accessible on the front panel which allow quick and easy connection without the need for a separate DI box. Extra processing can be placed between preamp and conversion via the units dedicated insert points, featured on every channel. Finally, the Focusrite ISA428 Mk2 features highly accurate six-segment LED metering, which is designed to catch even the fastest transients on every channel.

Whether you’re looking to preserve the sound of your classic microphones, or searching for the perfect front end for your digital studio, the Focusrite ISA428 MkII brings legendary tools to your studio at an exceptional new price.

• Four ISA series transformer-based preamps

• Eight-channel optional A-D converter
• Selectable impedance
• Four front panel instrument inputs

• Dedicated analogue insert points
• Variable high pass Focusrite filter

• Accurate LED meters for every channel

• Phantom power available on every channel
• Trim control allows 20dB of extra gain with fine adjustment 
• Phase reverse buttons help to correct phase issues with microphones or cables
• Optional A-D converters easily synchronise to external word clock
• Analogue Channel Inputs (Inputs 1-4)
  • 4 instrument 1⁄4” TS jack inputs on front panel
  • 4 microphone XLR inputs on rear panel
  • 4 line 1⁄4” TRS jacks on rear panel
  • 4 insert return 1⁄4” TRS jacks on rear panel
  • 4 ADC XLR inputs on rear pane
• Analogue Audio Outputs (Outputs 1-4)
  • 4 line XLR outputs on rear panel
  • 4 insert send 1⁄4” TRS jacks on rear panel
• High Pass Filter
  • Roll off = 18dB per octave 3 pole filter
  • Frequency range: 16Hz to 420Hz (continuously variable, measured at the 3dB down point)
• Meters
  • 6 LED meter is calibrated 0dBFS = +22dBu (the maximum level which can be correctly converted by the optional internal A/D converter before overload occurs).
• Weight: 5.5kg 12.2lbs
• Dimensions (W x H x D) 480mm (W) x 88mm (H) x 280mm (D) 19" (W) x 3.5" (H) x 11" (D)