Limited Offer Ex-Display Classic Quad Preamp with DI inputs and a Premium A-D converter

Focusrite ISA428 MkII: - CONDITION: A1, includes all accessories and full manufacturer's warranty.

The Focusrite ISA428 MkII provides four classic preamps with DI inputs and a premium eight channel A-D converter option. The ISA428 MkII creates the perfect front end for the discerning recording professional.

The ISA microphone preamp 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 MkII. 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, accurate six-segment LED metering 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 ISA428 MkII brings legendary tools to your studio at an exceptional new price.

Focusrite ISA428 MkII Features:

• 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

Focusrite ISA428 MkII Specifications:

Mic Inputs

• Frequency response at minimum gain (0dB): -0.35dB at 20Hz and –3dB at 122kHz
• Frequency response at maximum gain (60dB): –2.5dB at 20Hz and –3dB 103kHz
• Gain range: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trim
• Maximum headroom: +7.4dBu
• THD+N: 0.0009% (measured at 1kHz -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter)
• Noise EIN: -126dB (measured at 60dB of gain with 150Ù termination and 20Hz/22kHz bandpass filter)
• Noise at main output with unity gain: -98dBu (measured with a 20Hz/22kHz bandpass filter)
• SNR: 123dB (relative to max output 25dBu)
• SNR: 120dB (relative to 0dBFS (+22dBu)
• CMRR: 88dB.
• Input Impedance, variable: 600Ù, 1400Ù, 2400Ù, 6800Ù

Line Inputs

• Frequency Response at unity gain (0dB): -0.3dB at 20Hz and –3dB at 94kHz
• Gain range: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trim
• Maximum headroom: +25.4dBu
• THD+N: 0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)
• Noise at main output with unity gain: -91dBu (measured with a 20Hz/22kHz bandpass filter)
• SNR: 116dB (relative to max output 25dBu)
• SNR: 113dB (relative to 0dBFS +22dBu). Input Impedance: 10kÙ

Instrument Inputs

• Frequency Response at +10dB gain: -0.2dB at 20Hz and 0dB at 200kHz
• Frequency Response at +40dB gain: -3dB at 20Hz and –3dB at 38.4kHz
• Gain range: +10dB to +40dB continuously variable
• Maximum headroom: +11.5dBu
• THD+N: 0.006% (measured with –20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter)
• Noise at main output with minimum gain (+10dB): -95dBu (measured with a 20Hz/22kHz bandpass filter)
• Input Impedance = >1MÙ

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). The meter calibration points are as follows:

Meter panel calibration value in dBFS / Equivalent dBu value
0dBFS / +22dBu
-2dBFS / +20dBu
-6dBFS / +16dBu
-12dBFS / +10dBu
-18dBFS / +4dBu
-42dBFS / -20dBu

Front and rear connectivity

• 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
• Other I/O
  • IEC power input connector 100Vac – 240Va
• Front Panel Indicators
  • 8 output meters, 6 segment
  • 4 30-60 mic gain range selection indicator
  • 4 +48V phantom power indicator
  • 4 Phase indicator
  • 4 Insert In indicator
  • 4 Filter In indicator
  • 4 Input selection indicators (Mic, Line, Inst)
  •  4 Z In microphone input impedance selection indicators (Low, ISA110, Med, High) Clock select
  • Indicators (44.1, 48, 88.2, 96, 176.4, 192)
  • Ext clock indicators (Lock, Word clock, 256X)
• 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)