Want Better Pricing? Call us

800-248-7540

Free Shipping FREE SHIPPING
   Click here for Details

Focusrite ISA428-MKII 4 Channel Pre amp

Regular Price: $1,899.99

Sale Price $1,499.99

Usually ships in 7-14 business days. Need it Fast? Call us
In StockAvailability: Usually ships in 7-14 business days. Need it Fast? Call us Free Shipping FREE SHIPPING!
*Special Order
ISA428-MKII | Mfr#:
View Detail
OR

Quick Overview

Pre amp, 4 Channel The ISA428 MkII provides four of Focusrites prestigious transformer-based microphone preamps. It features the same classic circuitry and renowned audio quality found in the original at a new level of affordability. With selectable ...

Details

The ISA428 MkII provides four of Focusrites prestigious transformer-based microphone preamps. It features the same classic circuitry and renowned audio quality found in the original at a new level of affordability. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analogue to digital conversion, the ISA428 MkII creates the perfect front end for the discerning recording professional.

First introduced in 1985, 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 eight-channel A-D converter option used with the ISA828 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. More information about the ISA428 MkII A-D converter option can be found here<=link to ISA428/828 ADC option page>.

Four instrument inputs, instantly accessible on the front panel, 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.

Focusrite ISA428-MKII Features:

  • Four ISA series transformer-based preamps
    ISA series mic preamps have been the producers choice on countless hit records over the last two decades.
  • Eight-channel optional A-D converter
    Four additional A-D converter inputs allow eight channels of high-quality conversion, with a dynamic range of 122dB and jitter performance below 250 picoseconds.
  • Selectable impedance
    Ideal for mic matching or extended microphone creativity. Settings include the Vintage ISA110 setting, providing the original Focusrite signature sound.
  • Four front panel instrument inputs
    Instant access on the front fascia - no separate DI box required.
  • Dedicated analogue insert points
    Switchable insert points are featured on every channel, allowing routing (between preamp and output) through additional external processing.
  • Variable high-pass Focusrite filter
    Provided on every channel, this is the same filter as featured on the original ISA428.
  • Accurate LED meters for every channel
    Clear metering designed to catch even the fastest and most elusive of transients.
  • 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 150O 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: 600O, 1400O, 2400O, 6800O

    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: 10kO

    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 = >1MO

    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 panel

    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 240Vac

    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)

    Additional Information

    Subtitle 4 Channel Pre amp
    SKU ISA428-MKII
    Mfr# N/A
    Manufacturer Focusrite
    Warranty Default 1 Year
    Special Order Special Order
    Free Shipping
    Lease Amount No
    Sale Increment N/A

    Product Tags

    Use spaces to separate tags. Use single quotes (') for phrases.

    Write Your Own Review

    You're reviewing: Focusrite ISA428-MKII 4 Channel Pre amp

    How do you rate this product? *

      1 star 2 stars 3 stars 4 stars 5 stars
    Value
    Quality
    Price

    Questions on Focusrite ISA428-MKII 4 Channel Pre amp

    No questions asked yet

    Similar Products

    Why we're the best

    Been in Business for 20 Years 15 years in Business Authorized Dealer Authorized Dealer Church Discounts Church Non-Profit Discounts Lifetime Tech Support LifeTime Tech Support Secure Shopping SSL Secured & PCI Compliant

    Wholesale Distributor Wholesale Distributor