User Manual

ISA428 MkII
FOUR CLASSIC PREAMPS WITH DI INPUTS AND A PREMIUM EIGHT-CHANNEL A-D CONVERTER OPTION
With a design topology unchanged since its introduction in 1985, ISA series mic preamps have been the producers’ choice on countless hit records
over the last three decades. The ISA428 MkII provides four of Focusrite’s 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.
The acclaimed optional ISA828 eight-channel A-D converter is also compatible with the ISA428 MkII. High-quality converter chips seated within
Focusrite custom analogue circuitry deliver unparalleled A-D performance, including a dynamic range of 122dB and jitter performance below
250 picoseconds.
Four ISA SerIeS trAnSFormer-bASed preAmpS
ISA series mic preamps have been the producer’s 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
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 ISA110 and the legendary Focusrite Forté console.
‘AnAlogue or dIgItAl?’
Paired with Focusrite’s professional A-D converter option, the ISA428 MkII makes the perfect front-end for your digital studio. The A-D card allows
you to convert four line signals in addition to your ISA428 MkII mic / line inputs. The card can be retrofitted at any time and integrates seamlessly
with most digital workstations, including Pro Tools HD.
Rear image
features the
A-D converter
card - not fitted
as standard
AddItIonAl FeAtureS:
• AccurateLEDmetersoneverychannelcatcheventhefastesttransients
• Phantompoweravailableoneverychannel
• Trimcontrolallows20dBofextragainwithneadjustment
• Phasereversebuttonshelptocorrectphaseissueswithmicrophones
or cables
• OptionalA-Dconverterseasilysynchronisetoexternalwordclock