Eight channel mic pre and optional A-D

ISA 828 incorporates eight of Focusrite's renowned mic pres in a simple-to-operate 2U enclosure, placing four mic preamps, instrument inputs and line ins at your fingertips. The original Focusrite mic pre was designed to suit the microphones of the time; today's model makes one small change, adding three additional input impedances to the classic ISA 110 setting, allowing you to match any microphone, old or new, and access a wide range of sounds, from the character and warmth of a vintage mic to the clear transparency of a modern design.

Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source. Up to 60dB of gain is available on the four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter features variable cut-off frequency between 16 and 420Hz. An array of 6-segment LED meters show peak signal level for the four mic pres, in addition to the four direct inputs to the optional A-D card. Switchable rear-panel insert points allow the use of inline processors such as compression.

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Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
Front-panel instrument inputs to first four channels
Line inputs with dedicated input connectors and front-panel switch
Switchable input impedance including classic ISA 110 setting
High-pass filters
Switchable insert points when used with A-D card
Per-channel six-segment LED peak-level meters
Optional A-D card with up to 192kHz, 24-bit sampling via ADAT or AES3

specifications

Mic Inputs


Gain range (Mic)

0 dB to 60 dB in 10 dB steps

Input Impedance (Mic)

Variable, 600O, 1k4O, 2k4O, 6k8O

Noise at main output with gain at unity (0 dB) (Mic)

-97 dBu measured with a 22 Hz / 22 kHz bandpass filter

Signal to noise ratio relative to max headroom (9dBu) (Mic)

106 dB

THD at medium gain (30dB) (Mic)

0.0008 measured with a 1 kHz -20 dBu input signal and with a 22 Hz / 22 kHz bandpass filter

Frequency response at minimum gain (0 dB) (Mic)

-0.5 dB down at 10 Hz and –3 dB down at 110kHz

Frequency response at maximum gain (60 dB) (Mic)

–3 dB down at 16 Hz and –3 dB down 85 kHz

CMRR (Mic)

91.8 dB (Channel 1, 1 kHz, maxiumum gain)

Line Inputs


Input Impedance (Line)

10 kO from 10 Hz to 200 kHz

Gain range (Line)

-20 dB to 10 dB in 10 dB steps

Noise at main output with gain at unity (0 dB) (Line)

-96 dBu measured with a 22 Hz / 22 kHz bandpass filter

Signal to noise ratio relative to max (Line)

120 dB

Signal to noise ratio relative to 0dBFS( 22dBu) (Line)

118dB

THD at unity gain (0dB) (Line)

0.001 measured with a 0 dBu input signal and with a 22 Hz / 22 kHz bandpass filter

Frequency Response at unity gain (0dB) (Line)

0.3 dB down at 10 Hz and –3 dB down at 122 kHz

Instrument Inputs


Gain range (Instrument)

10 dB to 40 dB continuously variable

Input Impedance (Instrument)

1 MO or 300 kO

Noise at minimum gain ( 10 dB) (Instrument)

-90 dBu measured with a 22 Hz / 22 kHz bandpass filter

Noise at maximum gain ( 40 dB) (Instrument)

-62 dBu measured with a 22 Hz / 22 kHz bandpass filter

THD at minimum gain ( 10 dB) (Instrument)

0.002 measured with a 10 dBu input signal and with a 22 Hz / 22 kHz bandpass filter

Frequency Response at 10 dB gain with -10 dB input (Instrument)

10 Hz - 200 kHz /- 0.6 dB

Frequency Response at 40 dB gain with -40 dB input (Instrument)

-2.5 dB down at 10 Hz and 0 dB at 200 kHz

Roll off

18 dB per octave 3 pole filter

Frequency (Instrument)

Fixed 75Hz measured at the 3dB down point

Weight and Dimensions


Weight

8.84 kg (19.5 lbs)

Dimensions (W x H x D)

484mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink)

Downloads

test


Rednet Control 2.0.3

User Guide


ISA 828 User Guide - Spanish

ISA 828 User Guide - German

ISA 828 User Guide - French

ISA 828 User Guide - English

ISA828 & ISA428 ADC Installation Guide - German

ISA828 & ISA428 ADC Installation Guide