ISA 828 incorporates eight of Focusrite's renowned mic pres in a simple-to-operate 2U enclosure, placing eight mic preamps, instrument inputs and line ins at your fingertips.
Focusrite's new ISA828 eight channel microphone pre-amplifier, providing eight original ISA transformer-based pre amps in a single robust 2U chassis, offering the Focusrite signature sound at its lowest cost per channel to date.
The eight ISA-series transformer-based microphone pre amps, with switchable impedance and direct instrument inputs, are complemented by eight line inputs, eight line outputs and an optional eight channel 192kHz ADC. Thanks to its convenient 25 pin D-Type connectors, the ISA828 integrates quickly and seamlessly with ProTools HD, as well as other popular hard disc recorders and mixing desks.
The microphone input stage includes a variable impedance circuit, allowing the user to switch between four carefully selected input impedance settings. The original ISA 110 setting is supplemented by three further impedance settings to either perfectly match the pre amp with any microphone, thus maximizing level, or to use different settings creatively to shape the sound of the microphone being used.
The four front panel instrument inputs also feature high and low impedance options to provide a comprehensive and accessible DI solution. Insert points are also featured on every channel, should the need arise to place extra processing between the pre amp and converter, Vintage design high pass filters are also provided on every channel, ideal for eliminating unwanted low frequencies without affecting the rest of the audio signal.
The ISA828's new optional eight-channel 192kHz ADC is the first audio ADC to utilise Texas Instruments Burr-Brown Pro Audio Amplifiers and Flagship Analog to Digital Converter PCM4220 chips. This cutting-edge technology is encompassed within Focusrite's own custom analogue circuitry to provide eight channels of unparalleled A/D conversion, delivering a dynamic range of 122dB and jitter at
Classic ISA mic preamp design featuring Lundahl LL1538 input transformerFront-panel instrument inputs to first four channelsLine inputs with dedicated input connectors and front-panel switchSwitchable input impedance including classic ISA 110 settingHigh-pass filtersSwitchable insert points when used with A-D cardPer-channel six-segment LED peak-level metersOptional A-D card with up to 192kHz, 24-bit sampling via ADAT or AES3
Gain Range (Mic): 0 dB to 60 dB in 10 dB stepsInput Impedance (Mic): Variable, 600O, 1k4O, 2k4O, 6k8ONoise At Main Output With Gain At Unity (0 DB) (Mic): -97 dBu measured with a 22 Hz / 22 kHz bandpass filterSignal To Noise Ratio Relative To Max Headroom (9dBu) (Mic): 106 dBTHD At Medium Gain (30dB) (Mic): 0.0008 measured with a 1 kHz -20 dBu input signal and with a 22 Hz / 22 kHz bandpass filterFrequency Response At Minimum Gain (0 DB) (Mic): -0.5 dB down at 10 Hz and -3 dB down at 110kHzFrequency Response At Maximum Gain (60 DB) (Mic): -3 dB down at 16 Hz and -3 dB down 85 kHzCMRR (Mic): 91.8 dB (Channel 1, 1 kHz, maxiumum gain)
Input Impedance (Line): 10 kO from 10 Hz to 200 kHzGain Range (Line): -20 dB to 10 dB in 10 dB stepsNoise At Main Output With Gain At Unity (0 DB) (Line): -96 dBu measured with a 22 Hz / 22 kHz bandpass filterSignal To Noise Ratio Relative To Max (Line): 120 dBSignal To Noise Ratio Relative To 0dBFS( 22dBu) (Line): 118dBTHD At Unity Gain (0dB) (Line): 0.001 measured with a 0 dBu input signal and with a 22 Hz / 22 kHz bandpass filterFrequency Response At Unity Gain (0dB) (Line): 0.3 dB down at 10 Hz and -3 dB down at 122 kHz
Gain Range (Instrument): 10 dB to 40 dB continuously variableInput Impedance (Instrument): 1 MO or 300 kONoise At Minimum Gain ( 10 DB) (Instrument): -90 dBu measured with a 22 Hz / 22 kHz bandpass filterNoise At Maximum Gain ( 40 DB) (Instrument): -62 dBu measured with a 22 Hz / 22 kHz bandpass filterTHD At Minimum Gain ( 10 DB) (Instrument): 0.002 measured with a 10 dBu input signal and with a 22 Hz / 22 kHz bandpass filterFrequency Response At 10 DB Gain With -10 DB Input (Instrument): 10 Hz - 200 kHz /- 0.6 dBFrequency Response At 40 DB Gain With -40 DB Input (Instrument): -2.5 dB down at 10 Hz and 0 dB at 200 kHzRoll Off: 18 dB per octave 3 pole filterFrequency (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)
GTIN (UPC/EAN) : 815301005094
Manufacturer Part Number : ISA828