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Focusrite ISA 828 Eight Channel Microphone Preamp with Optional A-D Converter
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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. 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.
Focusrite ISA 828 Microphone Preamp Features:
- 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.
Focusrite ISA 828 Specifications:
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)
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
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 x 85mm x 305mm (350mm depth with heat sink)
Dimensions (W x H x D): 19" x 3.3" x 12" (13.7" depth with heat sink)
Each ISA 828 Retail Box Includes:
(1) Focusrite ISA 828 Eight Channel Microphone Preamp with Optional A-D Converter
(1) Printed User Guide in English, French and German