Focusrite ISA828 Eight Channel Microphone Preamp

Eight Channel Mic Pre And Optional A-D

The Focusrite AMS-ISA828 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.

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

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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): 84mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink)