Focusrite ISA 828 MkII - 8 Channel Classic ISA Mic Preamp/DI
Focusrite ISA 828 MkII - 8 Channel Classic ISA Mic Preamp/DI
The Focusrite ISA 828 MkII incorporates eight of Focusrite's classic mic preamps, with Lundahl LL1538 transformers on every input. Each channel has the option of mic or line inputs, while inputs 1-4 also feature instrument inputs on the front panel. Each mic pre has variable input impedance, to provide a range of subtly different sonic options when using microphones, including an 'ISA 110' setting, which replicates the impedance of the original Focusrite mic pre.
Up to 60dB of gain is available, with a further +20dB of continuously variable trim, providing a huge 80dB gain range. The high-pass filter has a fixed 75Hz frequency and 18dB / octave roll-off for minimising rumble, stand-borne noise and other low-frequency sounds. The ISA 828 MkII also features per-channel, six-segment LED meters, and switchable rear-panel insert points, which allow the use of inline processors such as compressors or EQs.
Focusrite ISA 828 MkII Features:
- Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
- Switching power supply design allows for efficient and cool operation
- Front-panel instrument inputs to the first four channels offer two impedance options: High (2.4 MΩ) and Low (470 kΩ)
- 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
- Calibratable, per-channel six-segment LED peak-level meters
- Optional A-D card with up to 192kHz, 24-bit sampling offers high-quality, precision digital audio conversion to Dante, ADAT and AES3 (sold separately)
Specifications
Mic inputs
- Gain Range0dB to +30dB (30-60 switch disabled) and +30dB to +60dB (30-60 switch enabled) in 10dB steps, with an additional +20dB of continuous trim
- Input ImpedanceLow = 600Ω, ISA 110 = 1400Ω, Med (Medium) = 2400Ω, High = 6800Ω
- Max. Input Level+7dBu, min gain, medium Z
- Frequency Response (20Hz - 20kHz)20Hz - 20kHz ±0.2dB, min gain, medium Z
- THD + N-91dB (0.0028%) @ -1dBr, min gain, medium Z
- EIN-123dBu 'A'-Weighted (typical)
- Signal-To-Noise Ratio122dB 'A'-Weighted (typical), medium Z
- Common-Mode Rejection Ratio997Hz CMRR: -93dB, min gain, medium Z
- Phantom Power+48V, independently switchable per channel
- High-Pass Filter75Hz knee frequency, 18dB/Octave, independently switchable per channel
- PhaseInverts the phases of the selected input
- Frequency Response (10Hz - 110kHz)10Hz - 110kHz ±1.5dB, min gain, medium Z
Line inputs
- Gain Range20dB to +10dB in 10dB steps, with an additional +20dB of continuous trim
- Input ImpedanceLow = 600Ω, ISA 110 = 1400Ω, Med (Medium) = 2400Ω, High = 6800Ω
- Max. Input Level+25dBu, min gain, low Z
- Frequency Response (20Hz - 20kHz)20Hz - 20kHz ±0.1dB, min gain, low Z
- THD + N-91dB (0.0028%) @ -1dBr, min gain, low Z
- Signal-To-Noise Ratio122dB 'A'-Weighted (typical), min gain, low Z
- Frequency Response (10Hz - 122kHz)10Hz - 122kHz ±3dB, min gain, low Z
Instrument inputs
- Gain Range+10dB to +40dB with continuous gain using trim pot
Front panel connectivity
- Channel Count2 Channels In
- Instrument Inputs4 x 1/4" jack inputs
- Instrument Inputs4 x 1/4" jack inputs
Rear panel connectivity
- Mic InputsInput: 8 x Female XLR
Line level
- Channel Count8 In and 8 Out
- Input8 x 1/4" jack inputs
- Output1 x DB-25 connectors (AES59)
Inserts
- Channel Count8 In
- Input1 x DB-25 connectors (AES59)
Digital card slot
- Compatible CardISA ADN8
Front panel indicators
- Control Functions16 x Pots (Gain and Trim). 60 Switches (On/Off Switch, 30-60 Gain, +48V, Phase, HPF, Insert, Z In, Input, Meters Pre A-D, Clock Select and Ext. Word Clock)
Rear panel indicators
- Control Functions1 x Pot (Meter Trim)