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Focusrite ISA 828 MkII is an eight-channel transformer microphone preamp based on the ISA 110 module, with four switchable input impedances, inserts, instrument inputs and a slot for the optional ISA ADN8 A-D card with Dante.
Eight channels of ISA 110 sound for tracking a whole band.
Overview
Sharing the simple mic preamp design of the original Focusrite ISA 110 module from the Focusrite Studio Console, 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 features variable cut-off frequency between 16 and 420Hz. ISA 828 MkII features high-pass filters, calibratable per-channel, six-segment LED meters, and switchable rear-panel insert points, which allow the use of inline processors such as compressors or EQs.
Dedicated connectors for mic and line-level inputs allow all sources to be connected simultaneously, making ISA 828 MkII perfect for permanent installation in a rack. New to the ISA 828 MkII is an updated power supply that allows for more efficient power consumption, a reduction in heat generation, and extremely reliable operation. The optional ISA ADN8 analogue-to-digital expansion card provides eight Dante, ADAT and AES3 outputs at rates of up to 24-bit/192kHz.
ISA 828 MkII at a Glance
| Gain Range | 0dB 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 Impedance | Low = 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 Ratio | 122dB 'A'-Weighted (typical), medium Z |
| Common-Mode Rejection Ratio | 997Hz CMRR: -93dB, min gain, medium Z |
Who Is the ISA 828 MkII For?
Commercial and project studios that want ISA preamps on every channel.
ISA 828 MkII Specifications
| Mic inputs | |
| Gain Range | 0dB 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 Impedance | Low = 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 Ratio | 122dB 'A'-Weighted (typical), medium Z |
| Common-Mode Rejection Ratio | 997Hz CMRR: -93dB, min gain, medium Z |
| Phantom Power | +48V, independently switchable per channel |
| High-Pass Filter | 75Hz knee frequency, 18dB/Octave, independently switchable per channel |
| Phase | Inverts the phases of the selected input |
| Frequency Response (10Hz - 110kHz) | 10Hz - 110kHz ±1.5dB, min gain, medium Z |
| Line inputs | |
| Gain Range | 20dB to +10dB in 10dB steps, with an additional +20dB of continuous trim |
| Input Impedance | Low = 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 Ratio | 122dB '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 Count | 2 Channels In |
| Instrument Inputs | 4 x 1/4" jack inputs |
| Instrument Inputs | 4 x 1/4" jack inputs |
| Rear panel connectivity | |
| Mic Inputs | Input: 8 x Female XLR |
| Line level | |
| Channel Count | 8 In and 8 Out |
| Input | 8 x 1/4" jack inputs |
| Output | 1 x DB-25 connectors (AES59) |
| Inserts | |
| Channel Count | 8 In |
| Input | 1 x DB-25 connectors (AES59) |
| Digital card slot | |
| Compatible Card | ISA ADN8 |
| Front panel indicators | |
| Control Functions | 16 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 Functions | 1 x Pot (Meter Trim) |
Why Focusrite?
Focusrite is a British pro audio company whose ISA preamp design goes back to the Focusrite Studio Console. Its Scarlett, Clarett+, Vocaster, ISA, Red and RedNet ranges cover everything from a first home recording to Dante networks in broadcast and professional studios.
Frequently Asked Questions
Can it output digitally?
Yes, with the optional ISA ADN8 card, which adds Dante, AES3 and ADAT.
How many impedance settings are there?
Four: Low, ISA 110, Medium and High.
Is this a genuine Focusrite product?
Yes. Victory is a veteran owned dealer and units ship new in original packaging.
Is it covered by a warranty?
Yes. It is covered by the Focusrite manufacturer warranty.
Why Victory Musical Instruments?
Victory Musical Instruments ships Focusrite interfaces, preamps and Dante equipment nationwide with free shipping. For help choosing an interface or planning a system, call 844-687-4208.