A High-quality, Affordable Mic Preamp with Signature Focusrite Sound!
The Focusrite ISA 828 microphone preamp puts eight of Focusrite's original ISA preamps into a compact 2U space, giving you amazing sound quality in a unit that's convenient for both your studio and your wallet. The ISA 828 gives you a variable impedance circuit with several settings, and also includes eight line/four instrument inputs with high and low impedance options. Using 25-pin D-type connectors, this preamp is easy to interface with Pro Tools HD rigs, as well as many other recording systems and mixing consoles. Get the best for less! Plug into an ISA 828.

A remarkable, affordable preamp
The ISA 828 features eight original ISA transformer-based pre amps in a single robust 2U chassis, and offers the Focusrite signature sound at the lowest cost per channel to date. The eight ISA-series transformer-based microphone pre amps feature exactly the same vintage microphone pre-amplifier design as the original ISA110 module from Focusrite's critically acclaimed Forte console (including the original Lundahl L1538 transformer).

Line inputs, easy DAW integration
The pre-amps are complemented by eight line inputs, four instrument inputs. Thanks to its convenient 25 pin D-Type connectors, the ISA 828 also integrates quickly and seamlessly with ProTools HD, as well as other popular hard disk recorders and mixing desks.

Variable impedance
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 perfectly match/creatively mismatch the pre amp with any microphone collection. The four front panel instrument inputs also feature high and low impedance options to provide a comprehensive and accessible DI solution. Insert switches 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.

Focusrite ISA 828 Microphone Preamp Features:

• Eight ISA series transformer-based pre amps
  In a single robust 2U chassis, offering the classic Focusrite pre at its lowest cost-per-channel to date.
• New Optional Eight Channel 192kHz ADC
  Embodies cutting-edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A/D performance on the market, bar none
• Convenient 25 pin D-Type connectors
  The ISA828 integrates quickly and seamlessly with ProTools HD, as well as other popular hard disk recorders and mixing desks.
• Switchable Impedance
  Selectable per channel; choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphone.
• Direct Instrument inputs
  Each instrument input features high and low impedance options to provide a comprehensive and accessible DI solution.
• Inserting available on every channel
  Allows external devices to be inserted between the pre amp and the ADC, using the 25-pin D-type cable.
• High pass filter, Phase reverse and Phantom power
  Each has a dedicated switch, independent on each channel.
• Six LED input meter
  Complete with precise meter trim - Designed to utilise the same reference points as Digidesign’s HD™

Mic Input Response
• Gain range: 0dB to 60dB in 10dB steps
• Input Impedance, variable: 600?, 1k4?, 2k4?, 6k8?
• EIN (equivalent input noise): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz bandpass filter
• Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (9dBu): 106dB
• THD at medium gain (30dB): 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency response at minimum gain (0dB): -0.5dB down at 10Hz and –3dB down at 110kHz
• Frequency response at maximum gain (60dB): –3dB down at 16Hz and –3dB down 85kHz
• CMRR: 91.8dB (Channel 1, 1kHz, maxiumum gain)
• Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA

Line Input Response
• Gain range: -20dB to +10dB in 10dB steps
• Input Impedance: 10k? from 10Hz to 200kHz
• Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (24dBu): 120dB
• Signal to noise ratio relative to 0dBFS(+22dBu): 118dB
• THD at unity gain (0dB): 0.001% measured with a 0dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at unity gain (0dB): 0.3dB down at 10Hz and –3dB down at 122kHz

Instrument Input Response
• Gain range: 10dB to 40dB continuously variable
• Input Impedance: 1M? or 300k?
• Noise at minimum gain (+10dB): -90dBu measured with a 22Hz/22kHz bandpass filter
• Noise at maximum gain (+40dB): -62dBu measured with a 22Hz/22kHz bandpass filter
• THD at minimum gain (+10dB): 0.002% measured with a 10dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at 10dB gain with -10dB input: 10Hz-200kHz +/- 0.6dB
• Frequency Response at 40dB gain with -40dB input: -2.5dB down at 10Hz and 0dB at 200kHz

High Pass Filter
• Roll off: 18dB per octave 3 pole filter
• Fixed Frequency 75Hz measured at the 3dB down point

Weight
• 8.84kg

Dimensions
• 484mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink)
• 19" (W) x 3.5" (H) x 12" (D) (13.8" depth with heat sink)

Brochure

Manual