FOCUSRITE ISA 428 FOUR CHANNELS MIC PREAMPLIFIER

Overview:

The ISA 428 Pre Pack is the perfect multi-channel front end for any professional DAW.
Four classic Focusrite transformer-based pre amps with switchable impedance and direct
instrument inputs. An optional eight channel 192kHz ADC, preceded by the all new proprietory
Soft Limiter circuit, provides the perfect path into your Pro Tools HD system.
The benefits of the pre amp's topology include superb common-mode rejection, an excellent
overload margin and, with its shared gain structure (20dB from the hand-wound transformer and
up to 40dB from the amplifier), an extremely low noise floor and super-wide bandwidth (10Hz to
200kHz). This pre amp design is the cornerstone of Focusrite's signature 'warm-yet-transparent'
sound and is a point of reference for any discerning audio professional.
In addition, the input stage provides enhanced control and creativity allowing you to switch between
four carefully selected input impedance settings. The original ISA 110 setting is supplemented by
three further impedance settings to either perfectly match the pre amp with any microphone and
maximise level, or use different settings creatively to shape the sound of the microphone being used.
Should the need arise to place extra processing in between pre amp and conversion, insert points are
also featured on every channel.
Protecting the ADC, the Soft Limiter opto circuit is a new design from Focusrite, entirely preventing any
'digital overs', whilst minimising the undesirable distortion that standard limiter circuits often generate.
Finally, the new ADC embodies cutting-edge conversion technology, encompassed within pristine Focusrite
circuitry, providing eight conversion channels of the highest quality, at frequency rates of up to 192kHz.
Running at 96kHz allows for up to 16 (2 x 8, parallel) simultaneous digital outputs in addition to the four
main analogue outputs. Digital output options include dual AES/EBU, SPDIF and dual ADAT lightpipe.
Full digital metering is provided for every channel, alongside new 'moving coil' peak meters, designed to
catch even the fastest of transients.
A second analogue unit can be connected utilising the four extra ADC input channels on the rear of the unit
containing the optional ADC. This makes full use of the eight channels provided on a single optional ADC and
expands your front-end capacity from four pre amps and eight digital outputs to eight Pre amps and eight digital
outputs.
Classic preamp technology, custom Focusrite input and limiting circuits and the very best in A/D conversion
technology, the ISA 428 Pre Pack raises the bar for multi-channel recording solutions into Pro Tools HD, or any
other professional DAW. Equally, it can be used as an additional set of high quality pre amps for any analogue
or digital console or hard disk recorder.
Four classic Focusrite transformer-based preamps.
8 channels of cutting-edge A/D conversion, running at up to 192kHz. Protected by proprietory optical Soft Limiter
circuit.
Switchable Impedance for unparalleled mic matching or extended mic creativity - includes the classic ISA 110
setting.
Multiple Front Panel Instrument DI. No separate DI box required.
Analogue insert points on every channel.
High Pass Filters on every channel.
New moving coil peak meters & full digital metering (dBfs).

ADAT is a trademark of Alesis Corp
Pro Tools HD is a trademark of Avid Technologies plc.
The 192kHz ADC is an extra cost option.

Specifications
Inputs
Transformer-based ISA design
Gain range: Line = +/- 18dB, Mic = 0 to 60dB (both in 6dB steps), Inst = +10 to +40 dB
variable
Input impedance: Line = 10k ohm, Mic = Variable - 600, 2k4 and 6k8 ohm + original ISA 110
settings, Inst = >1M ohm

Analogue Performance
Noise: Line = -96dB, Mic = -128dB (EIN with 150 ohm input resistance at 60dB of gain)
THD: Line = 0.003% with 0dBu, 1kHz input and 20Hz to 22kHz band-pass filter, Mic = 0.003%

Analogue Input and Output connectors (balanced)
D.I inputs: 1/4 inch Jack (unbalanced)
Mic inputs: XLR (balanced)
Line: TRS Jack (balanced)
Insert Sends and Returns: TRS Jack (balanced)
Additional ADC inputs: XLR (balanced) Line level
Analogue Outputs: XLR (balanced)

Digital Output Option
AES/EBU and S/PDIF dual 9-pin D-types
Optical - ADAT Lightpipe
Bit depths 16-, 20- or 24-bit
Frequency options 44.1, 48, 88.2, 96, 176.4 and 192kHz
Clock options Standard or ?256 x?
Meter - 0 dBFS = +22dBu
Digital Performance
SNR - 120dB A-weighted

Applications

Console input extending for both Digital and Analog mixing
consoles in Studio, Live and Broadcast
Mic Pre-amps for ADAT/ Hard Disk/ Multitrack Recording
 
Innovation
If you love your compact Digital (or Analog) mixing console, but wish it had
more microphone inputs, ARX has the solution ? the 8 Pre: eight channels
of superb sounding Microphone Pre-amps in a compact 1 RU chassis.
The 8 Pre is the ideal console extender for those times when you need more
microphone inputs. Now you can put those unused line inputs to good use,
and who knows - the 8 Pre pre-amps sound so good that you?ll probably end
up using them all the time instead of the ones that came with your mixer!
Superb Audio Quality
The 8 Pre?s ultra low noise figures come from extensive use of premium
components plus care and attention to board design and layout. The result is
superb, transparent audio quality and the headroom to handle anything that a
mic can throw at it.
Gain is adjustable from 20 db through to 60 dB via a trim control on the front
panel, plus we?ve included a ?20dB Pad switch to tame the hottest condenser
mic output if required. The Clip status LED lights up 1 dB before the onset of
clipping, just to warn you you?re getting close.Phantom power is switchable in
banks of four channels: 1 through 4, 5 through 8. A Phase reverse switch is also
provided on each pre-amp channel to eliminate any close miking problems.
In short, the ARX 8 Pre is the mic Pre-amp that you?ll wish the console manufacturer
had used. It provides a unique solution to today?s multiple Mic Pre-amp requirements.

T E C H N I C A L S P E C I F I C A T I O N S
Input Gain 20dB to 60dB
Input Pad ?20dB
Input Impedance 4 KOhm
Input Headroom +23dB
Output Impedance 300 Ohm
Output Level (Max) +23dB
Frequency Response 20Hz ? 20KHz ±0.2 dB
Signal to Noise ratio (Gain set @ 20 dB)
?93dB Unweighted, ?99dB ?A? weighted
Distortion @ Unity Gain .004%, 20 Hz ? 10 KHz
Dynamic Range 116 dB
Phantom Power 48 VDC
Input Connectors Balanced XLR
Output Connectors Balanced TRS jack
Clip Indicator Illuminates 1 dB prior to clipping
Power Requirements 100/120 V AC, 220/240 V AC
Weight 5 lbs/2.2 Kg
Dimensions 19“W x 1?“H x 6“D, 482 x 44 x 155mm

The CPR12 is an easy to use, flexible and multifunctional 10 channel pre-amplifier. Six of these input channels are selectable between Mic / Line level and equipped with a 3 band tone control. The first two can be switched to priority and phantom power. The other four channels are direct line inputs.

Every input channel has its own gain and fader volume control with PFL button which makes it possible to pre-listen each input or output channel with the built-in pre-listening speaker, and can be routed to one or both output channels. This makes the CPR12 a full two-zone system.

Other present features are a priority input, a recording output, separate sub-out channels and the 24 V DC emergency power connection. This last feature makes it possible to power the CPR12 with emergency power when the main power is shut down. In this case, the priority input will automatically mute all input signals, and a evacuation message will be announced. The steel 19" housing has a height of 2 HE.

• 10 audio input sources
• 6 Mic / Line inputs with 3 band EQ
• 4 Direct Line Inputs
• Fader volume control
• Two output zones
• Built-in pre-listening speaker
• Priority input for emergency situations
• + 15 V DC Phantom power
• Works on 24 V DC emergency power
  

• Model Name / Type: CPR12 / 10 channel 2 zone pre-amplifier
• THD+N:
• Signal/Noise: > 90 dB
• Frequency Response: 20 Hz - 20 kHz
• Phantom Power: + 15 V DC
• Emergency Power: + 24 V DC
  
• Power Supply: 100 - 240 V AC / 50 - 60 Hz
• Dimensions (W x H x D): 420 x 88 x 320 mm

• Maximum of 66 dB of gain, in eleven discrete steps
• Dynamic range exceeding 120 dB
• 10 Hz to 50 kHz audio bandwidth
• High immunity to RF interference
• High current line output driver
• Transformer-balanced input and output
• Extended range peak limiter via dual opto-isolators makes preamplifier virtually "unclippable“
• Selectable 48-volt / 12-volt phantom power or 12-volt "T" power
• High-pass filter @ 80 or 160 Hz, 6 dB per octave
• Headphone monitoring of microphone audio, monitor audio, or a mix of both
• Monitor input accepts mono, balanced or unbalanced line-level inputs on 1/4-inch tip-ring-sleeve connector
• Separate level control of Monitor gain and overall headphone gain
• Split ear function via DIP switches
• Internal battery power (two-AA)
• Excellent battery life with alkaline and NiMH rechargeable batteries
• External 5-17 VDC powering (plug included)
• High-strength aluminum chassis with durable belt clip

The PRE-73 Mk2 pre-amp and the FC3 condenser microphone in one bundle. The bundle also includes Golden Age P1 Pop Filter, Proel RSM180 mic stand and Proel CHL250 5m cable.