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Home > Products > Audio / Visual > Focusrite ISA428 PRE PACK - 8-Channel 4-Mic Pre Amps



Focusrite ISA428 PRE PACK - 8-Channel 4-Mic Pre Amps
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Focusrite ISA428 PRE PACK - 8-Channel 4-Mic Pre Amps


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Focusrite ISA428 PRE PACK - 8-Channel 4-Mic Pre Amps



BRAND: Focusrite
QUICKFIND: tei491264002107
WEIGHT: N/A

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RMSP: £1,644.00 inc VAT

£1,216.00 ex VAT
£1,459.20 inc VAT


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Product Description:


   ISA428 Pre Pack Four classic microphone pre-amplifiers
   and high-quality A-D conversion

     

 

 

Key Features

 
Four ISA-series transformer-based pre-amps
The benefits of Focusrite’s classic pre-amp topology include superb common-mode rejection, an excellent overload margin, an extremely low noise floor and super-wide bandwidth.

Dedicated analogue insert points
Switchable insert points are also featured on every channel, allowing routing (between pre-amp and output) to additional external processing.

Accurate ‘moving coil’ peak meters
Clear metering designed to catch even the fastest and most elusive of transients.

Four front panel instrument inputs
Instant access on the front fascia and no separate DI box required.

Eight line inputs
Four additional A-D converter inputs combine with the four pre-amp inputs to provide eight line inputs, routable discretely to the eight-channel A-D converter option.

Eight Channel optional 192kHz A/D conversion card
With the additional four ADC inputs, two ISA428’s can be used with a single ADC, providing eight channels of pre-amplification, A-D conversion and VU metering.

Custom Global A-D converter ‘soft clip’ limiter
Focusrite’s custom optical design protects the A-D converter by preventing ‘digital overload’. It requires that an A-D converter be installed.

Switchable Impedance
Ideal for mic matching or extended microphone creativity. Settings include the ‘Vintage ISA110’ setting, providing the original Focusrite signature sound.

Variable Focusrite high pass filter
Provided on every channel, this is the same filter as featured on the original ISA110 and the Focusrite forte console.

The ISA Pre

 
The ISA Pre
 
The ISA microphone pre-amplifier was first introduced back in 1985. This transformer-based pre-amplifier formed the first half of the ISA110 mic-pre and EQ module on Focusrite's critically acclaimed Forte console. This console, and the later Studio console were hailed by many as the finest sounding consoles ever built.

The ISA microphone pre-amplifier went on to form the cornerstone of all ISA and RED Focusrite products. The topology has never changed, except for the addition of a variable impedance circuit, allowing ISA users to either perfectly match the pre-amp with any microphone, thus maximizing level, or to use different settings creatively to shape the sound of the microphone being used. The original ISA110 setting was supplemented by three further impedance settings.

The Focusrite pre amp is renowned for its transparency, but there's also that subtle warmth that transformer core saturation contributes. This seeming contradiction of warmth plus beautifully open, unrestricted high frequencies, is a classic hallmark of the mid 80's Focusrite designs.
 
With processors whose bandwidth is strictly limited to the audible (20Hz to 20kHz) bandwidth alone, significant roll-off can still occur, affecting the higher audible frequencies of the signal. Therefore, in order to capture every subtle nuance, exactly as it occurs whilst avoiding any roll-off, the pre-amp must operate over a far greater bandwidth. The extremely broad frequency response of Focusrite pre-amps - close to 200kHz at the top end - guarantees accurate phase response across the much narrower range of human hearing, the roll-off point being moved entirely outside of the audible hearing range.

All critical inputs are transformer-coupled, providing a dual gain structure - an expensive option, but the optimum route to high quality signal handling. Focusrite use Lundahl LL1538 transformers.

Also originally employed was a 'Zobel network' to counteract the reactance of the primary coil of the transformer. A Zobel network is a damping circuit that is applied across the secondary of the mic input transformer. This damping network tailors the naturally occurring high frequency resonant point of the input transformer. The Zobel network featured in ISA and RED pre amps was set by ear, has never changed, and as such is a key contributor to the Focusrite sound.

Finally, all the components featured in the ISA pre-amp were always chosen with a specific frequency response in mind. Rather than accepting the effect of the components chosen, the designer worked diligently with the values of every component in a relentless effort to achieve the desired response.

Overview

 
The ISA features four classic, transformer-based microphone pre amps with switchable impedance and direct Instrument Inputs are combined with an optional eight channel 192kHz ADC. An all-new, Soft Limiter circuit precedes the A/D, providing the perfect path into any DAW, Digital Console or direct to Hard Disc Recorder.

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 to use different settings creatively to shape the sound of the microphone being used. Should the need arise to place extra processing between pre-amp and conversion, insert points are also featured on every channel.
Protecting the ADC, Focusrite's Soft Limiter is a new optical circuit design, entirely preventing any digital overs, whilst reducing to an absolute minimum the undesirable distortion artefacts that common limiter circuits typically generate. This limiter requires the optional ADC to be fitted in order for it to operate.

The ADC embodies cutting-edge conversion technology, encompassed within Focusrite circuitry, providing eight high quality conversion channels, at sampling frequency rates of 44.1, 48, 96 and 192kHz. Running at 96kHz allows for up to 16 (2 x 8, parallel) digital outputs. Digital output formats are dual 9-pin D-sub (AES/EBU, SPDIF) and dual ADAT light-pipe.

Full digital metering is provided for every channel, alongside moving coil peak meters, designed to catch even the fastest transients.

A second ISA428 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 and expands front-end capacity from four pre amps and eight digital outputs to eight Pre amps and eight digital outputs.

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

Weight
• 7.36kg
• 16.2Ibs

Dimensions
• 484mm (W) x 85mm (H) x 250mm (D)
• 19" (W) x 3.5" (H) x 9.8" (D)
 








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Focusrite ISA428 PRE PACK - 8-Channel 4-Mic Pre Amps

Focusrite ISA428 PRE PACK - 8-Channel 4-Mic Pre Amps  MRSP: £1,644.00 inc VAT
£1,216.00
£1,459.20 inc VAT







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