The ISA828 eight channel microphone pre-amplifier provides eight original ISA transformer-based pre amps in a single robust 2U chassis,offering the Focusrite signature sound at its lowest cost per channel to date.

The eight ISA-series transformer-based microphone pre amps feature the same classic microphone pre-amplifier design as the original ISA110 module from Focusrite’s critically acclaimed Forte console (including the original Lundahl L1538 transformer and bespoke zobel network).

The pre-amps are complemented by eight line inputs, eight line outputs and an optional eight channel 192kHz ADC boasting the widest dynamic range of any converter to date. Thanks to its convenient 25 pin D-Type connectors, the ISA828 also integrates quickly and seamlessly with ProTools HD, as well as other popular hard disc recorders and mixing desks.

The microphone input stage additionally includes a variable impedance circuit, allowing the user to switch between four carefully selected input impedance settings. The original ISA110 setting is supplemented by three further impedance settings 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 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 75 Hz / 18dB per octave high pass filters are also provided on every channel, ensuring unwanted low frequencies are effectively eliminated.

The ISA828’s new optional eight-channel 192kHz ADC is the first audio ADC to utilise Texas Instruments Burr-Brown Pro Audio Amplifiers and Flagship Analog to Digital Converter PCM4220 chips. This cutting-edge technology is encompassed within Focusrite’s own custom analogue circuitry to provide eight channels of unparalleled A/D conversion, delivering a dynamic range of 122dB and jitter at less than 250 picoseconds.

Finally, every channel features a six LED input meter, complete with global precise meter trim. Metering has been designed to utilise the same reference points as Digidesign’s Pro Tools HD™ system and provides clear and accurate input metering, independent of the DAW.

The Aphex Model 188 houses eight high-quality mic preamps in a single 1U rackmountable chassis. Like the company’s popular 1788A, all settings of the Model 188 may be remote controlled via Ethernet or MIDI, using Aphex’ 1788A-RC hardware remote or the 1788SW control software (PC and Mac), or via Pro Tools®.

The Model 188 has one analog output as well as two ADAT Optical outputs, each carrying eight channels of audio. The two outputs may be used for redundant operation, or to combine for higher sampling rates (SMUX).

Unlike the 1788A, the Model 188 does not have the extensive onboard metering, nor does it include Aphex’ exclusive MicLim™ technology which limits the signal at the mic input. However, the 188’s 1U rackmount chassis makes it ideal for mobile systems with space limitations, and it consumes less power than the 1788A.

Transformer coupled inputs
Balanced analog outputs
2 ADAT outputs
Internal clock: 44.1, 48, 88.2, 96kHz
External clock input from 44.1 to 96kHz
Word clock output
Automatic ADAT SMUX output for 88.2 and 96kHz
Selectable SMUX for 44.1 and 48kHz
65dB total gain, 26dB fixed gain, 39dB variable gain
26dB Pad
Polarity reverse
Low cut filter @ 80Hz
Max output level +21dBu
EIN: -125dBu

Front panel control:
Remote control through PC or MAC software; 1788A Remote Controller MIDI, Yamaha and ProTools protocol.
Aphex_188_User_Manual