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The Focusrite Heritage Sound - in a versatile, transportable package
Back in the mid-1980s, Sir George Martin commissioned console design legend Rupert Neve to build a series of new, ‘no compromise’ console modules for AIR studios. They were an enormous hit and formed the basis of the Focusrite Studio Console, widely regarded as the best-sounding analogue recording console of all time. Today, the descendants of those modules are used in leading studios around the world, and their sought-after Focusrite Heritage Sound lies behind thousands of hit records. Today’s ISA Range from Focusrite puts the classic sound of Focusrite into your own studio or live performance.
Classic Focusrite transformer-based mic preamplifier
At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer – essentially the same circuit, based on the original ISA110, that has been used for 30 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can’t be truly emulated in any other way: inseparable from the microphone itself, the transformer input stage is ideal for use with classic microphones. But this mic pre has a twist the original didn’t have, which makes it far more versatile: four carefully-selected impedances allow you to match microphone to input in different ways. Bring out the character of a classic mic or emphasise a special feature, or go for a totally transparent, modern sound – it’s up to you.
Independent direct input
Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the ISA One, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A/D converter and separate rear-panel XLR output
Multimedia
Key Features
ISA series transformer-based preamplifier
Encased in a rugged and portable chassis, ISA One offers the classic Focusrite microphone preamplifier at its lowest cost to date.
Flexible independent DI channel
ISA One is ideal for both engineers and demanding performers alike, featuring independent gain control, an output for routing to an amp, an independent XLR output on the rear and routing to the optional A-D converter.
Switchable impedance
Choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphone.
Headphone output with volume control
ISA One can feed either a sum of the two input to the headphones output, or an external stereo cue mix (such as a stereo feed from an interface) via two TRS jack inputs on the rear of the unit.
Dedicated insert point
Allows you to place extra processing between the preamplifier or DI and the optional converter, such as an EQ or compressor.
Optional stereo 192kHz A-D converter
You can chose to upgrade your unit with an optional digital card that delivers the best A-D performance in its class (dynamic range of 118dB). Alternatively, the ISA One Digital comes with the A-D converter as standard.
Lundahl LL1538 Input Transformer
The original mic transformer used in the original Red modules helps to provide the unique sound and performance of this groundbreaking design.
Backlit VU meter with variable calibration
ISA One has a moving coil VU meter with variable calibration to suit analogue and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert.
Specifications
Analog inputs
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Analog outputs
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Additional analog inputs and outputs
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Mic input
| Gain range | 0 dB to 60 dB in 10 dB steps and +20 dB adjustable gain | |
| Input Impedance | Connected impedances. Equivalents of input impedance at 1 kHz | Low = 600 Ohm ISA110 = 1.400 Ohm Med = 2.400 Ohm High = 6.800 Ohm |
| ON (Equivalentes input noise) | -126 DB, measured at 60 dB gain with 150 Ohm impedance and 22 Hz / 22 kHz bandpass filter | |
| Murmur | Output noise with 0 dB gain and 22 Hz / 22 kHz bandpass filter | -97 DBu |
| Gerauschspannungsabstand (SNR) | 106 dB, relative to the maximum headroom (9 dBu) | |
| Total-Harmonic-Distortion + Rauschen | Measured at average gain (30 dB) at 1 kHz -20 dBu input signal and 22 Hz / 22 kHz bandpass filter | <0.0009% |
| Frequency response | At minimum gain (0 dB) | -0.5 DB at 10 Hz and -3 dB at 125 kHz |
| At maximum gain (60 dB) | -3 DB at 16 Hz and -3 dB at 118 kHz | |
| CMRR (Common Mode Rejection Ratio) | 98 dB (Channel 1, 1 kHz, maximum gain with +24 dBu input) | |
| However, channel-to-channel crosstalk | With 10 dB @ 1 kHz input to channel A, channel B output = 104 dbra. With 10 dB @ 10 kHz input to channel A, channel B output = 84 dbra | |
Line input
| Gain range | -20 DB to 60 dB in 10 dB steps and +20 dB adjustable gain | |
| Input Impedance | 10 kO from 10 Hz to 200 kHz | |
| Noise | Noise Main.Ausgang with gain (0 dB) measured by 50 O source impedance and 22 Hz - 22 kHz bandpass filter | -96 DBu |
| Gerauschspannungsabstand SNR | Gemessen it 22 Hz - 22 kHz Bandpass-Filter |
120 dB relative to the maximum headroom (24 dBu) 118 dB relative to 0 dBFS (+22 dBu) |
| THD and noise | Measured with 0 dB input signal and 22 Hz-22 kHz bandpass filter | 0,0001 % |
| Frequency response | At 0 dB gain | -0.3 DB at 10 Hz and -3 dB at 200 kHz |
Instrument input
| Gain range | Adjustable from 10 dB to 40 dB | |
| Input Impedance | High = grˆfler als 1 M Low =grafler als 300 k |
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| Murmur | Measured with 22 Hz-22 kHz bandpass filter |
Minimum Gain (+10 dB): -92 dBu Maximum Gain (+ 40dB): -62 dBu |
| THD | At minimum gain (+10) | |
| Frequency response | At minimum gain (+10 dB) | -10 DB input: 10 Hz - 100 kHz +/- 0.6 dB |
| At maximum gain (+40 dB) | -40 DB Input: -2.5 dB at 10 Hz and 100 kHz 0 dB | |
Show
| Coil-level display (MC) | Factory calibrated to 0 VU = +4 dBu at 1 kHz sine wave. In gedr¸cktem VU Cal switch on the back of the display can be changed ‰ ge, so 0 VU +10 dBu to +26 dBu match.The central point corresponds to +22 dBu. | |
| Peak-LED-Anzeige | Calibrated in the position for 0 dBFS = +22 dBu. The cali- bration can be changed on the back ge ‰, so that 0 dBFS correspond dBu to +26 dBu equal to +10 | |
| MC and Peak1 display can be tapped after the high-pass filter, either before the insert send or behind the insert return. Peak2 is always picked up before the A / D converter channel 2, which is fed from the external input or the instrument input. | ||
| LED level | As follows when the peak calibration is on the back in a central position. (When using the internal A / D converter). |
0 = +22 dBu -2 = +20 dBu -6 = +16 dBu -12 = +10 dBu -18 = +4 dBu -42 = -20 dBu |
| Frequency response | At minimum gain (+10 dB) | -10 DB input: 10 Hz - 100 kHz +/- 0.6 dB |
| At maximum gain (+40 dB) | -40 DB Input: -2.5 dB at 10 Hz and 0 dB at 100 kHz | |
Hochpass-Filter
| Roll-Off | 18 dB per octave (3-pole filter) |
| Frequency | 75 Hz fixed, at 3 dB down point |
Weight and dimensions
| B x T x H | 220 mm (W) x 104 mm (H) x 254-290 mm (T - top to bottom) |
| Weight | 3,9 kg |
