Focusrite ISA One Classic Single Channel Mic Pre
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Classic vintage microphone preamplifier at a groundbreaking price.
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 hundreds of hit records. Today™s ISA Range from Focusrite puts the classic sound of Focusrite into your own studio or live performance.
Featuring a rugged, portable all-metal enclosure, the ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A/D conversion.
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.
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.
- ISA Series Transformer-based Preamplifier
- Flexible Independent DI Channel
- Switchable Impedance
- Headphone Output with Volume Control
- Dedicated Insert Point
- Optional stereo 192kHz A-D converter
- Lundahl LL1538 Input Transformer
Now you can afford to go high end in your studio. Order today.
ISA One Classic Single Channel Mic Pre Specifications:
- Mic Input Response
Gain range: 0dB to 60dB in 10dB steps + 20 dB of variable gain
Input Impedance, variable as follows:-
(Switched Impedance setting Equivalent Input Impedance at 1kHz)
Low: 600 Ohms
ISA110: 1400 Ohms
Med: 2400 Ohms
High: 6800 Ohms
EIN (equivalent input noise): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz/22kHz band-pass filter
Signal to noise ratio relative to max headroom (9dBu): 106dB
THD at medium gain (30dB): 0.0009% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz band-pass filter
Frequency response at minimum gain (0dB): -0.5dB down at 10Hz and -3dB down at 125kHz
Frequency response at maximum gain (60dB): -3dB down at 16Hz and -3dB down 118kHz
CMRR=98dB (Channel 1, 1kHz, maximum gain with +24 dBu input)
Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output:104dBrA. With 10dB@10kHz input to chA, chB output: 84dBrA
Line Input Response:
Gain range: -20dB to +10dB in 10dB steps + 20 dB of variable gain
Input Impedance: 10kΩ from 10Hz to 200kHz
Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz/22kHz band-pass 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 band-pass filter
Frequency Response at unity gain (0dB): -0.3dB down at 10Hz and -3dB down at 200kHz
Instrument Input Response
Gain range: 10dB to 40dB continuously variable
High: greater than1MΩ
Low:greater than 300kΩ
Noise at minimum gain (+10dB): -92dBu measured with a 22Hz/22kHz band-pass filter
Noise at maximum gain (+40dB): -62dBu measured with a 22Hz/22kHz band-pass filter
THD at minimum gain (+10dB): 0.001% measured with a 10dBu input signal and with a 22Hz/22kHz band-pass filter
Frequency Response at 10dB gain with -10dB input: 10Hz-100kHz +/- 0.6dB
Frequency Response at 40dB gain with -40dB input: -2.5dB down at 10Hz and 0dB at 100kHz
High Pass Filter
Roll off: 18dB per octave 3 pole filter
Fixed Frequency 75Hz measured at the 3dB down point
Moving coil (MC) meter is factory calibrated to 0VU: +4dBu with 1kHz sinewave. With the VU Cal button pressed the meter can be adjusted on the rear panel to allow 0VU to equal +10dBu to +26dBu with the centre detent being equal to +22dBu.
Peak LED meters calibrated in the detent position for 0dBFS: +22dBu, calibration is adjustable on the rear panel to allow 0dBFS to equal +10dBu to +26dBu
Routing for MC and Peak1 meter is after the HPF, pre insert send or switched post insert return. Peak2 is always pre ADC channel 2, which can be fed by external input or Instrument input.
LED levels are as follows when peak calibration is set to center detent on the rear panel. (This is when using the internal ADC).
FRONT AND REAR CONNECTIVITY:
Analog Channel Inputs:
Mic input: XLR x 1
Line input: XLR x 1 and TRS x1
Instrument input TRS Jack: XLR x 1
External ADC input: TRS Jack x 1
Return: TRS Jack x 1
Analog Channel Outputs:
Send: TRS Jack x 1
Balanced line output: XLR x 1
DI output: XLR x 1
DI through: TS Jack x 1
Analog Channel Additional I/O:
Cue mix left input: TRS Jack x 1
Cue mix right input: TRS Jack x 1
Headphones output: º" TRS Jack x 1
8.6 Ib. (3.9 kg)
Dimensions(H x W x D)
8.66" x 4.1" x 10" - 11.4", (220mm x 104mm x 254 - 290mm)
ISA Stereo ADC (compatible with ISA 430 MKII and ISA One)ISA Stereo ADC (compatible with ISA 430 MKII and ISA One)
REVIEW SNAPSHOT®by PowerReviews
Reviewed by 1 customer
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- Clear Sound
- Easy To Use
- Only One Channel
- Amateur Recording
- Home Studio
- Professional Recording
Comments about Focusrite ISA One Classic Single Channel Mic Pre:
When it come to great pre's the Isa one is at the top of the line, the sound quality is excellent, the functionality makes it very user friendly, and the versatility allows many insert to be connected.