Focusrite ISA One Digital Single-Channel Mic Preamp

Focusrite ISA One Digital

  is a single channel, transformer-based microphone preamp. ISA One Digital is the perfect preamp for singer/songwriters, thanks to its independent mic pre and DI signal paths and, with its 192kHz digital outputs, it can transform any audio interface with a digital input into a truly professional DAW front end.

Focusrite ISA One Digital's mic pre features Focusrite's classic Transformer- based circuitry, which gives you the sound made famous by the Forte console in your home or project studio. The preamp's switchable impedance includes an ISA 110 setting, to accurately emulate the classic Focusrite front end, and there's a dedicated insert point, to add further processing into the signal chain. The unit also features a headphone output with a stereo cue mix input — so you can monitor signals from your DAW — and comprehensive metering provides accurate visual feedback.

Focusrite ISA One Digital's preamp gives you the authentic sound of the Focusrite Forte console in an ultra-portable format. Inputs for microphone, line-level, and instrument-level sources cover all of the bases. A variable impedance selector lets you dial in the warmth you want without sacrificing the clarity you need. What's really cool is that the ISA One Digital's instrument and microphone inputs run in parallel, so you can blend the direct signal of the instrument with the sound of the miked up amplifier - a killer trick for getting bass sounds that are both fat and punchy. Add to that the ISA One Digital's preinstalled A/D converter, which is capable of outputting up to 24-bit/192kHz digital output, and you have the perfect companion piece to your audio interface.

• Classic single-channel Focusrite microphone preamp with independent DI
• Includes rugged custom flight case, built to protect the ISA One from the rigors of the road. Rugged plywood construction with a solid polypropylene exterior and reinforced corners
• Selectable impedance, perfect for matching with any microphone
• Instrument inputs, with high- and low-impedance options
• Classic VU meter and modern ladder LED meter
• Cue mix stereo inputs
• Certificate of origin hand signed by Phil Dudderidge included
• 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 ADC
• Headphone output with volume control can feed either a sum of the two inputs to the headphones output, or an external stereo cue mix (such as a stereo mix feed from an interface) via two TRS Jack inputs on the rear of the unit
• 24-bit/192kHz A/D converter card preinstalled

Number of Channels
Single

Inputs
1 x XLR Microphone
1 x XLR Line
1 x 1/4" TRS phone Line
1 x 1/4" TRS phone Instrument
1 x 1/4" TRS phone External Input
1 x 1/4" TRS phone Cue Left
1 x 1/4" TRS phone Cue Right
1 x 1/4" TRS phone Return
1 x BNC Wordclock

Output
1 x XLR Line
1 x XLR DI
1 x 1/4" TS DI Thru
1 x 1/4" TRS phone Send
1 x 1/4" TRS phone Headphone
1 x TOSLink optical S/PDIF
1 x TOSLink ADAT Lightpipe
1 x BNC Wordclock
1 x DB9-pin (AES and S/PDIF out on optional breakout cable

Phantom Power
48V

Multi Function
Analog-to-Digital converte

Gain Range
Microphone: 0dB to 60dB in 10dB steps with 20dB of variable gain
Line: -20dB to +10dB in 10dB steps with 20dB of variable gain
Instrument: 10dB to 40dB continuously variable

Input Impedance
Microphone: (Switched Impedance setting Equivalent Input Impedance at 1kHz)
Low: 600Ω
ISA110: 1.4kΩ
Medium: 2.4kΩ
High: 6.8kΩ
Line: 10kΩ from 10Hz to 200kHz
Instrument:
High: Greater than 1MΩ
Low: Greater than 300kΩ

Frequency Response
Microphone:
Minimum gain (0dB): -0.5dB down at 10Hz and -3.0dB down at 125kHz
Maximum gain (60dB): -3.0dB down at 16Hz and -3.0dB down 118kHz
Line:
At unity gain (0dB): -0.3dB down at 10Hz and -3.0dB down at 200kHz
Instrument:
At 40dB gain with -40dB input: -2.5dB down at 10Hz and 0.0dB at 100kHz

THD + N
Microphone Input: 0.0009% measured with a 1kHz -20dBu input signal and with a 22Hz to 22kHz band-pass filter (at medium gain 30dB)
Line Input: 0.001% measured with a 0dBu input signal and with a 22Hz to 22kHz band-pass filter (at unity gain)
Instrument Input: 0.001% measured with a 10dBu input signal and with a 22Hz to 22kHz band-pass filter (at minimum gain +10dB)

Noise
Microphone: SNR relative to maximum headroom (9dBu): 106dB
EIN: -126dB measured at 60dB of gain with 150Ω terminating impedance and 22Hz to 22kHz band-pass filter
Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz to 22kHz band-pass filter

Line:
SNR relative to maximum headroom (24dBu): 120dB
SNR relative to 0dBFS (+22dBu): 118dB
Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz to 22kHz band-pass filter

Instrument:
Noise at minimum gain (+10dB): -92dBu measured with a 22Hz to 22kHz band-pass filter
Noise at maximum gain (+40dB): -62dBu measured with a 22Hz to 22kHz band-pass filter

Crosstalk
CMRR: 98dB (channel 1, 1kHz, maximum gain with +24dBu input)
Crosstalk Channel to Channel: With 10dB@1kHz input to channel A, channel B output = 104dBrA. With 10dB@10kHz input to channel A, channel B output = 84dBrA

Maximum Output Level
24dBu

Meters
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)

1. 0 = +22dBu
2. -2 = +20dBu
3. -6 = +16dBu
4. -12 = +10dBu
5. -18 = +4dBu
6. -42 = -20dBu

Power Requirements
90~250VAC, 50/60Hz

Dimensions (WxDxH)
8.7 x 10/11.4 x 4.1" (220 x 254/290 x 104 mm)

Weight
8.6 lbs (3.9 kg)

Specialties
18dB per octave 3 pole high-pass filter
Fixed frequency 75Hz measured at the 3.0dB down point

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