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Focusrite ISA ONE Digital - Microphone Preamp with A/D

  • Discontinued

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    This item has been discontinued by the manufacturer and is no longer available.

  • B&H # FOISAONED
  • Mfr# ISA ONE DIGITAL

Product Highlights

  • Single Channel
  • Instrument DI
  • Analog to Digital Converter
  • AES, S/PDIF, ADAT Out
  • Wordclock I/O
  • Transformer Based
  • Insert Point
  • Headphone Output

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The ISA One Digital from Focusrite is a single channel, transformer-based microphone preamp, based on the original ISA 110 preamp that formed the cornerstone of each channel of the legendary Forte console. It features classic vintage topology and includes the Lundahl L1538 transformer and a custom Zobel network.

The included analog-to-digital board provides AES/EBU, S/PDIF and SMUX-compliant ADAT outputs with the preamp and DI signals streamed separately over the 2 channels of the digital connection. The studio-grade A/D conversion with jitter-elimination technology, and the 118dB dynamic range, allows a direct digital bypass of the analog circuitry and converters in the user's DAW audio interface, and provides a high-end signal path straight into any music recording software.

In addition to switchable input impedance settings for the microphone preamp, the unit includes a line input on XLR and 1/4" TRS phone jacks. An independent DI channel features a dedicated gain control, active or passive impedance switch, a 1/4" TRS output for routing to an amplifier, and an independent XLR output on the rear.

The ISA One features an insert point should the need arise to place extra signal processing between the preamp or DI, and the analog-to-digital converter. Phantom power, phase reverse and a 75Hz, 18dB/octave high-pass filter are also available from the angled front fascia.

Independent input metering for both channels is provided by a moving coil VU meter with variable calibration to suit analog and digital recording media, alongside two six-LED peak meters. Inputs can be metered either pre- or post-insert. The meter calibrations utilize the same reference points as Avid's Pro Tools HD systems, allowing effortless integration with Pro Tools.

Classic single-channel Focusrite microphone preamp with independent DI
Encased in a rugged and portable chassis
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
Stereo 192kHz analog-to-digital conversion card utilizes cutting-edge conversion technology and Focusrite analog circuitry to deliver the highest A/D performance with a dynamic range of 119dB
Four, carefully selected, switchable input-impedance levels (including the original ISA 110 setting), to match or enhance the performance of any microphone
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
Dedicated insert point allows the user to place extra processing such as an EQ or compressor, between the preamplifier or DI and the optional converter
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 converter
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

Cables

Pearstone 3-Pin XLR Male to 3-Pin XLR Female Audio Cable (6')
Pearstone -  3-Pin XLR Male to 3-Pin XLR Female Audio Cable (6')
  • Price: $14.95
 
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Digital Cables

Comprehensive EXF Series XLR Male to XLR Female AES/EBU Cable - 3'
Comprehensive -  EXF Series XLR Male to XLR Female AES/EBU Cable - 3'
  • Price: $19.95
 

This is a special order item and is non-cancelable and non-returnable. Est. arrival at B&H is 7-14 days (subject to availability). Your order will be charged at time of shipment.

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Headphones

Sony MDR-V6 Closed Back Stereo Studio Headphones
Sony -  MDR-V6 Closed Back Stereo Studio Headphones
  • Price: $129.95
 
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What's in the Box

Focusrite ISA ONE Digital - Microphone Preamp with A/D
  • AC Power Cable
  • One (1) Year Warranty
 
 
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