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Focusrite ISA One Single-Channel Microphone Preamplifier with DI, VU Meters and Flight Case

 
  • Dale #:

    FOPR-ISAONE
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Description

Classic Single-channel Microphone Pre-amplifier with Independent D.I. The "…ISA One' microphone pre-amplifier delivers Focusrite's prestigious ISA transformer-based pre-amp in a rugged and portable chassis, at a groundbreaking price. ISA One features the classic vintage microphone pre-amplifier t... Read More

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Description

Classic Single-channel Microphone Pre-amplifier with Independent D.I.

The "…ISA One' microphone pre-amplifier delivers Focusrite's prestigious ISA transformer-based pre-amp in a rugged and portable chassis, at a groundbreaking price. ISA One features the classic vintage microphone pre-amplifier topology from the original ISA110 module, including the Lundahl L1538 transformer and bespoke zobel network. (The original 110 pre amp formed the cornerstone of each channel of Focusrite's legendary Forte console.)The pre-amp is complemented by a line input (XLR and TRS Jack) and an independent D.I. channel, complete with dedicated gain control, active or passive impedance switch, a TRS Jack output for routing to an amp and an independent XLR output on the rear. This flexible independent D.I. makes the ISA One ideal both for engineers wishing to blend a D.I.'d guitar signal with a mic'd guitar cabinet, and for demanding performers who require a single classic solution for both guitar and vocals.Features:
  • ISA Series Transformer-based Pre-amplifier : Encased in a rugged and portable chassis, ISA One offers the classic Focusrite microphone pre-amplifier at its lowest cost to date.
  • Flexible Independent D.I. 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 ADC.
  • Switchable Impedance : Choose one of four carefully selected input impedances, including the original ISA 110 setting, to suit any microphone.
  • Optional Stereo 192kHz ADC : This optional card embodies cutting-edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance in its class (Dynamic range of 119dB).
  • Rugged Custom Flight Case : Built to protect your ISA One from the rigors of the road. Rugged plywood construction with a solid polypropylene exterior and reinforced corners.
  • Headphone Output with Volume Control : ISA One 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 you to place extra processing between the pre-amplifi er or D.I. and the optional converter, such as an EQ or compressor.

An optional state-of-the-art stereo A-D converter is also available (the same card as used with the ISA430 Mk II), embodying cutting-edge conversion technology seated within Focusrite's custom analogue circuitry. This optional card can be retrofitted at any time and provides two channels of 24 bit/192kHz A-D conversion with a dynamic range of 119dB.

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Product Specs

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 10kohms 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
Input Impedance High : greater than1Mohms; Low : greater than 300kohms
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 Frequency Response at 40dB gain with -40dB input
Analogue 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
Analogue Channel Outputs Send: TRS Jack x 1; Balanced line output: XLR x 1; DI output: XLR x 1; DI through: TS Jack x 1
Weight 3.9kg ( 8.6lbs )
Dimensions 220mm (W) x 104mm (H) x 254 - 290mm (D - top to bottom) (8.66 (W) x 4.1 (H) x 10 - 11.4 (D - top to bottom) )

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