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Product Specifiations 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 • Input Impedance: 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 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). 0 = +22dBu -2 = +20dBu -6 = +16dBu -12 = +10dBu -18 = +4dBu -42 = -20dBu FRONT AND REAR CONNECTIVITY 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 Analogue Channel Additional I/O: • Cue mix left input: TRS Jack x 1 • Cue mix right input: TRS Jack x 1 • Headphones output: ¼” TRS Jack x 1

Focusrite ISA-One Professional Studio Mikrofon Preamp

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