Legend-audio ISA 828 User Manual Page 18
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Specifications
Mic Input Response
• Gain range = 0dB to 60dB in 10dB steps
• Input Impedance, variable as follows:-
Switched Impedance setting Equivalent Input Impedance at 1kHz
Low 600
ISA 110 1400
Med (Medium) 2400
High 6800
• EIN (equivalent input noise) = -126dB measured at 60dB of gain with 150 Ohm terminating impedance and
22Hz/22kHz bandpass filter
• Noise at main output with gain at unity (0dB) = -97dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (9dBu) = 106dB
• THD at medium gain (30dB) = 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency response at minimum gain (0dB) = -0.5dB down at 10Hz and –3dB down at 110kHz
• Frequency response at maximum gain (60dB) = –3dB down at 16Hz and –3dB down 85kHz
• CMRR=91.8dB (Channel 1, 1kHz, maxiumum gain)
• Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA,
chB output = 84dBrA
Line Input Response
• Gain range = -20dB to +10dB in 10dB steps
• Input Impedance = 10kΩ from 10Hz to 200kHz
• Noise at main output with gain at unity (0dB) = -96dBu measured with a 22Hz/22kHz bandpass 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 bandpass filter
• Frequency Response at unity gain (0dB) = 0.3dB down at 10Hz and –3dB down at 122kHz
Instrument Input Response
• Gain range = 10dB to 40dB continuously variable
• Input Impedance:
High >1MΩ
Low > 300kΩ
• Noise at minimum gain (+10dB) = -90dBu measured with a 22Hz/22kHz bandpass filter
• Noise at maximum gain (+40dB) = -62dBu measured with a 22Hz/22kHz bandpass filter
• THD at minimum gain (+10dB) = 0.002% measured with a 10dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at 10dB gain with -10dB input = 10Hz-200kHz +/- 0.6dB
• Frequency Response at 40dB gain with -40dB input = -2.5dB down at 10Hz and 0dB at 200kHz
High Pass Filter
• Roll off = 18dB per octave 3 pole filter
• Fixed Frequency 75Hz measured at the 3dB down point
Input Meter
• Calibrated in the detent position for 0dBFS = +22dBu and indicates the level after the High Pass Filter and before the
Insert Send output. LED levels are as follows:
0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
• Calibration is adjustable to allow 0dBFS to equal +10dBu to +26dBu
18
- User Guide 1
- Mode d’emploi 1
- WARNINGS & CAUTIONS 2
- Contents 3
- Front Panel 5
- Rear Panel 8
- GCHGCHGCH GCHGCHGCHGCHGCH 9
- Digital Options 10
- Applications 12
- Signal Connections 14
- Recording with Inserts 15
- ™ at 192kHz 15
- Specifications 18
- Warranty 19
- Appendix 1 20
- Appendix 2 21
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