gml gml2020 Manual De Usuario
Specification Notes
* All tests conducted at the GML laboratory using the Audio Precision System Two Cascade Dual Domain (AP S2C), or otherwise as noted.
Unless specified differently, all tests include AP S2C residual measurement and were conducted under the following conditions: Rs=40
Unless specified differently, all tests include AP S2C residual measurement and were conducted under the following conditions: Rs=40
Ω
,
RL=100k
Ω
, <10Hz to >500kHz analyzer bandwidth. GML reserves the right to make changes to these specifications as it deems necessary.
Individual unit performance may vary due to environmental influences, manufacturing variations, and component tolerances.
1
CMRR determined by calculating the average across a 200-point logarithmic frequency sweep from 20 Hz to 20 kHz.
DUT set to 70 dB gain, +20 dBu CMTST signal from AP S2C.
2
Clipping as determined by THD+N in excess of 0.1% for Mic and Line inputs, 1.0% for M/I input. The stated value for
the Mic and Line input was calculated by adding 10 dBu to the measured clipping point at the 0dB gain setting of the
DUT, to accommodate direct inspection (the AP S2C Generator output cannot exceed +30 dBu). M/I clipping, as stated, is
independent of gain setting since the M/I input buffer clips before the gain stage(s).
DUT, to accommodate direct inspection (the AP S2C Generator output cannot exceed +30 dBu). M/I clipping, as stated, is
independent of gain setting since the M/I input buffer clips before the gain stage(s).
3
All bandwidth tests conducted at +0.0 dBu output level. Measurements are typical across the gain range of the DUT.
Default input gain settings: +45dB, Mic; 0dB, Line and M/I.
4
Direct -3 dB measurement using HP 3314A function generator (Rs=50
Ω
) and Tektronix 2445 150MHz analog
oscilloscope (Rin=1M
Ω
, 15pF), at 0dBu unbalanced. The low-frequency -3 dB corner of the Model 2020 exceeds the LF
response of the HP 3314A, which has a -3 dB corner at 7 Hz.
5
Includes AP S2C residual THD+N of 0.0007% and Analyzer 30 kHz LPF. Test conducted with -25 dBu swept sine, Mic
input, 45dB gain setting.
6
Includes AP System One residual IMD of 0.001%. Test conducted with -35 dBu SMPTE/DIN 4:1 signal, 7 kHz and 60
Hz. DUT set for 45dB gain, Mic input.
7
Noise measurement with Rs=150
Ω
balanced termination. Specification includes 2
nd
order LPF at 30 kHz. Theoretical
source resistance noise for this bandwidth is -128.7 dBu. Mic input, 70dB gain setting.
8
Direct -3 dB measurement using HP 3314A function generator (Rs=50
Ω
) and Tektronix 2445 150MHz analog
oscilloscope (Rin=1M
Ω
, 15pF), at 0dBu unbalanced. The low-frequency -3 dB corner of the Model 2020 exceeds the LF
response of the HP 3314A, which has a -3 dB corner at 7 Hz.
9
Includes AP S2C residual THD+N of 0.0007% and Analyzer 30 kHz LPF. Test conducted with +20 dBu swept sine,
Line input, 0dB gain setting.
10
Includes AP System One residual IMD of 0.001%. Test conducted with +10 dBu SMPTE/DIN 4:1 signal, 7 kHz and 60
Hz. DUT set for 0dB gain, Line input.
11
Noise measurement with Rs=150
Ω
balanced termination. Specification includes 2
nd
order LPF at 30 kHz. Theoretical
source resistance noise for this bandwidth is -128.7 dBu. Line input, 70dB gain setting.
12
Includes AP S2C residual THD+N of 0.0007% and Analyzer 30 kHz LPF. Test conducted with +0 dBu swept sine, M/I
input, 0dB gain setting.
13
Includes AP System One residual IMD of 0.001%. Test conducted with +10 dBu SMPTE/DIN 4:1 signal, 7 kHz and 60
Hz. DUT set for 0dB gain, M/I input.
14
Noise measurement with Rs=150
Ω
unbalanced termination. Specification includes 2
nd
order LPF at 30 kHz.
Theoretical source resistance noise for this bandwidth is -128.7 dBu. M/I input, 70dB gain setting.
15
Includes AP S2C residual crosstalk of -140 dB. Test conducted with +30 dBu 1.0 kHz balanced to noted input, DUT set
for 20dB gain, measured input source selected; except M/I signal measurements, which used +20 dBu 1.0 kHz unbalanced
signal.
signal.
16
All EQ Section measurements utilize Line input, 0 dB gain, EQ In, no cut/boost, minimum frequency and Q settings.
17
Includes AP S2C Analyzer 30 kHz LPF. <-83 dBu versus -96 dBu noise, Line input, Rs=150
Ω
, 0 dB gain. It is
important to note that hardware limitations of the AP S2C--including low-level reading resolution and residual noise--
prevent a more accurate absolute-noise measurement for the low-gain settings of the Model 2020.
prevent a more accurate absolute-noise measurement for the low-gain settings of the Model 2020.
18
THD+N averaged from 20 Hz to 20 kHz, including 30 kHz LPF. Line input, 0 dB gain, EQ In, no cut/boost, minimum
frequency and Q settings, +20 dBu input.
19
Includes AP System One residual IMD of 0.001%. Test conducted with +10 dBu SMPTE/DIN 4:1 signal, 7 kHz and 60
Hz. DUT set for 0dB gain, Line input, EQ In, no cut/boost, minimum frequency and Q settings.
20
All Dynamics Section measurements utilize Line input, 0 dB gain, DYN In, 0 dB Threshold control, 0 dB Output
control, no net gain change.
21
Includes AP S2C Analyzer 30 kHz LPF. <-86 dBu versus -96 dBu noise, Line input, Rs=150
Ω
, 0 dB gain. It is
important to note that hardware limitations of the AP S2C--including low-level reading resolution and residual noise--
prevent a more accurate absolute-noise measurement for the low-gain settings of the Model 2020.
prevent a more accurate absolute-noise measurement for the low-gain settings of the Model 2020.
22
THD+N averaged from 20 Hz to 20 kHz, including 30 kHz LPF, +10 dBu. Line input, 0 dB gain, DYN In, 0 dB
Threshold control, 0 dB Output control, no net gain change, Sidechain engaged.
23
Includes AP System One residual IMD of 0.001%. Test conducted with +10 dBu SMPTE/DIN 4:1 signal, 7 kHz and 60
Hz. DUT set for 0dB gain, Line input, DYN In, 0 dB Threshold control, 0 dB Output control, no net gain change,
Sidechain engaged.
Sidechain engaged.