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Here is an image of the signal generator, set white noise
In Internet slang, a troll is a person who starts flame wars or intentionally upsets people on the Internet by posting inflammatory and digressive,[1] extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the intent of provoking readers into displaying emotional responses[2] and normalizing tangential discussion,[3] either for the troll's amusement, or to achieve a specific result such as disrupting a rival's online activities or manipulating a political process.No, you have tried to sell it. There's a difference.
AC voltage on the Fluke 179 is specified only up to 1 kHz. It is not a suitable instrument for this measurement.I have measured the voltages in these two images. Input 55.5 mV and set the y axis to volts. Driven from the monitor speaker output of the 2i2 set to maximum.View attachment 95762
So on the 'flat strip apart' cable we measure 1.1mV @ 10kHz over the cable with a 55.5mV input voltage. That would be a cable loss of 0,17dB @ 10kHz, using a cable specifically crafted to increase cable losses? Do I have the numbers right?I have measured the voltages in these two images. Input 55.5 mV and set the y axis to volts. Driven from the monitor speaker output of the 2i2 set to maximum.View attachment 95762
I have measured the voltages in these two images. Input 55.5 mV and set the y axis to volts. Driven from the monitor speaker output of the 2i2 set to maximum.View attachment 95762View attachment 95763View attachment 95763
Now do “scammer.”In Internet slang, a troll is a person who starts flame wars or intentionally upsets people on the Internet by posting inflammatory and digressive,[1] extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the intent of provoking readers into displaying emotional responses[2] and normalizing tangential discussion,[3] either for the troll's amusement, or to achieve a specific result such as disrupting a rival's online activities or manipulating a political process.
The conditions are as described in the paper.We cannot conclude anything from the posted plots. Why 2 of the same plots ?
A: We don't know if the dummy load or a resistor was used as a load.
B: mr. Townshend should have made a reference measurement where the input of the ADC should be connected to the output of the amp so we get a real reference in the form of the sweep. The 55.5mV says nothing, we don't know how sensitive the ADC was set, we don't know if the voltage level is referenced.
C: mr Townshend conveniently forgot to mention the cable length as well. (this could have given a clue about calibration)
D: About the dummy load: The posted schematic won't have the impedance posted alongside. Amir's sim is better. Why is the plot from mr Townshend incorrect or the schematic is incorrect (has a Boucherot filter installed ?)
We cannot conclude anything from the posted plots. Why 2 of the same plots ?
A: We don't know if the dummy load or a resistor was used as a load.
B: mr. Townshend should have made a reference measurement where the input of the ADC should be connected to the output of the amp so we get a real reference in the form of the sweep. The 55.5mV says nothing, we don't know how sensitive the ADC was set, we don't know if the voltage level is referenced.
C: mr Townshend conveniently forgot to mention the cable length as well. (this could have given a clue about calibration)
D: About the dummy load: The posted schematic won't have the impedance posted alongside. Amir's sim is better. Why is the plot from mr Townshend incorrect or the schematic is incorrect (has a Boucherot filter installed ?)
E: Why not a comparo between regular speaker cable and the Isolda instead of the single strip of isolda cable which measures FAR worse that any speaker cable.
Where do you see "70uV at 20Hz"? And how is 70uV cable loss 23dB of a 55mV input voltage?55mv between red and black into dummy load. Black to black, 70uV at 20Hz, 1000uV at 10k = 23dB. This is similar as shown in fig 3.
AC voltage on the Fluke 179 is specified only up to 1 kHz. It is not a suitable instrument for this measurement.
The 55.5 mV is almost certainly wildly off due to limitations of the Fluke 179 meter.The 55.5mV says nothing
The conditions are as described in the paper.
I measured the voltage into the cables with the Fluke 179. It may be +/- 10%
If you want all those answers, do the experiment yourself and get your own answers.
Where do you see "70uV at 20Hz"? And how is 70uV cable loss 23dB of a 55mV input voltage?
View attachment 95785
Didn't notice he mentioned 20Hz and not 20kHz. I corrected my post. Still interested to know how he ends up with a 23dB cable loss, because that huge.The plot shows 70uV at 20Hz.
Still interested to know how he ends up with a 23dB cable loss, because that huge.
We don't need the reference as we now have a graph showing voltages. Input voltage 55.5mV, and 1.1mV cable loss @ 10kHz. What's the formula that gives 23dB cable loss using these input parameters?Without a real reference we have to trust him... Given the track record of being vague and incomplete ...
23 dB is the ratio of 70 mV to 1 V, the approximate graph values at 20 Hz and 10 kHz.We don't need the reference as we now have a graph showing voltages. Input voltage 55.5mV, and 1.1mV cable loss @ 10kHz. What's the formula that gives 23dB cable loss using these input parameters?
(There might be some error margin on the 55.5mV input voltage, but that error would need to be really huge to get a 23dB cable loss).