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Zip cord for speaker test
Zip cord for speaker test
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Old 10th June 2021, 05:37 PM   #241
Hans Polak is offline Hans Polak  Netherlands
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Quote:
Originally Posted by danny_66 View Post
Here are some on banggood for about 50Ä
Well thatís an amazing value for money.
But starting at 50Khz misses the important audio range from 100Hz to 50Khz.

Hans
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Old 10th June 2021, 06:26 PM   #242
peufeu is offline peufeu  France
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Quote:
Originally Posted by Hans Polak View Post
But starting at 50Khz misses the important audio range from 100Hz to 50Khz.
This is possible, but it costs extra. For example this analyzer uses some RF transformers, and these have limited bandwidth. There are probably other components that limit bandwidth. I spotted a few RF switches that are cheap because they're used for ubiquitous cellphone/wireless frequencies, but a quick datasheet check shows they stop at 100kHz on the way down. Also the mixer has a low frequency limit, etc.

So yeah if you add $$ for a few high quality RF switches, and more $$ for separate signal paths designed for each range of frequency, you can get a wider range... but that's not the point of this project...

A soundcard makes a nice LF network analyzer btw. I have a N2PK network analyzer, and I just stitch the graphs from it and the soundcard with some python scripts.

Last edited by peufeu; 10th June 2021 at 06:31 PM.
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Old 10th June 2021, 08:41 PM   #243
Hans Polak is offline Hans Polak  Netherlands
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Quote:
Originally Posted by danny_66 View Post
Here are some on banggood for about 50Ä
Maybe itís a better idea to just measure the inductance and DC resistance with shorted cable and eventually the capacity with open ended cable.
That will do.

Hans
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Old 10th June 2021, 09:45 PM   #244
danny_66 is offline danny_66  Belgium
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Thanks Hans,
My LCR meter that I use for measuring coils in the mH range,
has also a uH range setting, that will do
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My RefSpeaker v2
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Old 11th June 2021, 07:32 AM   #245
planet IX is offline planet IX  Germany
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Hans, I’ve measured this parameters on my speaker cable:
L= 4,54ĶH C=250pF R=0,23Ohm so SQRT(L/C) gives Z= 133Ohm (~4m in length)
My speakers are 6Ohm, so this is my target impedance, right?
So I need ~120nF to add to the cable, evenly spread over the length?

Thanks, Boris
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Old 11th June 2021, 08:47 AM   #246
Hans Polak is offline Hans Polak  Netherlands
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Hi Boris,

To be sure that we use the right figures:
The 0,23R you measured is for 4meter shorted at the end, so for 8 meter cable in total gives 29mR/meter.
That would mean that you are using a 0,7mm^2 zip cord, right ?
That's quite small for this exercise, but I will make the sim for you this afternoon and show you the result with this cable and with a thicker one.

Hans
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Old 11th June 2021, 09:18 AM   #247
planet IX is offline planet IX  Germany
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Thanks, Hans. Yes the resistance is for 8m cable (4m/shorted at one end).
I have given up cable experiments in the past and I use this cable only because I was too lazy to look up for something better. But I find your results highly interesting and it encourages me to start experimenting again...

Boris
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Old 11th June 2021, 01:27 PM   #248
Hans Polak is offline Hans Polak  Netherlands
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Boris,

You mentioned to have 6R speakers, that's why I have optimised the cable for 6R.
I have simulated Zo for your 0.6mm^2 cable and for a 4mm^2.
Quite obvious is the big difference at LF.
I have assumed to divide the cable in 4 equal parts, and to connect at the 3 points in between resp 42nF, 0.45uH and 9R, all components three in series.
The 9R should be a very low inductance 30Watt (current sense) resistor and the 0.45uH should be a version for several amps.

Hans
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Last edited by Hans Polak; 11th June 2021 at 01:35 PM.
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Old 11th June 2021, 04:38 PM   #249
planet IX is offline planet IX  Germany
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Thanks a lot, Hans. I think I will try out the 4mm2 version.
Looking forward to the results...
Regards, Boris
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Old 12th June 2021, 11:27 AM   #250
Hans Polak is offline Hans Polak  Netherlands
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Amazon has very affordable 4mm^2.
But anyhow, when you have the cable, let me again know the inductance and I will do a recalculation.

Hans
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