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Beta Test: Multitone Loopback Analyzer software

There must be something off by 1dB in freq chart:

Emu SINAD.PNG


That's the normal I get (x-crossed with REW as well)

THDN.PNG


..and that's what I get with this version.

(I hope it's not me :confused: )
 
Sokel said:
There must be something off by 1dB in freq chart:

View attachment 435701

That's the normal I get (x-crossed with REW as well)

View attachment 435702

..and that's what I get with this version.

(I hope it's not me :confused: )
Click to expand...

I noticed the same thing weeks ago.

You can verify the real difference between the versions by first measuring one round with version 1.2.9 and dragging the recording of it (e.g. C:\ProgramData\Multitone Analyzer\history\results123456789_b.wav) into the spectrum view of version 1.1.12 and let it calculate its own version of it. This way you can get rid of the run-to-run variance of the analog signal.

Usually the difference is about 0.5 - 1.0 dB and version 1.1.12 always shows a better result.
 
Rantapossu said:
I noticed the same thing weeks ago.

You can verify the real difference between the versions by first measuring one round with version 1.2.9 and dragging the recording of it (e.g. C:\ProgramData\Multitone Analyzer\history\results123456789_b.wav) into the spectrum view of version 1.1.12 and let it calculate its own version of it. This way you can get rid of the run-to-run variance of the analog signal.

Usually the difference is about 0.5 - 1.0 dB and version 1.1.12 always shows a better result.
Click to expand...

Can you share such a recording/measurement with me?

I get a difference of 0.1-0.2dB when I measure the same file with REW and Multitone 1.2.9 for THD and TD+N values.
 
pkane said:
Can you share such a recording/measurement with me?

I get a difference of 0.1-0.2dB when I measure the same file with REW and Multitone 1.2.9 for THD and TD+N values.
Click to expand...

Sure!

This is the difference between the two versions of MultiTone. I will share a difference betweeen Multitone and REW later...

V1.2.9 (straight from the audio interface) :

1741883650693.png




The same recorded wav-file dragged to the spectrum view of version 1.1.12 and it has 0.7 dB difference:

1741883730786.png



For comparison's sake the same wav-file dragged back to the spectrum view of V1.2. 9 and it is still -119.4 dB:

1741883987326.png



Here is the measurement:

limewire.com

Download Measurement.mth | LimeWire

Download Measurement.mth on LimeWire
limewire.com limewire.com
 
There is no difference with TD+N when the previous wav-file is dragged to the RTA-window of REW (When there is no calibration file or APU used):

1741900845291.png



REW:
1741900909140.png



Multitone 1.2.9:
1741901040142.png
 
Things change when Cosmos LPF, Cosmos APU and calibration file are implemented:

Multitone V1.2.9 (-129.2 dB):

1741901347129.png



Multitone V1.1.12 (-129.9 dB, it is 0.7 dB better vs. Multitone V1.2.9):

1741901455109.png



REW (-130.7 dB, it is 1.5 dB better vs. Multitone V1.2.9):

1741901688205.png


1741901781426.png


Here is the measurement and the calibration file:

limewire.com

Content not found | LimeWire

Content not found on LimeWire
limewire.com limewire.com
 
That's REW and MTA right now:

rew.PNG


MT.PNG


REW is buggy about noise and SNR on the other hand at the last few beta,for some reason they are always the same no matter what.
 
Sokel said:
REW is buggy about noise on the other hand at the last few beta.
Click to expand...

The bug only applies to dBc-measurements. If you change the unit to dBFS and drag the wav-file again to the RTA or measure again normally, it will calculate it correctly.

When using dBc it only adds the minus sign before the SNR-measurement.
 
Last edited:
Try with for example the -60 dBFS signal and compare dBc and dBFS units regarding the noise...
 
Last edited:
BKDad said:
Could you tell me what the jack arrangements are for the audio connections? That is, when you're looking from the front, is it J1 to J4 from left to right?
Click to expand...

J1 is the left one and J4 is the right one.

Just like in this picture:

1742243877997.png
 
If you can keep your APU cold (To prevent H3 from rising) , you could expect TD+N -129.8 to -129.9 dB with Multitone and -131.2 to -131.4 dB with REW when using LPF and E50 (Both channels driven).

This is mine with a slightly warm APU:

1742244938905.png
 
Rantapossu said:
If you can keep your APU cold (To prevent H3 from rising) , you could expect TD+N -129.8 to -129.9 dB with Multitone and -131.2 to -131.4 dB with REW when using LPF and E50 (Both channels driven).

This is mine with a slightly warm APU:

View attachment 437022
Click to expand...
can use peltier module?
 
Hey! The trick would be to use a Peltier element to cool the APU with the ADC used as the heat sink. The heat would transfer from the APU to the ADC. (Mechanically that would be a challenge.)

We might be getting a bit obsessive. Here, I thought I was being crazy for designing and having machined a new front panel for the LPF.
 
BKDad said:
Hey! The trick would be to use a Peltier element to cool the APU with the ADC used as the heat sink. The heat would transfer from the APU to the ADC. (Mechanically that would be a challenge.)

We might be getting a bit obsessive. Here, I thought I was being crazy for designing and having machined a new front panel for the LPF.
Click to expand...

Are you planning a common case for all Cosmos products or just for the LPF?

If the APU front plate I ordered for the LPF had had the original texts, I would have made a new front plate for LPF too. Luckily it was completely black without any markings.

I have a 3 kW nitrogen laser at work, so it would have cut the new front plate out of steel in less than ten seconds... :cool:
 
It's a replacement for the APU case front panel. Very similar, but the font for the LPF version is slightly different than what is used on the Cosmos components. Life is full of compromises.

I've thought of combining all the Cosmos modules into a single box, and perhaps adding a couple others, but then I finally decided that I'd rather just use the test gear as tools and spend the time working on the preamp and amplifier. I'm fine with this all being hobbyist oriented, because that is what I am in the end.

No lasers here except for the pointer/level I use on occasion to make sure the loudspeakers are oriented and tilted properly. :)
 
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