Suggestions needed for software, interface etc.

[Winston OBoogie]

I am lucky in that I have a test oscillator than go go up to 40KHz. So far I have used this with a current generation Focusrite 2i2 and also a cheapo Behringer UMC202HD. So far I have not been able to get either of them to convert a 40KHz sine wave at any  sample

For anything beyond around 20KHz I use an oscillator too.  I have a 417C by...  Kikusui?  Japanese manufacture anyway.  It provides a levelled output up to 520KHz. So, for transformer overshoot or looking at loop gain for setting Miller compensation or some such, I use that with a Tektronix 'scope.    I need to get another HP RMS meter instead of using the scope, much easier to deal with,
I love those things, used to have 3 or 4 but they're pricey over here in Blighty.   

P.S.  With my cheapo M-Audio converter I don't get anywhere near being able to convert your 40KHz sine wave test @ 4X sample rate either.  I do wonder if it'd fair better with an interface that lacked superfluous mic amp circuitry in the path. 

 

[abbey road d enfer]

We are building out (at some point in time) a Beis AD/DA convertor.

My understanding is the USB adaptor works only with the ADC, not with the DAC. In fact it's clearly stated. So it can't provide a complete measurement solution.

 

[abbey road d enfer]

Just bought a Native Instruments Komplete Audio 2 USB interface. Works like a charm at 192k; -3dB point is 62kHz. I could live with it.

 

[ruffrecords]

Just bought a Native Instruments Komplete Audio 2 USB interface. Works like a charm at 192k; -3dB point is 62kHz. I could live with it.

Is it this one:

https://www.bax-shop.co.uk/external-audio-interface/native-instruments-komplete-audio-2-2-channel-audio-interface?utm_source=bing&utm_medium=cpc&utm_campaign=UK%20-%20Bing%20-%20Studio%20%26%20Recording%20-%20Longtail&utm_term=native%20instruments%20komplete%20audio%202&utm_content=20485-32AFAA78-F10F-4207-AD1E-405C6A051218S76141307574191&msclkid=52c3f15394871baee18eaf0d03e21a58

because it is a bargain at less than £100.

Cheers

Ian

 

[abbey road d enfer]

Is it this one:

https://www.bax-shop.co.uk/external-audio-interface/native-instruments-komplete-audio-2-2-channel-audio-interface?utm_source=bing&utm_medium=cpc&utm_campaign=UK%20-%20Bing%20-%20Studio%20%26%20Recording%20-%20Longtail&utm_term=native%20instruments%20komplete%20audio%202&utm_content=20485-32AFAA78-F10F-4207-AD1E-405C6A051218S76141307574191&msclkid=52c3f15394871baee18eaf0d03e21a58

because it is a bargain at less than £100.

Cheers

Ian

That's right.
However I must say it doesn't work so good with audiotester and RMAA.

 

[ruffrecords]

That's right.
However I must say it doesn't work so good with audiotester and RMAA.

So what were you using when you measured the 62KHz bandwidth?

 

[abbey road d enfer]

So what were you using when you measured the 62KHz bandwidth?

REW. The 62k BW is actually almost exclusively in the A/D. The D/A is flat up to about 90kHz, where it starts to show some ripple (maybe some kind of beating with the clock).

 

[ruffrecords]

REW. The 62k BW is actually almost exclusively in the A/D. The D/A is flat up to about 90kHz, where it starts to show some ripple (maybe some kind of beating with the clock).

That is very good news because that is exactly what I use. I am placing my order now.

Did you use the specific ASIO drivers?

Cheers

Ian

 

[abbey road d enfer]

Did you use the specific ASIO drivers?

Yes. It doesn't work with the generic Windows driver.

 

[john12ax7]

How is the distortion on it?

 

[abbey road d enfer]

How is the distortion on it?

THD is -91dB over most of the audio band. That includes D/A, my interface (THAT 1240, OPA2134, THAT 1646, OPA2134, THAT1240, OPA2134) and A/D.

 

[ruffrecords]

The other thing I like about it is the line input will take levels up to +20dBu.

Cheers

Ian

 

[abbey road d enfer]

The other thing I like about it is the line input will take levels up to +20dBu.

Cheers

Ian

This I haven't verified. It's not very important for me since I have a 0/-20/-40 dB switchable attenuator in my interface box.
However, what I couldn't verify is the output level, which is supposed to be +12dBu.
Using REW, that allows a max output level of -3dBfs, I get an output of a little less than +7dBu, so at 100% fs, the output would be a tad under +10.
I'll need to increase the gain in my interface box to reach +20 dBu.

 

[abbey road d enfer]

The other thing I like about it is the line input will take levels up to +20dBu.

Using REW, with the gain set at minimum, 0dBfs happens with +13dBu at the line input. The input stage can probably handle +20 but the converter will be long overflown by then.

 

[ruffrecords]

Using REW, with the gain set at minimum, 0dBfs happens with +13dBu at the line input. The input stage can probably handle +20 but the converter will be long overflown by then.

Looks like I will still need my combined 600 ohms load & 20dB pad.

Cheers

ian

 

[abbey road d enfer]

Looks like I will still need my combined 600 ohms load & 20dB pad.

Cheers

ian

I'm convinced no soundcard-based solution can spare the need for additional hardware.

 

[abbey road d enfer]

pic

 

[Newmarket]

That's right.
However I must say it doesn't work so good with audiotester and RMAA.

Hi. It's a good few years since I used any audio test kit seriously - AP Sys 2 / Prism / Neutrik A2 - so please bear with my ignorance
But what do you mean by not working so good with certain software products ? Is it a driver thing ?

Cheers.

 

[abbey road d enfer]

But what do you mean by not working so good with certain software products ? Is it a driver thing ?

RMAA is not capable of using the ASIO driver, so measurements at 192k are not possible.
Audiotester works with the ASIO driver and gives good results, after a lot of tweaking, that it looses when quitting. 

 

[Newmarket]

RMAA is not capable of using the ASIO driver, so measurements at 192k are not possible.

Ahh...I see...

Audiotester works with the ASIO driver and gives good results, after a lot of tweaking, that it looses when quitting. 

Oh...that's annoying !