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Audio-Gd Master 7 - Discrete Fully Balanced DAC (PCM1704) - Page 98

post #1456 of 3612
Quote:
Originally Posted by purrin View Post
 

M7 fed 24/96 via USB using POS built-in soundcard on cheap laptop

 

PWD2 fed 24/96 via USB  using POS built-in soundcard on cheap laptop

 

That's not the same test as mowglycdb's

 

1- Generate a -20dBFS full range (amplitude = 1.0) Pink tone with Audacity.

2- Play it

3- Record with your sound card (on another instance of Audacity - using the same sampling rate for both projects).

4- Plot the spectrum

post #1457 of 3612

Using pink noise is the wrong tool for the job. There's a reason it's called noise.

post #1458 of 3612
Quote:
Originally Posted by purrin View Post
 

Using pink noise is the wrong tool for the job. There's a reason it's called noise.

 

LOL.

 

Regardless, that's what his test was. You can find it stupid if you want, you're not going to prove something is wrong with his M7 by doing a frequency test. It's not comparable.

post #1459 of 3612

It looks to have a lot of saturation because of the high gain I used. I used RCA output from the Master-7 and fed the realtek's line in, atleast those results are consistent with what I'm hearing, that using the Master-7s USB input and  RCA ouput into realtek's line in, is not neutral, but slightly warm. ( I used the pink noise too ).

 

I wonder if that means it's faulty or not lol.

post #1460 of 3612
Quote:
Originally Posted by mowglycdb View Post
 

It looks to have a lot of saturation because of the high gain I used. I used RCA output from the Master-7 and fed the realtek's line in, atleast those results are consistent with what I'm hearing, that using the Master-7s USB input and  RCA ouput into realtek's line in, my is not neutral, but slightly warm. ( I used the pink noise too ).

 

I wonder if that means it's faulty or not lol.

 

It could be what makes the M7 sound warmer (and more natural) than the brighter NFB-1. It could be a defect or component miss-match, who knows?...

 

I find the HE-5LE much more natural in the mids than the HE-6 even though the later is perfectly linear there (a la NFB-1) while the 5LE has a dip in the upper mids (a la M7).

post #1461 of 3612
Quote:
Originally Posted by Fujak View Post

@ mowglycdb: I'm missing information about the kind of signal feeding in. A plot spektrum shows afaik the spectral distribution of frequency in relation to time. What you probably intend to proof would be shown more clearly imho by a so called logsweep.
@ purrin: that looks coherent.

 

 

A logsweep? how can that be done ?

 

Thanks

post #1462 of 3612
Quote:
Originally Posted by mowglycdb View Post
 

 

 

A logsweep? how can that be done ?

 

Thanks

 

Using tools like RMAA. It is fairly easy (not very accurate but it would do this job just fine).

post #1463 of 3612

Thanks, I just saw the program seems to have a lot of options available, I'll try again later today, let's see what's up with my Master-7 :P

post #1464 of 3612
@ mowglycdb: Have look there: http://www.roomeqwizard.com/
post #1465 of 3612

Can't find logsweep in the link you passed, is there another name for this test/measurement?

post #1466 of 3612
Quote:
Originally Posted by Clemmaster View Post
 

 

LOL.

 

Regardless, that's what his test was. You can find it stupid if you want, you're not going to prove something is wrong with his M7 by doing a frequency test. It's not comparable.

 

Pink noise. Linear averaged over about a minute. 96k / 131072 FFT / FlatTop window function. What are we looking for again? 

 

M7

 

PWD2

post #1467 of 3612
They look pretty much the same to me , the Pwd seems a little less linear than the M7. Am I understanding it correctly .

Al
post #1468 of 3612

Close enough. As long as I don't see an -18db hole around 7kHz. The M7's warmer sound cannot be explained by pink noise or tone sweeps.

post #1469 of 3612
Ok. Thanks
Al
post #1470 of 3612
Quote:
Originally Posted by purrin View Post
 

 

Pink noise. Linear averaged over about a minute. 96k / 131072 FFT / FlatTop window function. What are we looking for again? 

 

M7

 

PWD2

 

That's not the spectrum of a pink noise.

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