Funny thing,I am now running Visual analyzer,and at 0,05v the dist on F6 (in to the souncard) is about 0,5% at 0,2v its 0,13% and at 0,3v it is 0,013%..
Yes it have to be sufficient at the moment because i cannot afford it.
very irritating, ave no answer at the moment...
0,013 is a possible value.....
please try also ARTA.....if you still have Lust.....
0,013 is a possible value.....
please try also ARTA.....if you still have Lust.....
Can you post a pic. Visual analyzer allows this. Try the link. First priority is setting up sound card and seeing its capabilities. You learn as much setting it up as you do testing.
only a crazy idea, the distortion differences at o,2V and 0,3V caused by the pot?
only two resistors alone with 0,2V have the same behavior
but mostly crazy idea......
only two resistors alone with 0,2V have the same behavior
but mostly crazy idea......
If this is loop back, then you will hav a tough time. Have you played with input and output volume?
So many harmonics besides k2 and k3 might be from the soundcard.
The F6 has mostly k2 and k3 and very low higher harmonics...
Is this picture from the amp or the soundcard in self test....?
The F6 has mostly k2 and k3 and very low higher harmonics...
Is this picture from the amp or the soundcard in self test....?
It is actually from the F6,all the levels are right.
Doing a loop on the souncard right now looking the same..the level on the voltmeter is 0.3v.
Doing a loop on the souncard right now looking the same..the level on the voltmeter is 0.3v.
Loop the soundcard. And put the input level on 1 and output level on 100(Windows, Mac may be different.). I am talking system volume. SLowly lower the volume level and see what happens while watching the oscilloscope and runnig a sinewave. You can watch THd at same time. See whats happening. After trying this, lower output and rasie input, doing same thing. Your computer may have a sweet spot
The least distortion I got when Input was on 100% and output a little above 50,but that won´t be enough to run the amp to 2,83v only 2.0v...
I´m gonna "have" to use this setup only to set the k2 distortion messaurements,and buy a new sound card later on.
I´m gonna "have" to use this setup only to set the k2 distortion messaurements,and buy a new sound card later on.
You need to measure 2.83V across the 8R load resistor placed across the speaker terminals. THat is 1W of output from the amp. You do not need 2.83 out of the sound card. I am thinking you will need about .5V
Can't you change the output of the soundcard in your distortion program?
Of course you have lower distortion with 2V over the 8R but you should go to 2,83V.
I suppose you will come to 0.02 %, still a very good value.
My misunderstanding. I thought you were only getting 2V output in loopback, with no amp connected.
Gonna connect the amp to the "stero" and listen for a couple of days.🙂
Is the Spdif out any good quality on that EMU 0404 USB?
Is the Spdif out any good quality on that EMU 0404 USB?
That's more a question for Buzz, I owe only an EMU 0204 and I killed one input channel with distortion measurements so it is only a 0104....🙂
And I never used digital connections.
And I never used digital connections.
I did not have the usb 0404, but the pc version of the EMu 1212. They make good soundcards, so it will be very good. Is it HiFi? I think its best not to go there. Its a long, expensive path that usually involves spending lots of money on the last 15% of performance, only to realize that evrything is a tradeoff and you will need 4 amps, 3 dacs, 6 speakers, 5 preamps and 24 sets of cables to get it right.😀
Me, I like to corral all the distortion producing mechanisms into one place
where I can put a lasso on them - the output stage of the power amp.
where I can put a lasso on them - the output stage of the power amp.
