Greetings peoples
I've recently done some reading about ARTA and decided to try it out. Reason being I have a couple of amps I would like to check FR to see if they are flat, but also want to build some stuff in the future witch needs testing.
I have an old laptop (Dell Latitude E6400) witch has output and separate stereo input. Gone through soundcard calibration and done some tests. I followed the manual doing loopback test on soundcard and I see some roll off in upper octave(?) maybe -3dB at 18k if I'm correct. Other than that curve is straight in FR1, and almost flat in impulse converted to FR.
Also did tests on two amps, and both came out flat minus the roll off in the upper region.
Following the manual I did the noise floor test with overlay with and without averaging. Things are starting to get a little hazy now, because I am not very good at this stuff but I want to learn. I struggle a bit with all the lingo and terms sometimes. Manual says to do second measurement with averaging = 100. I can not see where I'm supposed to set this value. I also am not too confident with the values of noise floor test - looks low to me, but then again I'm no expert.
Took some screenshots of measurements, if someone with experience would like to comment, give advice or feedback I would be very thankful 😉
Last thing (for now) is the attenuation of input and levels I am uncertain about. Built a simple voltage divider but I might need more attenuation
I've recently done some reading about ARTA and decided to try it out. Reason being I have a couple of amps I would like to check FR to see if they are flat, but also want to build some stuff in the future witch needs testing.
I have an old laptop (Dell Latitude E6400) witch has output and separate stereo input. Gone through soundcard calibration and done some tests. I followed the manual doing loopback test on soundcard and I see some roll off in upper octave(?) maybe -3dB at 18k if I'm correct. Other than that curve is straight in FR1, and almost flat in impulse converted to FR.
Also did tests on two amps, and both came out flat minus the roll off in the upper region.
Following the manual I did the noise floor test with overlay with and without averaging. Things are starting to get a little hazy now, because I am not very good at this stuff but I want to learn. I struggle a bit with all the lingo and terms sometimes. Manual says to do second measurement with averaging = 100. I can not see where I'm supposed to set this value. I also am not too confident with the values of noise floor test - looks low to me, but then again I'm no expert.
Took some screenshots of measurements, if someone with experience would like to comment, give advice or feedback I would be very thankful 😉
Last thing (for now) is the attenuation of input and levels I am uncertain about. Built a simple voltage divider but I might need more attenuation
