#Truerta zippyshare generator
Even if you had a highly accurate sign wave generator making an electronic measure with a very quiet noise floor - it is a fundamental to windowed DSP that you cannot measure a pure sign wave - to do so would require an infinite measure. If they all play their frequency together - don't you think it would be louder than if only one frequency was played? Look more closely at the spectrum of a sine wave - it still contains energy at other frequencies! One would have to compute the RTA SPL values from the underlying FFT data to figure out if those increasing numbers are correct or not - but I would expect them to increase as you included more frequencies by increasing the bandwidth of the measure. Imagine that you have an orchestra of tuning forks each playing only one frequency. This is simply because a larger fraction has more frequencies in it. I am not commenting on TrueRTA bugs - been a while since I used it - but I thought it was one of the better RTA's with a goal of measurement and generation precision.īut I think you have a fundamental misunderstanding about acoustic measures.Īre you expecting SPL measures to be spectral density - in which case the frequency resolution does not matter and you would get the same results?Ī partial octave measure is something different, it is indeed a lesser SPL if you measure a finer octave fraction of the same source. If so, it's not working any better than my above scenario in the sense that I can't get a smooth calibration with this setup either. In my mind that seems like the starting point that I would want to calibrate, since all of my sources are digital? So, I have been trying to use trueRTA to calibrate by driving digital into the preamp, and connecting the line-in of my soundcard (any of the 3 I have) to the left channel output of the preamp.
![truerta zippyshare truerta zippyshare](https://i.ytimg.com/vi/Pkp-bmVnBw4/maxresdefault.jpg)
From my laptop I can drive a digital coax connection to my preamp. So I've been experimenting with a few things to see what I can do. So, in this case, I'm not sure that doing a calibration makes any sense at all? Since I don't care what the analog out side of my soundcard is doing, testing and calibrating a loop doesn't make a lot of sense? I'm using the DACs in the Cary 11a unit that I have to produce all output to my amp.
![truerta zippyshare truerta zippyshare](https://i.ytimg.com/vi/LcvMhN7nTJs/maxresdefault.jpg)
I have another question along these lines also.
![truerta zippyshare truerta zippyshare](https://i.ytimg.com/vi/JJMvAKMfJrU/maxresdefault.jpg)
#Truerta zippyshare windows
I'm running Windows XP on my laptop (older Dell unit). And when I take measurements, whether using the calibration or not, I have huge spikes and peaks (which of course is possible from the room, but moving the mic doesn't help much), so I'm not trusting the results I see. With the MobilePre, I'm not getting a flat calibration. Using either the built-in soundcard or a cheap USB unit that I purchased, I can get flat calibrations.