Hi,
I have a Corsair VX450 and it seems to be loud. I found this program (which I realize was suggested deep inside this forum too) called TrueRTA.
Site: http://www.trueaudio.com/rta_abt1.htm
Download: http://www.trueaudio.com/downloads/TrueRTA_se.exe
Anyways, I remember this use to be quiet and wonder if it just got too dusty or was it age. I got an RMA on it, but before sending it wanted to know what others may experienced.
Accordin to http://www.silentpcreview.com/article751-page5.html it should be 22 dBA@1m up to 250W. I will get a Kill-a-Watt to check how much watt it uses later too.
I have a E8400 @ 10% CPU, Antec Solo case and turned off other fans momentarily.
So I was wondering if you have a Corsair VX450, can you run TrueRTA and see what db SPL you get?
Anyone with a Corsair VX450 for over a year, can you measure
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Nope.nstarz wrote:A mic + Room EQ Wizard, good enough?
Calibration Steps: http://www.youtube.com/watch?v=21wUsNfF2Lw
That's a process to calibrate a sound card before looking at room equalization for a HT receiver. It's using a signal played through speakers -- and there's no indication of mic sensitivity. Mics/SLMs are not calibrated this way.
Here's the way mic calibration works:
1) a mic level calibrator is needed. this is a device engineered to produce a tone at 1000hz that is 94 dB at the mic when it is fitted directly over the mic head. it has to fit very tightly; otherwise other sounds can change that 94 dB level. One reason the level is set so high is so that the calibration can be done even in pretty loud conditions (say up to 85 dB). There is usually an alternate level of 104 dB. The most precise mic calibrators are guaranteed accurate at wide atmospheric pressure (altitude) humidity and temp -- and cost $3~4000.
2) The calibration tone produces a certain output level from the mic; this level is = to 94 dB. So the RTA sound software (or sound meter) you are using should read 94 dB. If it does not, then the input sensitivity is adjusted in the program to give 94 dB reading.
3) once the above is done, then the mic is calibrated to give accurate SPL (dB) readings with the software. If you change the mic, the calibration has to be re-done, as the sensitivity (output level for given volume "seen" by a mic) differs from mic to mic.
In our lab, we check the mic calibration around once a week or whenever we suspect something is off. But because the mic and its preamp is left on 24/7 (electronics always warm, mic always charged) and rarely leaves the well-insulated environment of the anechoic chamber, it rarely is out even 0.5 dBA.
0.5 dB or 0.5 dBA?MikeC wrote: In our lab, we check the mic calibration around once a week or whenever we suspect something is off. But because the mic and its preamp is left on 24/7 (electronics always warm, mic always charged) and rarely leaves the well-insulated environment of the anechoic chamber, it rarely is out even 0.5 dBA.
A limit of ± 0.5 dB with respect to 94 dBA SPL would mean the range 0.944 Pa to 1.059 Pa SPL.
0.5 dBA SPL is only slightly larger than 20 µPa and the range concerned is from 0.99998 Pa to 1.00002 Pa SPL.
Therefore if a sound level meter, for example, reads 94.3 dBA upon applying a 94.0 dB SPL reference source, the deviation I think is 0.3 dB rather than 0.3 dBA.