There are also two floor clocks downstairs, but with my door closed I don't think I can hear them. There's a fridge downstairs that cycles on and off, but it's at 32dBA/1m, no way you can hear it here. My cat was in my room and I could just about hear her breathing, but my recording system couldn't. LCD PSU noise is below the 10dBA noise floor, but I can still hear it. I kept the CRT off which the LCT 550 seems to be able to pick up and just left on the LCD. My lamp was on, but it seems to be below my mics noise floor. Otherwise a couple wall warts that make a noise, but nothing that bothers me. No other moving parts for basic tasks that don't require much cooling.
Obviously my PC was on to record it, but even when holding my ear right next to the CPU cooler I can't hear the fans spinning at 200RPM. No central AC and definitely not running now. They don't really make a noise while running, but at night the heater is off anyway. Regular old oil furnace in the basement with hot water radiators in every room. I think the main problem is the cardioid mic doesn't pick up as much of the reflected energy, right? Should I try to rest both mics a few centimeters above my bed to absorb as much of the rear radiation from the omni mic as This is at 2:30AM so there really isn't anything that makes a noise outdoors. How would you do it? I know it's not the proper way to do it, which would probably be a 1kHz tone at a fixed distance (if we can't mount the capsule in a calibrator) in an anechoic chamber, but it seemed repeatable enough. Using the dBA curve might be better so the mic FR doesn't play as big a role. Phone lying a couple meters away since one of the mics is a cardioid. I tried to match the dBC levels since that's easier in REW. The mic sensitivity is specified at 1kHz, but going up and down an octave or so shouldn't change much, so in the end I used my phone rather than my speakers at the other end of the room, which results in something like a bandpassed white noise with a 6dB bump betwen 550Hz and 1.3kHz and rolls off sharply beyond 300Hz and 8kHz. The noise floor of the ambient Yep, mics as close as possible. I think what I try to do is to take an average that ignores the peaks.
Would you simply take the average? Look at the peaks? They all seem like valid arguments to me and a single figure can be very misleading. And partly also why I posted these pictures since I'd like to know what you'd say is the ambient level here from the picture.
This is why I mentioned on the first page that we're most likely talking about different things. Not trying to average it, and I'm especially ignoring peaks. What would you use as the figure for the ambient level/noise floor in that case? As mentioned I try to look at the quietest level that is somewhat sustained, so you could argue it's 36-40dBA in that case. You're right, that room was much louder than the other one and I shouldn't have written it like that.