43 dB noise level from speaker with amps (not including pre-amp)

I measured the noise level about 10 inches from my speakers.

It swings from 40 to 45 dB.

Is this a normal noise floor? The number seemed high to me as when I play 80 dB music, I am assuming the signal to noise is 40 dB (80 minus 40).

Does this sound right? Or is there a mistake in my understanding.

dcaudio04-16-2022 2:01pm

fiesta75 Details Discussions Posts This discussion Message User 1,378 posts 04-17-2022 at 12:32am Copy Comment URL Report Comment Edit Delete What dB meter are you using and has it been calibrated to a known standard? If you’re going to mention a specific dB level it should have been calibrated to NIST
jerryg123 Details Discussions Posts This discussion 3,429 posts 04-17-2022 at 12:59am Copy Comment URL Report Comment Edit Delete Ho do you calibrate an iPhone app....LOL
dcaudio OP Details Discussions Posts This discussion Message User 86 posts 04-17-2022 at 10:38am Copy Comment URL Report Comment Edit Delete Thank you all! 1. I am using a basic dB app.Decibel X.on iPhone Any other suggestions? I realize it is not NIST and not calibrated. Nice toy. 2. App is helpful. I compared impact by moving the tonearm pump to another room. Dropped 7 to 8 dB. Forgot about the logs. Great. Now I see - totally unimportant!! Very helpful. I was worried my tube amps had to high noise when they are turned on. Thank you.