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
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.