My +91% efficient speakers have a 60dB (not Hz) buzz one inch from the tweeter, mid & woofer dust caps. The noise has been isolated to the Rogue Atlas power amp's PS, but the transformer is quiet. The amp only has about 5k hrs (max), and I only recently used my SPL meter to measure. The amp always had a little noise with my ear to the speaker, but with new hearing aids it's noticeable a couple feet away. Fortunately, the buzz isn't audible where I sit, or with music playing.
I know filter caps are the usual suspects, but might the 50A chassis mount bridge rectifier, or other PCB mounted HV diodes also cause this if the caps are still good? Too bad I didn't check the SPL when the amp was new, as it would have provided a bench-mark. Maybe this noise level is normal for the amp because now, six years after purchase, I can't hear any noise at all, without hearing aids. Besides monitoring the wide-band noise level, any suggestions will be appreciated. Thank you.
I know filter caps are the usual suspects, but might the 50A chassis mount bridge rectifier, or other PCB mounted HV diodes also cause this if the caps are still good? Too bad I didn't check the SPL when the amp was new, as it would have provided a bench-mark. Maybe this noise level is normal for the amp because now, six years after purchase, I can't hear any noise at all, without hearing aids. Besides monitoring the wide-band noise level, any suggestions will be appreciated. Thank you.