A few Sony HDR-PJ810E owners who reviewed it concluded that it was quiet. Dr. Paul Ell said two years ago “It's always an option to keep quiet”. Jimbojim2179 said “Sound proof the mic please so you don't hear it on all of yur recordings in the background please or use a silent fan or better cooling” however despite that they rated it 60 out of 100.
Two Sony HDR-PJ810E owners mentioned in their reviews that it was noisy. Dr. Paul Ell said in his review of this camcorder on Amazon “To be honest the sound is a bit of a letdown here - it simply cannot be set at a sufficiently loud level using the camera speaker”. Jimbojim2179 mentioned in their Sony HDR-PJ810E review on Amazon two years ago “The vid quality is better, doesn't have the annoying background fan noise, much larger sensor so is much better vid quality indoors” however despite that they rated the product 60 out of 100.