Not a whole lot of difference according to the DecibelX App on my iPhone SE2 in noise coming from the fan on the two EB832 readings from the same energy bar. Top reading before sending in the energy bar to NS. I Thought there was a lot of noise coming from the fan so Neptune Systems simply said send it in and we’ll check it out. Funny thing: bottom picture shows a reading of almost 7 decibels (I am not an audiologist) lower but the noise is considerably less from what I remember. Unit is in the dining room and I’m in the kitchen, next room over and no household appliances running. It is barely noticeable from the kitchen !!!!