[TenTec] Jupiter - Such a Quiet Puppy

[jimimaxi2 at comcast.net]

I have a Jupter, pre blue screen, that I purchased from Ten Tec used in October of 2007. 
I am not too technical a HAM so please no freakazoid terms in your answer. 

Why is the Jupiter so quiet on receive? 
I am not attempting to start a "My radio is better than your radio" argument. 

I can compare it personally to a Kenwood TS-480SAT and a Yaesu 817 and they are two noisy radios compared to my Jupiter. 

WHY? 

Thanks so much, 
Jim C 
KC2ROF