I had this faucet installed by a plumber this week.  When the faucet arrived, I thought it looked huge compared to online photos.  It's just thicker and overall a large faucet.  I am happy with the purchase.  The only thing that stands out as a mystery, is when I turn on the water, there is a humming noise as the water flows through the faucet.  It can be annoying at times.  Does anyone know why there is a humming noise?