I have had 1150,1200 Air cooled, 1200 LC and 1250 LC and they sound like a bag of nails without ear plugs, hence I always wear them or Earphones with music, even better....
I heard my 1250 on tickover the other day without ear plugs for the first time. I thought, 'Jesus! I've got to get this sorted.' So I just put my ear plugs back in.