Are those four channels, HD channels ?
Have you tried turning up the volume ?
some HD channels I get...have lower sound than regular channels for some weird reason...
I hope it's nothing more...
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Outlaw 1070-Mirage M-290(main)+MCC(center)+Omnisat Micro(sides) nanosat(back)+ +PS12-90(sub)-Technics SL-5 turtable+Cambridge Audio 540P-HTPC - SamsungDTB-H260F HDTV tuner - Optoma HD 20 +100' Draper screen -lots of spaghetti and toys