front speaker buzz

thuchien
thuchien Posts: 103
edited February 2006 in Speakers
i got hk7300 on ebay lastweek. After hook up I notice buzz or hum from two rti 10 front speakers. i unhook everything except only receiver and front speaker but still buzz. Do you think it because of receiver ground problem? Is there any thing i can do to make it go away or i have to return the unit.
thanks
Sony 60" XBR2
PIONEER SC 05
Samsung BD-UP 5000

7.1 SETUP
Infinity P-FR with 12" build in sub
Infinity P-CC
4 Infinity P QPS
Kef sub 4000

pure av PF60
3 cobalt speaker cables