diferent ohm on one receiver?

[BiZKiT]

ok so this is my setup...sony 5300es receiver, CAV 288 4 ohm front, cav 870 8ohm front and cav DS-25 4ohm surround + 2 x 8" woofers

so i want to upgrade to CAV DS-28 6ohm surrounds but is it wize to has all these different ohms on one receiver? the DS-28 are infact the set that goes with the CAV 288 ohm fronts but they are 6 ohm ???

please help as i will be going to look at the set today...

 

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