I did some further research and may be it'll change with the system you have... By looking at the attachment below the basic has 4ohm... the Hi-Fi has 2ohm on all of speakers and the logic has 2ohm but the subs that are 4ohm...
Having said that I did not checked nor changed my speakers (I have a 10 speakers hi-fi amplified) and I base my knowledge by the info found around...
If you would be so kind to specify the system you upgraded might be worth it...
thanks
Max
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