Using different speakers from original system (altec lansing 621 and Sony marriage)

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Hello, so i got this used Altec lansing 621 speaker system, and one of the satellite was broken, so instead I connected a pair of 2 way sony ss scl3 Hi-fi's (full range), now there are differences between the originals, one of which is that Altec satellites where 4 Ohm and Sonys are 6 Ohm,and also a difference in power of about ~70W RMS.Now my question is, even though they sound fine, can there be any damage done to the internal Amp or the speakers themself due to compatability issues?One of them being an underpowered Amp and possibly clipping? Link's provided Sony'shttp://www.ebay.co.uk/itm/141690007822 Altec lansing's 621http://www.cnet.com/products/altec-lansing-621-3pc-speaker-system/specs/ Thank You!

 

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