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Amplifier power outputs and speakers

I need some advice on matching speakers to amplifiers - I think the questions are pretty straight forward but despite much research on the net I haven't managed to find a simple answer.

First, I have just bought an Onkyo CR515.  It says it is 4 ohms impedance and power output of 52 watts.  I already have an old pair of Celestion 6 speakers that are 8 ohms and say they can cope with power output of 10 - 100 watts.  Could I use the speakers with this system or would they be too much for it?

Secondly, I also have an old Arcam Alpha 5 amplifier which is currently running the Celestion speakers (they are too large for the room they are in which is why I want to swap them).  The Onkyo came with two speakers which say they are 4 ohms impedence and maximum 70 watt output.  The amplifier handbook says it has power output of  40w both channels into 8 ohms or 80w one channel into 4 ohms.  It doesn't say anyting about two channels into 4 ohms.  Is a single pair of stereo speakers one channel or two?  And so would I be able to use the Onkyo speakers with the Arcam amp? (until I have enough money to get a better pair of speakers to replace the Celestion ones.) Would there be any risk of damage to either the amp or speakers? 

In case it's relevant I normally listen to classical / jazz music and not particularly loud.

Any advice would be very welcome.

Thanks 

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Re: Amplifier power outputs and speakers

 Either set of speakers will work perfectly well with either unit.

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