Mixing rear surrounds
 

I'm hoping somebody here in the griup may have had experience of this,
and give me a bit of advice?

I've just bought myself a Denon 2105 surround amp, and use 5 speakers
rated at 8 ohms and 150 watts (and a sub). Will it harm my amp to use
two of my old satellites as surround backs in a 7.1 configuration?
They're rated at 4 ohms and only 25 watts. I don't want to bugger my
new kit!!
2nd question- any opinions on if this will sound garbage, and should I
just wait until I can afford new higher powered rears?

Cheers,

Bossk