Linking 3-5W speakers to a 22W system?

[Jarfi]

I have this CD player, it is connected to two kind og large speakers. I have other speakers laying around that I wanted to connect to this CD hub, but these speakers are 3-5W while the hub says it is 22W. Then all of this is connected to my computer. The speakers have 8ohm resistance also, while the hub says "MIN 4 ohm". I tested linking it but the sound was kind of low, much lower then the main speakers. Can I link this or will it overheat and burn? or can I link this to my computer motherboard somehow? maybe splice the wires to some headphone base.

Any ideas on how to do this properly?

 

[berkeman]

The power rating is not all that relevant here. The power source can output a maximum of 22W with a load impedance of 4 Ohms. Your 5W speakers are 8 Ohms, so you could connect a maximum of two of them in parallel.

I would expect the sound level output from a 5W speaker to be significantly less than that from a 22W speaker.