Which cable

I have a Sanyo entertainment centre,  a quality all in one system with cassettes,  equaliser etc. I have expanded the system with some boom box 3000 bass speakers and I'm thinking of using some left over wire which I think originally came with the door bell. Do the other members think this will be suitable.

I think you should buy a pair of $9,000 Nordost cable.  Think everyone would confirm.
What grannyring and elizabeth have indicated is sufficient.
It is great that you are giving consideration to cable and sound considerations for your Sanyo system.
Even my wife noticed ... isnt that the truth. Haha . Such an improvement was made even a non liar noticed the difference !!