In article ,
nigel.bywater wrote:
I have just bought a new mini Hi-Fi, nothing special just a Sony
MHC-RG220(£130). I have the speakers supplied with the new unit(120w I
think) the cable for these is too short, do I just extend it?

Use cable of the same gauge or thicker. Observe the polarity.

I have 2 other pairs of speakers, can I use these instead? if they sound
better. Does the resistance need to match the Hi-Fi, or something?

You should be ok. But don't run two sets of speakers from the one outlet
unless it says you can do this.

Any tips on learning more about Hi-Fi and televisions, as I have just
started working for a repair company.

Maplin have several books on basic electronics.

--
*Support bacteria - they're the only culture some people have *

Dave Plowman London SW 12
RIP Acorn