Earlier this week one of the speakers in my second system (Celestion 5's) went quiet. Had a look behind panel on the rear, and without wanting to baffle anyone with technical jargon, a wire connected to a cylindrical shaped object that looked like wound copper wire wrapped in masking tape, had separated. Time to try out a soldering iron my girls bought me two Christmases ago. Watched a You Tube 'how to' video on how to "soder" (he was American), I gave it a go...and it worked!

I'm so pleased with myself, and it got me thinking about the other bits behind that panel. Trouble is, I don't know what I'm looking at. Apart from aforementioned item (about the size of a thumb), there are two cylindrical shaped object, similar in size to an AA battery but a bit shorter, which are bright blue and have numbers printed on them, also a white thingy similar in size to a lego brick.

Would changing any of these things bring about an improvement in 30 year old speakers, or should I leave well alone?