Thanks, ended up call armour and getting their spikes (£10 a set), led me to noticing my right speaker was a little 'muddy'.
Close inspection revealed the tweeter not working. Having had the little one turn the amp on at full blast the other day, I was worried it had blown.
Fiddling with the wiring didn't help, so took off the rear connection panel, nothing wrong, then the front ( the four 'grill screws' out allowed me the peel the front away slightly), enough to see one of the tweeter connections was off! Job done! Wondering how long it had been like that!?!