I had an annoying buzzing coming from my rear speakers, so I decided to break out the socket set and investigate.
It was easy enough to remove 4x torx and get the speaker grill moulding thingy off. On careful inspection of the speaker I found a tear in the soft edge ring that joins the paper cone to the edge of the unit.
I decided to stick a blob of glue onto it to stop it flapping and buzzing, and after it had dried, I put it back in place but kept the grill off for the time being.
It seems to have stopped the buzzing, and there's a LOT more treble and clarity without all that plastic in the way! I'm going to take the moulding off the other side too, and hope the kids don't poke them... the sound is MUCH better! I might wrap some black fabric - an old sock or something - around them to keep dust and insects out.
A tweak in the mid-range cuts out the harshness, and a large boost in the upper treble goes some way to actually getting some treble through the FM link.
If the glue repair doesn't last, can anyone recommend new speakers to replace them?
I'm still using the factory-supplied head unit, fed from an MP3 player and FM transmitter, which sounds suprisingly good after careful tweaking of the EQ on the player (boosting the upper bass and throttling back the low bass which you just can't hear well in a moving car so it achieves nothing but upsets the speakers).
I can still feel satisfying bass from the door panels if I lean my knee against it while driving, the treble clarity was lacking but it's much improved without the rear speaker grills and the front/rear fader set to R2.
The mp3 player is a Sansa clip with 1200 tracks on it so far, clips nicely to the sun visor with all the FM transmitter and power feed gubbins hidden away in the Modutop above my head (power comes from one of the 12v sockets up in the modutop - which isn't ignition-switched, so I've got an inline switch from an old table-lamp flex stuck in place with blu-tack which I have to reach up and switch each time, LOL, even though the transmitter has an auto-power-off I feel happier removing the power myself).