I didn't want to risk making an expensive mistake so I replaced like for like.

When I opened them up I had two 680 ohm resistors (R1 and R9) so put the same back in, however I did increase the rating to 5W.

As the speakers were manufactured in 1994 (I think), I would be happy if the resistors lasted another 23 years.

Both of the resistors in both of the speakers were crumbling so I would recommend everyone with a speaker of similar age to at least check the resistors. You may save a larger repair bill if you catch them before they fail.

Lounge: DSP5200, 518
Snug: DSP33 x 5, C61R, HD621
Office: M33