A few months ago I acquired a pair of Monitor 5b's (built 1985) and one has recently developed a rattle. I thought it was coming from the PR and had solved it by pulling the driver and rotating it 180 degrees. However the rattle is back and from other posts here it may be the magnet is coming loose on the MW (?). The offending speaker has a MW6502 in it. I also notice the MW in that speaker has far greater excursion than its mate does. Tweeters are SL-2000's.
The fellow I got them from had used picture-hanging wire fished behind the two top screws in the cross-over / terminal cups to hang the speakers ... which probably means they were used for years without a proper sealed enclosure (and probably fell of the darn wall at least once!) ... had I two brain cells to rub together when I bought them I probably should have passed on the sale altogether.
Also I picked up a pair of Monitor 10a's last week. Alas, both MW's in one are frozen. Both speakers have MW6600X's in them (which from what I have read here, weren't used in the 10 series ???). Tweeters are SL-1000's.
Any ideas on further troubeshooting the rattle in the 5b's? Would a poor seal on that one speaker, perhaps as a result of the hanging, be a cause for higher excursion and rattle?
Any chance of using the 2 good MW6600X's in the 5b's, or assuming the rattle is tracked down to a source other than the MW, could the 6502's be used in the 10a's. OR, would it be worth it to obtain replacements for the bad MW6600's and (maybe) the MW6502?
Perhaps one other consideration is that, if I am correct in what I have read, the crossovers in both models are compatible with the SL-2000 and SL-1000's, but since the SL-2000's are physically larger they would make the better "spares" to keep for the 10a's?
Sigh ... so many questions!
Regardless, the enclosures on both the 5b's and the 10a's are fairly rough and I figure I will refinish what ever pair I keep. The 10's I figure would be easier to do (in real wood veneer) as there is no beveled edge to deal with.
The 5b's set me back about $75 (probably too much!) but the 10a's only cost me $5!