M100-2 crossover capacitor values

17 replies
TH
Offline
TheFinisher
Bronze
Posted April 9, 2023 at 07:17 GMT
#1642163
Hi guys ,

had a little bit of time this weekend to check over my M100-2’s speakers, the previous owner did mention that he had recapped the crossover ( and maybe the coils )

now I have a concern as none of the capacitors on the crossover match a schematic that I have , which do I trust ?
does anyone have a photo of their crossover please?

 
TH
Offline
TheFinisher
Bronze
Posted April 9, 2023 at 19:42 GMT
Edited April 9, 2023 at 19:46 GMT
#1655458
Update!
now I’m even more confused as I count 11 capacitors on my crossovers but there are 16 according to the schematic

GL
Offline
Glitch
Bronze
Posted April 9, 2023 at 20:33 GMT
Edited April 9, 2023 at 21:44 GMT
#1655459
It looks to me that there are 10 bipolar capacitors on the schematic and "10" on the actual crossover board. I'm assuming that the two capacitors to the right left of the "50" on the board are wired in parallel and should be counted as one.

The other caps are (likely) the white boxes, yellow components and the electrolytic on the bottom of the board.

Glitch

 
TH
Offline
TheFinisher
Bronze
Posted April 9, 2023 at 20:47 GMT
#1655460
Hi Glitch , thanks for the reply. There are 2 soldered together to left of the 50 , thing is none of them match the values of those on the schematic.
GL
Offline
Glitch
Bronze
Posted April 9, 2023 at 21:51 GMT
Edited April 9, 2023 at 23:41 GMT
#1655462
The former owner may not have been able to find the exact values and substituted the next closest values.  Piggybacking the capacitors in parallel is one way of getting a value closer to the original.

Post a table of the installed values versus the schematic values. This will make it easier for those that want to help to give better advice.

Glitch

 
TH
Offline
TheFinisher
Bronze
Posted April 9, 2023 at 21:54 GMT
#1655463
I’ll do that thanks
TH
Offline
TheFinisher
Bronze
Posted April 10, 2023 at 07:03 GMT
Edited April 10, 2023 at 07:03 GMT
#1655469
So it would appear that you are correct.

is it ok to do so ?
they do sound very good , I mean end game speakers.

Surely the wrong values will have some effect on their performance?

Schematic               Capacitors currently installed

C2 16uf                     2x 8.2uf

C3 50uf                     47uf

C4 5uf                        4.7uf

C5 8uf                        8.2uf

C6 50uf                      47uf

C7 16uf                       15uf

C8 8uf                         8.2uf

C9 12uf                        15uf

C10 50uf                     47uf

C11 4uf                        4.7uf

 
premiumverum
Offline
premiumverum
Bronze
Posted April 10, 2023 at 08:45 GMT
#1655472
This is fine. The original caps have values that are not available anymore. Tolerances on these 1970s caps were +/-10% probably so e.g. 47uF instead of 50uF is close enough. Everything the previous owner installed is within spec.

Proof of the pudding is in the eating, as you said they sound very good. Close em up and start enjoying!

Location: Netherlands

TH
Offline
TheFinisher
Bronze
Posted April 10, 2023 at 11:52 GMT
Edited April 10, 2023 at 11:52 GMT
#1655476
Done just that , and saved over £100 by not replacing ?

 

Thanks
GL
Offline
Glitch
Bronze
Posted April 10, 2023 at 15:06 GMT
Edited April 10, 2023 at 16:15 GMT
#1655481
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