2. tech-talk
  3. 130828-75330

Why are my crossovers different

So the schematic on my m1 crossovers says that c2 circuit (midrange circuit) should total 26.7uF
The crossover that I just recapped had the c2 circuit at 25.7uF.
The crossover I’m working on right now has the c2 circcuit at 28.1.
It does not appear these have not been tampered with since the factory.
So the question is should I make the second c2 circuit match the 25.7 of the first or should I put it back the way it was at 28.1

I could make the second one a 26. 8uF. I accidentally damaged a 1.3uF that was in the 28.1. So I’m debating on whether I should replace it or leave it out.

Your input would be appreciated
idahifi
idahifi OP
100 posts
 
Also on the 25.7 crossover the 1uF cap it said 1.0m100v,  I assumed this meant 1uF.
 On the other crossover the 1uF cap had the stripes, I punched in the stripe code online and it said it was 1.3uF-1.6uF at 100v

imhififan's avatar
imhififan
2,231 posts
 
Why not get a meter and measure the actual value of caps from both crossover and go from there?
erik_squires
16,892 posts
 
Measure what you have. Don't just mirror.

Best,

Erik
erik_squires
16,892 posts
 
You can use Room EQ Wizard, or DATS to measure your caps with high accuracy and the correct ESR.

https://www.roomeqwizard.com/help/help_en-GB/html/impedancemeasurement.html

https://www.parts-express.com/dayton-audio-dats-v2-computer-based-audio-component-test-system--390-8...

Also some handheld meters I know nothing about.

Best,

E
gs5556
1,250 posts
 
Ditto on measuring. I would take the group of 4 caps you removed from each board and measure their capacitance in parallel and that is the value I would use for the new ones.

The design value may 26.7 but chances are the manufacturer tested every driver and tweaked the caps to allow for variations in driver paramenters to meet overall design specs. (If one of the four caps is much smaller in physical dimension than the others, then that is almost certain what they did).

Without measuring the original caps, your best bet is to install 26.7uF total.
More to discover