Why are my crossovers different

DIYAudio is a better place for technical questions like this, but I'll try.

First, what speaker is this?

So the schematic says 26.7uF (not exactly an off the shelf value).

When you say the actual values are 25.7 and 28.1 are you going by measured values or marked values? What are the tolerances?

The values you quote (25.7uF and 28.1uF) are 3% and 5% off of 26.7uF. Lots of less expensive caps have a tolerance in that range. It is possible they either:

a - Don't care that much
b - Actually measured the caps individually to get to the desired value.
c - Matched the caps to the actual drivers

I'm going to bet on (b) or (c) because it is VERY irregular for a factory to start changing parts willy nilly. Either they would always be over or under, or they took exceptional care to either measure the actual cap values and/or are matching caps to the drivers.

I would measure your situation carefully. Also, be exceptionally careful in replacing shunt caps. That is caps that are in parallel to the drivers and go to ground. The ESR is much more critical to the circuit design.

Best,


E

So the allowable tolerance is 2%. I was just going on what was printed on the caps 

Maybe the caps the factory used ware not accurately labelled. Question is, how accurate are the labels on the jantzen standard z caps 

It's strange  because on the first crossover there is a 10uF, another 10uF, a 4.7uF and a 1uF, making 25.7

The second crossover it had a 10uF another 10uF, a 6.8uF and a 1uF making 27.8
These are only what is printed on the caps. 
Again the schematic calls for 26.7
 
I'm thinking they likely measured each cap to make the 26.7

I think I'll just mirror the other crossover, any thoughts on this