using V Cap Odam To Improve SQ In mid band of speaker XO

Not enough experience with V Cap Odam In XO ?

How about using Jupiter Copper Instead of V Cap Odam In same condition

OP:

If you mean ADDING it so the total uF = 2.7 + 3 = 5.7uF, then absolutely not.

If you meant replace, then 2.7 is right on the edge of what I'd recommend trying without compensation.  I'd add a .27uF to get close to the original 3. 

An easier and cheaper alternative all around though is adding an Audyn TrueCopper cap in the range of 0.1uF to the existing. 

Erik,

Thank you for reply

Original stock value of removed electrolyte cap Is measured about 89 uF

Replacement film cap Is at 86 uF

I would like to add a high quality cap, but I am curious about value - does 0.1 uF Audyn True Cap would be enough

OP:

DIYaudio is a great place to ask about speaker design and crossover mods. In general, the % of difference is what you want to be aware of more than absolute values. If your original cap is +- 10% vs. marked, it’s still good but the original designer probably intened to use the marked, not measured cap. Especially true with older caps.

Next, if the cap is shunting to ground (parallel with the driver) , maintaining or compensating for the original ESR may matter. If there’s a large R (> 2 Ohms) in series it is less important than if there is no R or a very small R value (<2 Ohms) on it’s way to ground. In these cases the combined ESR + R are critical values which may be needed to prevent the impedance from collapsing.

Keep this in mind as using parallel caps may have unintended consequences, and the ESR of the entire assembly should be measured and taken into account.

Lastly, if this cap goes to ground the big improvements are going from electrolytic to film, and less so after that.  If you have already made that change getting fancier is a tiny difference if any.