Help with crossover capacitors


I am re-capping some Altec Lansing 890C Bolero speakers.  They have 6uf/50volt and 3uf/25 volt caps.  What will change if I use 5.6uf and 3.2 caps?  I can't find the exact 6uf and 3uf values.  Should I go a little bit higher on those values or lower?  Any suggestions?  I'm looking at Dayton, Mundorf or Jantzen caps but I'm open to suggestions.

dannybad
Be careful dannybad, a lot of people around here are eager to advise on things they have no actual experience with. Differences between caps are easy to hear. I'm talking electrically same value caps. Back when I didn't know this the designer of my speakers sold me a tweeter upgrade that called for a different crossover. He gave me the circuit which when built sounded nothing like what I had heard in his lab. It sounded like crap! After asking a bunch of questions and being assured I used all the correct value caps and resistors and point to point soldering he finally asked which caps? Well, Radio Shack. A week later with a Hovland MusicCap and Holco resistor and wow, magic! Bye-bye grain and etch, hello lovely liquid music!

Bear in mind this was going from Radio Shack caps sold five to a pack for a buck fifty, to Hovland MusiCap sold one for about $35. How much difference you hear will depend on what you're comparing. In any case, as long as your values are as close as you're saying then virtually all of what you hear will be due to the caps themselves and their quality and NOT have anything to do with the values being slightly different.

If your crossovers are working then I'm not even sure why you would want to replace the caps, as there's a lot easier/better places to put your money. That said, if the caps in there now are as cheap as they probably are then you should be able to easily hear improvement in smoothness and detail when upgrading to some quality caps.
I appreciate everybody's perspective on this as I'm sure there are different approaches and I will have to sort through it and figure it out myself and allocate my budget accordingly.
Millercarbon, I can definitely get with the idea that there will be a difference in Radio Shack caps and other more expensive brands.  I will look for a medium priced brand.  I am re-capping these speakers because they are 50 years old and I would like a fun project to do and when I re-capped a 35 year old mixing console (Soundworkshop 1600) I immediately heard a significant difference.  So, I'm just having some fun. 
Goodness Miller look at my feedback and the fact that I build and modify gear and cables for a living now. Been at this for years. Strange comment. Anyway, what I gave for advice is very straight forward, reasonable and smart.

Also, replacing those sand cast resistors with Mills MRA12 will also pay off nicely sonically. They cost $4 each. I would be willing to help you plan this out etc.... Done this for many A-goners.

I have upgraded so many speaker crossovers over the years that I lost count. I have vast experience with cap and resistor brands and have done the critical listening tests over and over. It is my particular passion and joy. See my virtual systems for some of my speaker and amp upgrades as well as tube amp builds 

Have fun.

Bill
Bill/Grannyring- I was just looking at those resistors and it's definitely worth giving it a shot at replacing.  I will include those when I do the work.  I am currently looking at either Clarity CSA caps or Mundorf Evo oil caps.  Each one will cost me about $150 total to re-cap at the same values.  I think I've got the idea, I just have to go back and check the resistors on those speakers and make sure I get the correct ratings.  I appreciate everybody's comments and ideas.  It is very helpful and is making this all fun.
HCouple of things to consider. The Evo caps have a sound signature that is more hot in the presence area. They sound a tad tipped up in the highs and upper mids and not as full bodied as the Clarity. The Clarity CSAs are more even handed in the highs and upper mids and sound more natural based on my experience. If you are looking for more sizzle and energy in the upper mids and highs the Evo would be a good choice.

Parts Connexion is having a 25% off sale and the Clarity caps are included. Perhaps even the Mundorf? You should be able to recap within your budget. The 3uf caps are $6.75 each and the 5.6uf caps are only $8.