Tweeter Capacitor Upgrade (Coincident PREs)

Here is my thinking:

4.7uF :
Clarity CMR : $54
Jupiter CF: $265

0.1uF:
Jupiter CF: $63

Audyn : $20 (Parts Express)

So somewhere in there I think the OP can find a fine solution. :)

Thanks for the recommendations everyone.

@justanotherhifiguy Isreal states that they use Mundorf in current models of the PRE, but my pair (I purchased used) just have Solens.  The frankenstein amps also have solens throughout... although to be honest I tried replacing with Duelund and didn't like the result.  

@erik_squires Lots to think about in there... I'm very torn.

@audioman58 And fortunately there's nothing else really to change.  The PREs only have that one 4.7uF capacitor on the tweeter.  The midrange is directly wired to the binding posts and the the bass just has a single inductor coil.  

Cal3713
for sure change the binding post which are Brass to a Furutecor WBT next gen Gold over Copper ,and put in a Quality Wire the tweeter and mid are connected to. The inductor to create
the Xover ,and you can put in a much better inductor 
to a awg 12  Jantzen inductor far better especially for the Bass
i would think there is another inductor there somewhere as well as resistors, pull out the midrange and woofer you will see other things hiding in there. I have found that to be true case up grade 
the resistors Path Audio, the best if parts connecxion has them in stock, Ohmite Gold, Mundorf Supreme, or Mills 
resistor ohms rating on the resistor. It’s up to you.
best of luck  and use a good soldering station recommend at least 
80 watts and Cardas,WBT, Johnson’s, or Mundorf Silver Gold 
minimum of 5-5% silver solder content Cardas has. Flux built in
which helps a lot  to clear and bond surfaces.

In my extensive use of capacitors in components meaning DAC, preamp and power amplifiers, but not in speakers, I find the best capacitors are V-Caps (Oil & Copper versions).  I find that the Jupiter copper caps have an emphasis in the mid-range.  They have a very musical sound but the mids standout at the expense of the other frequency ranges.  Just more focus in the mid-range.  One of the manufacturer of panel speakers that I partner with also used the Jupiter caps and when I told them to try the V-Caps, they were surprised how much the sound staged opened up with greater detail and separation of vocals and instruments.  Another Audiogoner had Jupiter in his preamp and he herd the V-Caps in the components that I build where we swapped out the caps.  He heard the differences and decided to try the V-Cap coppers in his preamp versus the Jupiter capacitors, he also noticed the same advantage.  BUT it comes down to the sound you prefer and you also may have to try both to see the benefits in your own system.  Happy Listening.