Help with crossover capacitors

Paralleling caps to make up the correct value sounds better than a single cap as long as they are equally the same quality. Have a look at Dueland you can get those from Hi Fi Collective.

Chaps,
When you parallel caps and resistors, you also change the inductance, which may or may not affect the sound depending on the rest of the circuit.

danybad:
I would remove the shelving control and associated resistors to make the system flat , get a good air or ferrite core inductor, improve layout so the cap is not in the inductor magnetic field and anchor the parts to they don't flap about in the breeze.

Be advised that it is impossible to evaluate a capacitor [-or anything else-]  in isolation. A cap that is a bit zippy with a ringy tweeter may be dulcet with a soft dome.

FWIW, I used Dayton pp to replace mylars on ancient Audax silk dome tweets and they are stellar.

Hi @dannybad ,
You can try to bypass compression driver filter capacitor with Duelund Cu-Sn 0.01uF bypass capacitor.
I did it in my Altec 604E with vintage oil 4uF capacitor and with Duelund RS main 3.9uF capacitors. I like results in both cases.
Even in parallel with already very good Duelund RS capacitor, bypass capacitor my speakers sounded more vivid, organic, with better tone. Only drawback was it made sound a little bit less focused.
In case of  vintage oil capacitor the difference cause by  Duelund Cu-Sn 0.01uF bypass was even more positive.
Regards,
Alex.

Alex is spot on as I use the .01 Duelund tinned copper cap all the time. Only issue is they are out of your total budget unless you splurge 😊. 

It just possible option.
On the first stage to update the crossover with not expensive and good sounding capacitors.
And if you like result go to the next step of upgrade.
There are a number of options there including use good bypass capacitors.