Tweeter Capacitor Upgrade (Coincident PREs)

How much a quality of the second order LP filter capacitor does influence on sound quality?

@alexberger

Based on my reading, this can be more important than the coil, even though it is in parallel. Especially if the original is an electrolytic, replacing them with even a modest film cap like a cheap Axon or Solen or Mundorf bipolar is going to be a bigger improvement than changing the coil.

Also, changing these caps is a little dicey, especially if replacing 1980's or earlier speakers, the ESR was pretty high and changes need to be compensated for. If you have relatively recent speakers (2000+) you should be fine.
Best,
E

Hey @cal3713
What value Duelund did you bypass with?

Best,
E

@eric_squires
Audin True Copper 2.2uf -$74.18 (Parts express, commercial sales)

@bache what is your point??

Hi @erik_squires ,

Thank you for advice.

I have Altec 604"E" with Werner Jagusch Crossover.
This crossover use vintage German oil capacitors.
I already replaced HPF capacitors to Duelund RS 3.9uF bypassed by Duelund Cu-Sn 0.01uF bypass capacitor.
But for 8uF LPF capacitor Duelunds RS are out of of my range.
I want to try something like Jantzen Alumen, Z-Cap or Jupiter VT.

Today, I tried to bypass vintage German oil capacitors 8uF with Audio Note Copper 0.22uF. The sound cleaned significantly from midrange to bass. Bass became much more firm and focused. Vocals became a little bit less lush but still OK.

I’m a big fun of Duelund capacitors sound. Which of mid price capacitors can you recommend? I need sound as much as possible close to Duelund Custom Cu or RS signature.
Old capacitors ESR shouldn't be an issue, because I can adjust HPF cutoff frequency by potentiometer. (The crossover HPF has serial capacitor and auto-transformer. The input of auto-transformer is shounted by potentiometer) .

Regards,
Alex.