Tweeter Capacitor Upgrade (Coincident PREs)

"I suspect the Duelund by=pass caps might give the accutrons a bit too much resolution. They are not lacking in air and extension even with the Solens, and he could end up with a hyper detailed presentation would be my concern."
It works opposite.
I put Duelund Cu-Sn bypass (in my Altec 604E Werner Jagusch Crossover) bypassing old vintage oil capacitor.
As result a lot of music that sounded bad before started sound good.
After that I replaced old vintage oil capacitor to Duelund RS capacitor with the same bypass Duelund Cu-Sn capacitor. It gave me big improvement in transparency and musicality.
After that I exchanged Belden internal wire to Duelund 16AVG Cu-Sn wire. I can say this wire is magical.

Do you have 8uF?

I'm thinking about upgrade of a second order LP filter capacitor  for my mid-bass driver.
I know the quality of inductor is very important for second order LP filter.
How much a quality of the second order LP filter capacitor does influence on sound quality?
 

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.

Hi @erik_squires ,

I get it. 

With bypass I noticed that vocals, saxophones and acoustic guitars sound not as smooth and tonaly reach as it was without bypass. It seems it cause a deep in lover mid range.

I think that vintage oil capacitors should be replaced by something that have a natural tone. I don't want to use cheap Solen capacitors. They sound too synthetic. I avoid to use them even for tube amp power supplies.

Hi @cal3713 ,

Did you give break-in to Duelund bypass?
They need more then 100 hours. 

Hi @cal3713 ,

I use Duelund bypass Cu-Sn in my HF crossover - bypassing 3.9uF Duelund RS and in the output of my phonostage -  bypassing 1uF Jupiter Cu.
And before Duelund RS I used Duelund bypass Cu-Sn bypassing vintage oil 4uF capacitor in HF crossover .
I all 3 cases I don't hear any dividing of sound by parts so typical for capacitors bypassing. In addition to that, most of LP records and CDs sound very pleasant and musical. Even some records that didn't sound  pleasant before bypassing!

Regards,
Alex.

Hi @cal3713,

I did experiment, I compared sound of my speakers with only Duelund RS 3.9uF in HF crossover and  Duelund RS 3.9uF bypassed by Duelund Cu-Sn 0.01uF.
9 month time ago when I put  Duelund RS to my crossover it hadn't passed break-in and Duelund improved the sound a lot.
Now results were different.
Without bypass sound of instruments has better focus and a little bit cleaner.
On other hand with bypass tone is more savory and vivid. In comparison Duelund RS without bypass sound more lean.
In general, I like sound of my speakers with bypass more.
Yes, bypass has some drawbacks, but it is also depends from specific type of capacitors, system and listener. If money wasn't for me an issue I would use Duelund Cu-Sn 3.9uF  without bypass capacitor.

Regards,
Alex.