BEST HARMLESS/SIGNATURELESS SPEAKERS CAPACITORS.

When I added Duelund bypass caps to my speaker's crossover I thought I got a bit better tonality, but also some "smearing" in the imaging.  In the end, I preferred without the bypass.  I did like the bypass cap on a coupling capacitor in my amplifiers though...

Dear @cal3713  : Other that the speaker designer for an amateur person as me is way dificult trying to improve the speaker quality performance level.

The speaker drivers , especially tweeter and midrange,  has its self signature where the designer adds the passive crossover parts to achieve the " tonal balance " he is looking for ( obviously that the box, wiring and other speakers design characteristics are way important too. ).
With those passive parts he can " tame "  his speaker targets and he knows a precise electrical parameters limits where each driver is more " confortable " to work. These information I just don't have it, I only have my ears and listening audio life experiences of MUSIC and audio systems.

Through the years just from the first time I " touched " my ADS crossover speakers I mantained all the passive parts at its original values.

I'm lucky enough that through so many times changing its passive parts I still have the original ADS tonal balance ( great one. ).

The changes in passive parts were and are not to " tame " or change the ADS signature but only to achieve a better way better quality response/Performance levels over the very wide frequency range where those speakers runs.

Like you I found out that those very expensive by-pass caps in the crossovers makes more harm than a true improvement.

As the speaker drivers all passive parts has its own signature and we have to live with but if my target is to preserve the ADS original tonal balance then what I need are the best harmless and signatureless/colorless passive parts and these is what I was and am doing till today.

Yes Dueleund are very good as many other expensive caps, things are that does not likes to my ADS drivers where the Alumen Z works really better not different but better.

I decided to delay a little the tweeter/band-pass/midrange caps and I will make a change with the woofer caps choosing between the CMR, Auricaps and Audyn. Of course I will need to test all those caps directly in the speakers mantaining the AlumenZ to decide which ones will stays " forever " on those woofers.

We will see what happen in the near future about.

R.

The first speakers I used to experiment with caps came with auricaps LSA statements towers with ribbon tweeters. I first tried to keep auricap family so I moved up to the Auricap XO in the tweeter the XO's are better, more refined better stage and not as tipped up. I do prefer the Jantzen Z's and CMR' that are in them now. The XO's are very nice can't go wrong with those either.

Dear @paulcreed  and friends: I was and still am hunting hard for first hand experiences with caps at the bass frequency range, looking for opinions that could give me a " tiny " signs of quality differences on that frequency range and believe me just does not exist almost nothing in specific to that regards.

Almost everyone talks about mid-range/high frequency ranges.

Reading " between lines " on speaker caps tests/evaluations  I think I will start with the Audyn Reference.
 Audyn Reference is more expensive than the XO or CMR but my amateur  " instinct " tells me could be a little better than the other two names in that bass frequency range.

For me that frequency range is critical for the overall " true " of the MUSIC. Yes, normally we are more " impressed " by the midrange or high frequency ranges but the foundation and neutral tonal balance starts at the bass range. 
As " cleaner " this bass range as better the other two frequency ranges and obviously the whole speaker quality performance levels.

I really appreciated any opinion/first hand experiences for bass range caps.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.