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Caps for crossover upgrade for Opera Grand Callas Loudspeakers

Hi, first of all excuse me for my English.
I’d like to upgrade crossover of my beloved Opera Grand Callas Loudspeakers
http://www.operaloudspeakers.com/en/collections/callas-line/grand-callas.html
I’ve got a Merging Hapi as dac, Soulution 721 preamplifier and Krell Fpb 400cx amplifier, I use pure Ag Lasound cables (http://www.lasound.it/en/)
Here you could find more information about my loudspeakers.
https://drive.google.com/open?id=0B9kNUs8PnpkEa21XMjRmaE5ZdWs
They use Scanspeak 9700 tweeter from 2khz and above, Seas 6" custom midrange from 200hz to 2Khz and two Scanspeak 8" aluminium woofers.
Woofer could be this, but I’m not sure
https://www.scan-speak.dk/products/prod-woofer/?single_prod_id=157
While midrange is very similar to this
http://www.seas.no/index.php?option=com_content&view=article&id=101:h1520-08-u16rcyp&cat...
Here is the schema of the crossover, maybe it could be quite different, I haven’t yet dismount the woofer in order to take photos, but this schema is taken from the my loudspeakers’ little sisters, the Opera Callas Diva, that are a little smaller and with only one woofer instead of two.
http://i66.tinypic.com/etil95.jpg
And here is a photo taken from Opera Callas Diva crossover.
http://i67.tinypic.com/16blocz.jpg
As you can see, and in this respect I know that it’s the same as my loudspeakers, capacitors used are Mundorf Evo Aluminium.
I’d like to change the 6,8 uF capacitor used for the front tweeter and the 10 uF used as bypass capacitors for midrange in order to obtain e more relaxing and refined sound. I’d like to have more air, more natural and organic sound without loss in high frequencies extension.
I like my loudspeakers very much, but sometimes I found the sound, especially with not perfectly recorded and mixed records, a little bit on the hard side in the uppermid frequencies, especially on female voices.
I think it could depends on Mundorf Evo caps that are known to be a little "nervous", so I think to go for a Jupite Copper Foil Paper and Wax caps for the 6,8uF (eventually with a Duelund Silver 0,01uF bypass) and maybe a Jantzen Alumen ZCap for 10uF midrange cap, I know it could be better to use another Jupiter Copper for midrange, but I don’t know if there is enough space for it.
Have you any suggestions?
For midrange caps what do you think of Jupiter VT? What are the differences between Jupiter VT and Copper Foil in terms of sound? And between Jupiter Vt and Jantzen Alumen Zcap?
Thanks.
grunter
grunter OP
9 posts
 
The impedance of my loudspeakers had to be very similar to the little sister Opera Callas Diva.
Here is their impedance and also other measurements.

http://i68.tinypic.com/dqi15z.jpg


erik_squires
16,052 posts
 
So you have good experience with Clarity Cap CMR bypassed by a copper caps. Which one?


I used the Audyn TruCopper models.


In what do you prefer CMR Clarity Cap over Duelund and Jupiter?


Cost and size! But if I could afford Jupiter copper foils I would.  Unfortunately my current custom speakers require about 14uF in the tweeter, about $800 / speaker and that's just not money I have.


Mundorf Supreme <<<<< Clarity CMR (with bypass) < Jupiter


and never heard the Duelunds. I find the Clarity has a very neutral, and very open presentation. Jupiter adds sweetness. Mundorf to my ears adds a Disney-like sheen, or scintillation quality to everything and while it’s pretty, it’s unnatural and often too cool sounding for me.


dgarretson
2,597 posts
 

Just thought I’d chime in here, as I recently installed new Duelund .01uf Pure Silver Foil bypass caps over both series and shunt caps in 2nd order crossover of well broken in ClarityCap CMR in my Merlin VSM-MXs. This is a synergistic combination of the neutrality and detail of CMR, with added warmth and bloom from the small Duelund bypass. I wouldn’t go above .01uf with this. It’s an improvement all across FR. The only downside is a slight reduction in soundstage depth. Duelund’s embellishment of the presence region is a more forward presentation. Maybe this will settle back with break-in. There is a slight loss of resolution, but no smearing or tubbiness as often found with oil caps.

ClarityCap OEM Sales

erik_squires
16,052 posts
 
Hey @dgarretson

What uF were the Clarity you bypassed?
My experience has been that below 4-5uF I can't hear any difference in bypassing them.

I also used 0.047 Duelund pure silver caps on the 10 uF caps I have. No difference for me.

I needed at least 0.1uF to make a difference, and only on the bigger caps.

I forgot if you saw the speaker I put the CMRs in. :)


Best,

E

dgarretson
2,597 posts
 
@erik_squires The series cap to the Esotar tweeter is 5.9uf. The shunt cap to the Scanspeak 8545 mid/woofer is 17uf. IIRC, crossover is around 2000Hz. The greatest change with the .01uf Duelund bypass is heard in mids to LF. The change is rather dramatic, though still a matter of taste.
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