JAM by Duelund

I personally like Jupiter copper foils as much as Duelund CAST and more than the Duelund RS. The JAM is not as good as RS .... well they are under the RS in the Duelund Line. I would go with 100% Jupiter Copper foils.  This is especially true in electronics.  Not sure if these are for crossovers or elsewhere? 

For a large value cap like that I think the best sounding large  value cap is the Mundorf EVO Supreme Silver, Gold, Oil.  They are expensive, but the best large value cap I have heard. Watch the size of the Jupiter line when the value gets big as they are huge! A 15uf Jupiter VT cap is 5 inches long! 

I also like the Clarity CSA as Audioman68 mentions. Not as good sounding as the Mundorf above, but still good and very affordable. 

I don’t like mixing brands ands materials of caps in speaker crossovers. I would stick with one brand/type. You can combine the same value to get your end value. Best to split evenly such as two 10 uf.  10uf and 5uf is also fine. Be sure to get them matched within 1%.  Sonic Craft will do that.  

Correct @audioman58    However when large value caps are needed and space is tight these are oftentimes one of the best options.  Another good option is Sonic Craft Gen 1.  

@radiohead99

You are referring to a different Mundorf cap ... Supreme Oil, Silver, Gold. I am referring to the Newer EVO Supreme Oil, Silver, Gold. They are very nice. If you want smooth over detail, then the Jupiter VT cap line is the perfect choice. They get big fast, but you could combine with Clarity CSA.

Be sure to give any cap you put in at least 200 hours before making any initial judgements. Many take up to 500 hours to sound as intended. They can change substantially and often do. I find they get better up to 50 hours and many then go south and sound pretty rough until you cross 100 hours. This is real and I have tested and heard it over and over.

Another good cap cap for the money is the Obbligato Gold. Very smooth.

Duelund wire, copper stranded, cost $9 meter for 16ga. 🙂 Great wire for speaker internals or outboard crossover if you need 15-60 meters of wire! That’s what my last two upgrades needed. I can only imagine what the total bill would have been for 60 meters of said Verastar. I bet it is good indeed. Like to use it if were affordable.

Just order two Path Audio and put in parallel. They will now handle 20 watts. Two in parallel always sound better than one! If you need a 4ohm resistor, example only, put two 8 ohm in parallel for your 4 ohm spec. 

Agreed on a Path Audio as they are quiet and even handed throughout the frequency spectrum.  . Best resistors I have used. I like the Mills MRA12 better than Mundorf, but both are good. Mills are nice and extended, but never bright.  

I have compared Jupiter copper foil to the RS and CAST. I just prefer the Jupiter by a wide margin over the RS. The RS sounds dark compared to the Jupiter. The Jupiter is more open, airy and better micro details. It does this always with a natural richness and smooth presentation. The CAST as very good and I find the Jupiter a little better in the micro details and airy top end while the CAST is a tad more organic and midrange resolving.

The Jupiter’s are far more affordable than the CAST however. My all time favorite is combining a Jupiter copper foil with a Duelund Silver foil bypass cap. Pure heaven and better than the CAST for less money still. All my opinion😁.

The JAM are not at the same level as the Jupiter copper foil just by where they are in the Duelund Line and how Jupiter compares to the CAST higher up in the line.

Jupiter is far from thin sounding as an FYI. It is lush, sweet, and has full bodied tone. Still my favorite! Better bass than Duelund in electronics also. That has been my experience. 

Yes these well damped, large and dense caps all take a good 300-500 hours to fully burn in. They will sound good after 100 or so and just continue to open up a get better. The larger the cap value the longer....closer to 500 hours. Many don’t wait long enough and change things far too early. They will sound good right away and up to 50 hours. At 50 hours or so things go worse unexpectedly. Yes, frustrating but true. However at 100 hours or so they start sounding good again and just keep getting better with time. This has been my experience and trust me when I say I have been through this cycle many, many times and know from experience.

I wish this were were not true as some think. However, it is the case and real on these caps.

They do need more time to break in with music.  500 hours with music. Pretty sure your cooker time fell short of that. These do take all of 500 hours to sound their best. Not sure what the cooker equivalent of 500 hours is? Not sure if it even gives the same result? 

Yes that is a wonderful thing to get most of the burn in behind you once a part is put in place. I do wish a had such a device.

I will look at it now. 

Jupiter goes south in sound quality right around 50 hours. Music sounds thin and just not right. They sound much better from 0-50 hours. Strange, but true. At around 100 hours thry just start getting more open, natural, relaxed and bloom. This all gets slowly better past 300 hours and at 400-500 they are set.

The Duelund bypass gives them more of the Duelund CAST realism and organic mids and highs. The combo is very special. More of a inner glow.

No, I only used them in crossovers and on the output of a digital amp....parallel position where it acted as a filter.  

You can use the Duelund .01 uf bypass caps on smaller value high voltage caps in electronics coupling and output positions as well as speaker tweeter and midrange caps as large as 15uf etc.... I have used them in both with good results. 
 
I have not tried the  small Juputer caps in bypass positions.  

I used them in both. Yes they are fantastic in both passive crossovers and electronics.   

The Auydn is also very good and I also suggest just adding the Duelund silver bypass cap.  Best option for you really.  

Bypass AG for your use.  

I tried both and prefer the silver foil bypass caps.  Combined with the Jupiter copper foil they are magic. Never thin or bright, but full bodied with amazing clarity and tone.  This combo is my favorite on tweeters in crossovers also. 

Love to help, but need more info. Please tell us the speaker in question and what you want to gain from the upgrade? What sound quality attributes are you wanting more of or less of? Thanks!

I really don’t know that speaker at all.  Looked st some online stuff on them, but not much available.  Did you already mod them? Placed the crossover outboard?