[Tom899]

Hello fellow members, I have a pair of MoFi 888 speakers for L/R, and a MoFi 8 for Center.
Last week I ordered Danny's kit for the MoFi 8. I decided on the upgraded kit with Sonic Caps and better Super-Q-Coil. I think this kit also comes with a Bypass cap on the tweeter circuit?
Because of component sizes, I decided to build the crossover in a external enclosure. I know this is not necessary, but I choose to go this route.
I'm hoping my kit ships out this week. I will supply pictures when finished (minus component values).
Tom

[Hobbsmeerkat]

There are no bypasses in the tweeter circuit, you would need two of them in order to bypass both caps in the tweeter circuit.
But it is something you can add if you would like, like a pair of 0.1uF Miflex, Duelund or Jupiter copper-foil caps, or even Silver if you want a little more "sparkle" up top.

looking forward to hearing your thoughts and feel free to let us know if you get stuck or have any questions.

[Tom899]

There are no bypasses in the tweeter circuit, you would need two of them in order to bypass both caps in the tweeter circuit.
But it is something you can add if you would like, like a pair of 0.1uF Miflex, Duelund or Jupiter copper-foil caps, or even Silver if you want a little more "sparkle" up top.

looking forward to hearing your thoughts and feel free to let us know if you get stuck or have any questions.

Hi Hobbs, thanks for the reply, and offer of help if I get stuck. The reason I was inquiring about a bypass cap, I think Danny’s video shows one being included in the kit? I think? I could be wrong, or it could be for something else?

[jmimac351]

Hi Hobbs, thanks for the reply, and offer of help if I get stuck. The reason I was inquiring about a bypass cap, I think Danny’s video shows one being included in the kit? I think? I could be wrong, or it could be for something else?

Tom, I have some extra JB bypass caps that were sent with other projects.  If you need some, message me your address and I'll send you some for free.

Or, I would use these:

https://partsconnexion.com/duelund-capacitor-0-1uf-630vdc-cast-cu-series-pure-copper-foil-wpio/

[Hobbsmeerkat]

I looked at the schematics for both versions to confirm, and only the "base level" has bypass caps in the tweeter circuit.

[Tom899]

I looked at the schematics for both versions to confirm, and only the "base level" has bypass caps in the tweeter circuit.

I’m sorry, that’s my confusion. I didn’t realize only the base kit has bypass.
Thanks for checking!
Tom

[Tom899]

Tom, I have some extra JB bypass caps that were sent with other projects.  If you need some, message me your address and I'll send you some for free.

Or, I would use these:

https://partsconnexion.com/duelund-capacitor-0-1uf-630vdc-cast-cu-series-pure-copper-foil-wpio/

Thanks for the generous offer! For now I’ll go with the kit contents.
Appreciated,
Tom

[jmimac351]

Thanks for the generous offer! For now I’ll go with the kit contents.
Appreciated,
Tom

Anytime Tom.  Something to consider... many "clip in" the bypass caps, and .1uf is "bypass cap value" and useable across the board it seems. 

Since you can clip them into the network and remove them, you can play with them with other speakers as well... "take them with you" if you decide to see the speakers down the road.

Copper foil bypass caps on Sonicaps with soft dome tweeters... it sure sounds good to me.  So, if you want to play down the road, you can check those out. 

By the way, if you haven't experienced "break-in" before... you are getting ready to.  It may sound a bit grainy and just "unpleasant" at first, there will be things that bite at you a bit and create "discomfort"... and you may notice when you fire up the system after not playing, things may sound FUZZY and then clean up after the first song or 2... caps just getting Happy.

And then... you will realize that things are just better... more pleasant... ease.

For me, that comes around "in a few weeks"... which for me is 150-200 hrs of play time.  My system plays for at least 8 hours/day. 

Enjoy those speakers... I'm a sucker for an 8" 2-way and would like to hear what Danny did with those someday.  I've really been impressed with the coherence of the LS-Encore with driver center spacing... I bet that SourcePoint is pretty cool. 

Have Fun.


 

[Rikard Ekval]

There are no bypasses in the tweeter circuit, you would need two of them in order to bypass both caps in the tweeter circuit.
But it is something you can add if you would like, like a pair of 0.1uF Miflex, Duelund or Jupiter copper-foil caps, or even Silver if you want a little more "sparkle" up top.

looking forward to hearing your thoughts and feel free to let us know if you get stuck or have any questions.

Hi, am I wrong or haven’t you said once that a bypass cap works as long as it’s lower voltages then the original cap? Dayton.
 Just checking the Miflex, that are 600volt.

[Hobbsmeerkat]

Hi, am I wrong or haven’t you said once that a bypass cap works as long as it’s lower voltages then the original cap? Dayton.
 Just checking the Miflex, that are 600volt.

No, bypass caps will still work just fine regardless of the voltage rating.
(Though, we do generally prefer lower-voltage caps when possible, but not all manufacturers make 250V variants of their caps)

[Soonerbass]

    Hi. Just dropping into this. I do not believe you should have to worry about the voltage in this instance.Typically anything that is above 50 volts is fine. I have Jupiter copper that are 100 Volt in the tweeter circuit and an 800 volt Jantzen Superior on the woofer. No problems.

[jmimac351]

Hi, am I wrong or haven’t you said once that a bypass cap works as long as it’s lower voltages then the original cap? Dayton.
 Just checking the Miflex, that are 600volt.

Many also use copper foil caps to upgrade inside equipment, and the voltages are generally higher in those applications.  In a speakers crossover network, you can use lower voltage caps, and there are benefits to that for the application. 

See this PDF from Jantzen.  They give a nice explanation of what's going on... i.e., "Lower voltage caps use thinner film, which makes them faster caps... they release their energy faster... faster is better."

https://jantzen-audio.com/wp-content/uploads/Alumen-Z-Cap.pdf

============

PRODUCT FEATURES
The Alumen Z-Cap is a high-end pure aluminum foil capacitor,
designed specifically for passive crossovers (tweeters and midrange
drivers).

It utilizes a much thinner dielectric insulation compared to the
market standard.

A high voltage rating is not needed for application related to
passive loudspeaker crossovers.

The usage of a thinner dielectric insulator allows for a
capacitors with less “memory” and one that is much faster
reacting.

The Alumen Z-Cap offers unparalleled value for money in
terms of cost versus performance.

Compared to the Superior and Silver Z-Caps (Super MKP /
double metallized polypropylene foil) capacitors, the Alumen Z-Cap
will bring less brightness and a little more natural top end balance to your
system.

Ideal for audio aficionados who prefer a slightly less bright
system, while also hearing improvements in the overall
naturalness/neutrality of the whole system.

Due to the max. 100 volts DC voltage rating, we advise customers to be
mindful when using Alumen Z-Caps for tube/valve and power amplifier
application.

For upgrading the coupling capacitors in amplifiers, we instead recommend
choosing our Superior or Silver Z-Caps (Double-foil Super MKP capacitors).
2 / 6
KEY INNOVATIONS

• We use the thinnest possible dielectric insulation to eliminate
memory effect in the capacitor

• An extremely fast reacting capacitor

• Very low ESR, SEL, inductance and dielectric absorption data

• High quality pure aluminum foil wound with high precision using
specialized winding machinery

• Specifically designed for the tweeter and upper mid-range sections
on passive crossovers

• Can also be used as coupling capacitors for transistor amplifiers

[Rikard Ekval]

No, bypass caps will still work just fine regardless of the voltage rating.
(Though, we do generally prefer lower-voltage caps when possible, but not all manufacturers make 250V variants of their caps)

Thanks for the information from all of you. Forums are great.
 Jimimac351, I read in another post from Tyson that he also recommended the Jantzen Alu to be used in the midrange. As a bypass that sounds great and a little more affordable to the Miflex and only 100volt.

[jmimac351]

Thanks for the information from all of you. Forums are great.
 Jimimac351, I read in another post from Tyson that he also recommended the Jantzen Alu to be used in the midrange. As a bypass that sounds great and a little more affordable to the Miflex and only 100volt.

I've never heard the Alumen caps, but a person I know who builds crossovers likes them, we have similar tastes, and has heard a lot more than me.  We are both using the same network below on a project - it's an 8" 2-way.  For this same network, I just bought a pair of 4.7uf Sonicaps to go along with 10uf JB JFX caps and green Dayton Audio resistors. I got that stuff because it's the same parts that are in my Wilson Duette crossover Danny did... and I want to compare the speakers directly using the same parts.  I will have Sonicap on the tweeter with Duelund copper foil bypass.  JB JFX on woofer.  Those won't be the final parts I use in the project, but I'm comparing 2 different 8" 2-way speakers with soft dome tweeters.  Whatever parts I can buy from GR-Research, I do.  If I need Sonicaps, air core inductors, or Dayton resistors - I call Hobbs and buy from GR.   

JB Cap also has some aluminum foil caps, but their distribution network is quite poor... they are hard to even get the aluminum caps without a special order.  It's too bad because the price is good... it would be interesting to hear them as I think the JB JFX caps are very good - especially for the money. 

If you want to go exploring a bit, checkout HiFi Collective in the UK and Parts Connexion in Canada.  Outfits like Andersen Audio are a Duelund dealer and can be handy for looking up parts as well, or buying Duelund specifically.   

For those places, I look for stuff like Duelund CAST-PP and Duelund JDM-PP... those are newer poly caps from Duelund at very nice prices - even compared to Sonicap.  Also resistors like Duelund and Path Audio (have not tried yet), copper foil inductors, etc.  For the more exotic stuff, you may find you are looking around the world.  Fortunately, ordering from HFC in UK or PC in Canada only takes a few / several days for shipping... it's easy. 

Jupiter has copper foil parts as well, but  I have not tried those.  Parts Express can be handy for resistor / inductor values hard to find.  Solen in Canada is good for sourcing parts / air core inductors.

On FakeBook, Duelund is posting pics of Duelund JDM-PP caps going into VERY expensive speakers.  They appear to be serious about offering top shelf poly caps at great prices... not just "expensive copper foil". 

If you start playing with this stuff, you may find it's a bit of an easter egg hunt, depending on what you're looking for. 

Have Fun.