The Marco-boy main system, as of August 2020

[User211]

Thanks, Justers, that's also very useful info[emoji106]

Marco.

Probably bollox. But factor it into your equation

[Marco]

Yeah, dude, but der's skanky-ass, playin' at it bollox, and PRIMO bollox... Dat's PRIMO quality bollox, no shit...

Marco.

[Wakefield Turntables]

My 15's had a cap value of 4.7uF. I have a later version of 15's than yours. I have no idea why yours is 12uF and mines 4uF's, the dudes at celestion must have had good reasons. I replaced the old knackered 4.7uf caps on the XO with the Jantzen's and loved the sound. I then wanted to try the Duelund bypass caps, I bought a pair and then bypassed the Jantzens, I can see a lot of members rubbing their heads at this point. Well, it worked very very well indeed and I have no intentions of doing any further modding to the 15's XO. The bypass cap has a very very low value so that all the original XO cap values are maintained and the voicing is kept in place. So I didn't work out the optimal value. All bypass caps have similar low values. Hope this roughly explains things.

[Marco]

Makes sense, mate. So do you think that 0.1uF, as bypass caps, would work the same with my 12uF originals, as they did with your 4.7uF, or would a different value be required?

Marco.

[Wakefield Turntables]

They should work with original caps. It's always worthwhile getting your xo cap values checked out and making sure they are 12uf. Mine had drifted away from 4.7uf markedly. The Jantzens had +\- 2% tolerance to the 4.7uf value I needed and they actually measured within 0.5% tolerance. I'm not sure what tolerances your old caps on your xo should be probably somewhere between 5-10%. The bypass caps have a very low nominal value, this should keep any desired tolerance very very close to what's needed for your xo, in my instance 4.7uf and in your instance 12uf. I can't understand why a speaker designer would want to use a cap with a specific value only to use something with a 10% tolerance of the value needed. Surely the desired voicing of the speaker is going to be dramatically effected? So my logic was to use something that got me very close to a value of 4.7uf.

[Beobloke]

. I can't understand why a speaker designer would want to use a cap with a specific value only to use something with a 10% tolerance of the value needed. Surely the desired voicing of the speaker is going to be dramatically effected? So my logic was to use something that got me very close to a value of 4.7uf.

I can answer this one - because the 4.7uF Jantzen Silver capacitor is £20 but the same value in their budget MKT range is £1!

When the speaker it’s going in is a budget model, that extra £19 is just not viable economically.

As to the 10% tolerance affecting the voicing of the speaker, its effects will be minimal. It will contribute to the sound far less than the natural and unavoidable physical differences between one drive unit and another.

[walpurgis]

As to the 10% tolerance affecting the voicing of the speaker, its effects will be minimal

Quite probably to the point of being indiscernible.

[Wakefield Turntables]

Thanks guys For the explanations.

[Marco]

Ok, then... 0.1uF bypass caps it is! Now to decide on which sexy-ass babies to strap-on...

Always fancied trying some nice paper-in-oils in loudspeaker crossovers, so now's my chance!

Marco.

[Marco]

Ok... The deed's been done! Decided to go one better than the PIOs I was looking at, and try these Jupiter Copper Foil Paper & Wax jobbies: https://www.hificollective.co.uk/com...il_in_wax.html



Loved the description of the sound:

"Wax with very special sonic characteristics, better damping and thermal characteristics was chosen as a perfect match. Further, new lead termination technique has allowed the music to flow more naturally. Without exception, every detail has been tailored to this specific copper capacitor design. After four years of refinement Jupiter Copper Foil capacitors are here.

Life like vibrance gives the feeling of presence, along with micro-detail, holographic bass, and aural decay that is disarmingly natural, the ears will know immediately."

...so couldn't resist!!

And I'll be replacing the stock binding posts with these copper CMCs, which seemed really good value: https://www.hificollective.co.uk/bin...terminals.html



Full report to follow once Dazza's visited and wielded his trusty soldering iron!

Marco.