Mills wire vs. ceramic power resistors

[Joachim Gerhard]

By the way, i can buy Isaplans very easy here so when someone wants to try them i can ship them for selfcost.

[Joachim Gerhard]

Oh yes, and there is ZYX.
They make the input resistor of their moving coil phonoamp from the same silverwire they wound their cardrige coils with !

[Joachim Gerhard]

On the midbass i whould go for a litzwire aircoil.
I think Solen was the first that made them. I use Mundorf or Intertechnik. They can also bake them in an oven to melt the laquer and make the coils very resistant to mechanical vibration because that can be an issue when you put the crossovr into the speakerbox.
A more expensive option is a coil from foil like Görz make them. the have excellent mechanical damping and low skinneffect. Sonically i find them rather dark (or is that simply less distortion ?) in series with a mid or woofer but i use them parallel to the tweeter where they work for me pretty well.

[ro9397]

Originally Posted by Joachim Gerhard

...You can fake a non inductive by mounting two resistors of double value close together, inverting the leads of one and then paralleling them for half value...

Is the following correct? For resistor value X: sum total two parallel resistors, each value 2X, one resistor inverted direction relative to other.


Re. bypassing: Has anyone heard of bypassing a capacitor bank in a speaker XO w/ 1k Ohm resistor (low wattage). A friend recommended bypassing an L-pad w/ 1k resistor; IIRC it worked well. He might have recommended same for capacitor bank of XO but unsure; he since passed away.

[ro9397]

Joachim
Are you & Allan putting those costly parts in your approximately $2500/pr USD Anima standmount? I know dealer margins & that is razor slim. That speaker does justice to the best upstream gear. I would buy them if I wasn't infatuated w/ this 2-piece bipolar standmount project.

[Joachim Gerhard]

yes, when you do the fake low inductane resistor you need two with double the value you want and reverse one in direction ceveat: in only works with wirewounds.
I never heard about bypassing capacitors with resistors so i never tried it. what i sometimes do is bypass the capacitor AND resistor before the treble unit in one go with a small value (say 0.01 - 0.22uF) MKP. i also have seen bateries in speakers that bias the elcaps.
Since Allen builds my speakers in the states he implemented some expensive improvements in the form of Eichmann jacks and very good internal cabling. The quality of the crossover is very good but not exceptional. A crossover for one single piece of the Spirit (an export model to the far east) cost us nearly 1300,-$ when we go for the all out Mundorf version so this is out of reach for the Anima. There exist an Anima Limited Edition with a top quality Mundorf crossover. Allen, Stig Björge of Lyra and David Saltz of Wire World use them as their referenc.

[Face]

Duelund makes Mills resistors sound colored in comparison. Very transparent, like not having a resistor at all.

[Curly Woods]

Originally Posted by Face

Duelund makes Mills resistors sound colored in comparison. Very transparent, like not having a resistor at all.

Are they really that good Face? I was curious about them, but their cost has stopped me from thinking about using them in my next speaker project Ekta GrandeScanSpeak 18W/. I hope to start building the cabinets very shortly.

[ro9397]

Ekta GrandeScanSpeak 18W/

Curly I would sure love to see, hear & touch the above project when completed! It's a jewel. Finish?

Ditto your question to Face about the Dueland vs. Mills...Recommended source for the Dueland resistors delivered to Utah? I'd consider them for the tweeter pads.

Again, thanks one & all for thoughful & considerate contributions.

[Curly Woods]

Originally Posted by ro9397

Ekta GrandeScanSpeak 18W/

Curly I would sure love to see, hear & touch the above project when completed! It's a jewel. Finish?

Ditto your question to Face about the Dueland vs. Mills...Recommended source for the Dueland resistors delivered to Utah? I'd consider them for the tweeter pads.

Again, thanks one & all for thoughful & considerate contributions.

Not sure yet if I will veneer or simply spray them as was done in the examples. I do have some incredible Bocote or Macassar Ebony veneer that I might use for these. I used to have a figured hardwood lumber business (hence my handle Curly Woods) so I have a lot of great stuff that I have rat-holed over the years. Need to finish my amplifier project first though before starting on these cabinets. I am torn as to whether have the internal bracing CNC'd or deal with all of the MDF dust. I have a good friend that has a CNC machine and the cost maybe worth the hassles of dealing with the damn dust. I hate MDF! I was thinking of also making the front baffle as a mixture of bamboo laminate lumber (better known as "LBL" and MDF as semi-constraint mode baffle. Troel's design does not make the front baffle as thick as I want to do it, so I need to account for this. I was thinking about a 3 3/4" thick front baffle to dampen the drivers using 3/4" panels. MDF/LBL/MDF/LBL/MDF arrangement. Jon Marsh over on the HTGuide web site recently used a similar arrangement for the front baffle of his "Ardent" build. I was torn on building it or this design. I may still build his also, but he is working on an even better design that looks like the cat's meow, but it will not happen for a little while yet. Jon seems to be one of the best speaker builders in the DIY forums that I have read about. His xover theory is really good. He had some association with Avalon once upon a time and his designs model many of the Avalon style cabinets too.