 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
104.35.189.164
In Reply to: RE: A $5000 speaker with .50 cent caps posted by seancuster71@gmail.com on September 18, 2024 at 23:03:41
Guilty of that here.
Funny when it's written, but it's more true than I might want to admit.
Not really sharing your observations on little sound difference ,but I also don't succumb to " costs more so better"
I don't have first hand experience with that resistor, is it a variable type, R value changes with clamp location ?
Follow Ups:
It's a fixed resistor.
it's a variable one depending on the position where it's clamped
Yes!! it is!!! It is a Mundorf supreme, and it is by definition a FIXED!! resistor a variable resistor is a potentiometer or rheostat. I did not study the photo until now and I see they do indeed have a clamp on the resistor to change the value this is common practice with these types of resistors.
If you look at the resistor you can see the wire windings through the outer protective coating speaker designers would sand off the coating and use a clamp around the resistor to tap the wire and create the value needed. You can also see in the picture a dimple or depression in the clamp that is the exact contact point. This is also popular with other British speakers manufactures.
So, to answer the question yes this is a Mondorf supreme resistor and yes, it is 100% indeed a fixed resistor that has been modified by the installer to obtain a certain value and it is still by definition a fixed resistor. A variable resistor like a potentiometer you would just turn the knob to increase or decrease resistance. Or on a rheostat resistor you would have to slide the contact on the bar attached to the resistor to change the value making both the potentiometer and rheostat resistor variable.
Do a google image search for a rheostat resistor and you will quickly see were the idea of modifying these types of fixed resistors come from. I hope this clears up any confusion on the subject.
" a Mundorf supreme, and it is by definition a FIXED!! resistor a variable resistor is a potentiometer or rheostat "
in this pic it sure looks like this one
I did a repair on an Acoustat One speaker and they had similar in the crossover and it was VARIABLE by loosening the screw and sliding it along to a desired resistance
Show us the Mundorf please
OMG !!! The resistor in the photo is a FIXED !! resistor that has been modified by sanding off the protective coating to expose the inner windings of the resistor. So, if you have a 10 OHM resistor and you measure from taps on the end's you will measure 10 OHM but if you sand of the protective coating and expose the inner windings you can then tap off those inner windings to obtain a smaller value such as 8 OHM or
5 OHM and so forth and so on.
Earlier in this post I talked about Spender measuring drivers in small batches this is the reason they would modify an existing FIXED resistor. For example, if your resistance is varying from say 7 OHM to 8.5 OHM some batches of drivers may need 7.2 OHM some7.8 some 8.2 you can simply buy a stockpile of 10 OHM FIXED resistors modify them and now you have a variable of vales all based of a FIXED 10 OHM resistor.
Hopefully this is understandable because I honestly don't think I can explain this in any simpler terms. Look at the pictures you will notice I went to asenergi.com the same website you posted your picture from and took screen shots showing a FIXED!! resistor that has been modified by removing some of the protective coating to expose the inner windings so you can tap off the windings to obtain different values.
You can clearly see in the third pic the back side of the green resistor you posted a picture of, and you can clearly see a strip down the side of a FIXED resistor you can enlarge the photo and see the dimple in the banding strap that make contact just like I said previously about the banding strap on the black Mundorf supreme resistor in the Spendor. you can also see the wire winding in both the 25-year-old black and the new white Mondorf FIXED resistors looks like ribs or rings this is what you're sanding off to expose the inner windings so you can tap of them basically modifying a FIXED resistor to be variable key word FIXED Mondorf resistor!
Go back look at that Spendor crossover it uses Mundorf inductors and Mundorf capacitors what do you think the chances are it uses Mundorf resistors I would say 100%. Further proof would be to read any Spendor literature you will quickly see Spendor then I don't know about now always exclusively used all Mundorf products in their crossovers. So, If Spendor themselves say they used all Mundorf crossover components in the Spendor speaker in question coupled with the fact Mundorf has never made a variable resistor then that should prove 100% without any doubt that the resistor in question is indeed a Mundorf supreme FIXED !!! resistor.
I your still in doubt I can e mail Spendor and post their e mail here as further proof.
Here's my 1+1 interface with the variable resistor indicating the HF result of the setting. They were modified by former employee Roy Esposito with a switchable "air mod" that replaces the variable resistor with a fixed value where I usually leave it.
So if you slide the clamp two notches, is that a known amount, or do you have to measure each movement to know change.?
Just be a bit of pain if in crossover for tuning to have to uncouple from rest of crossover, move/mesure/recouple
have no idea how precise the wiper movement is because I've never adjusted it.
I forgot that, it doesn't mean I'm getting old
the contact points are clamped down to a specific point making sure it's consistent
The purpose of the clamp is a puzzle to me. If f fixed why not just use the resistor end tab
it makes it an adjustable resistor by moving the location along the winding that the contact is made.
It seemed like only purpose and the poster was spot on his other knowledge of the pictured crossover,
Also seemed adjustable due to known history of AudioNote of component trimming for driver performance variation.
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
