Speaker Asylum

you have a link of a pic of the Mundorf? It's neither fixed nor a rheostat

184.102.104.44

Story

In Reply to: RE: no it's NOT !! posted by seancuster71@gmail.com on September 22, 2024 at 12:06:41

" 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

Follow Ups:

RE: you have a link of a pic of the Mundorf? It's neither fixed nor a rheostat - seancuster71@gmail.com 15:53:20 09/22/24 (0)
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.
Exactly - E-Stat 15:07:57 09/22/24 (3)
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.
- Is this resistor calibrated, each ridge is 5% of total type, or move/ measure - Edp 21:50:23 09/22/24 (2)
  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
  - It's a linear rheostat - E-Stat 05:22:20 09/23/24 (1)
    have no idea how precise the wiper movement is because I've never adjusted it.
    - yea, that's exactly what it's called - Story 06:47:42 09/23/24 (0)
      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

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