The RESISTOR thread. The one ohm resistor on Magnepan high or midrange

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Elizabeth

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So I finally caved in and tried a one ohm (supplied by Magnepan) resistor in the mid range slot. HEY! sounds good.
I immediately ordered a pile of Mundorf film resistors 10 watt in various sizes. 0.33  0.68.  1.0  1.5  2.2 ohms from Madisound to give them a try.
Also wondering if Cryo'ing them would do any good?
Anyone else played with alternates to one ohm? or other brands of  high wattage resistors in their Maggies?
Added: new alternate resistors arrived in today's mail. Cleaning them first, just the 0.68, the 1.0 and the 1.5 pairs. First rubbed leads with Meguiars Scratch X. An automotive paint surface cleaner. is great for all sorts of cleaning where a super fine abrasive is wanted., like CDs. DVDs. The Scratch X took off a lot of tarnish. Then treated leads with Caig red cleaner. then Gold. Bent all the leads to the right shape, then placed extras in new small baggies for safekeeping.
Stuck the 0.68 in place of OEM 1.0 ohm for starters. No comment on change in sound other than slightly brighter. The new resistors need to break in.
« Last Edit: 3 Oct 2018, 05:50 pm by Elizabeth »

gab

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There is a pdf link to a HIFICRITIC review that Martin Colloms did listed at the bottom of this page:

http://duelundaudio.com/resistors/

from pdf: "CONCLUSIONS
While it’s true to say that we were using a very high
quality test platform, the differences we heard were
greater than expected and led to clear preferences.
Duelund’s mythic reputation was upheld: its products
really do seem to provide the required attenuation
without significantly disturbing the music quality.
(Close tolerance to order.) While slightly coloured,
Mundorf ’s MResist also justified its reputation, this
high specification component holding musical values
essentially intact thanks to exceptional build quality.
One surprise was the higher ranking of the 5W
Mundorf MOX over their 10W example, but it was
also clear that these two were of different construction,
and both are very good value. The Caddock MP series
film sounded familiar, as it should, and certainly had
hi-fi credentials, but was not the test favourite. Close
tolerance values are available for this precision resistor.
Industry generic ceramic wire-wounds do the job
but are unremarkable, with some added subjective
distortions, while the Welwyn W24 warhorse no
longer figures. Found to be rather self-effacing, Vishay’s
Sfernice oxide film type was quite neutral but musically
rather bland.
"

Elizabeth

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Wow. Thank you gab! great info.

Added I already decided to try the 1.0 Mundorf. Warmer mids fer' sure. (then the 0.68 ohm)
I may want the 5 watt MOX, or the M resist. Duelund are kind of pricey. but if I get the exact ohm down I might try those too.

desafinado

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I have the 1.0 ohm Duelund "cinnamon sticks" in my Tympani custom X-overs now and they provide an increase
in clarity and sweetness compared to the standard Magnepan cement ones. 
Parts Connexion has the 0.75 ohm ones on clearance for a great price. 

https://www.partsconnexion.com/DUELUND-70906.html

Elizabeth

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I would go for the Duelund. BUT.. I am still trying to find the right resistance. What sounds best.
I just now stuck in the 0.33 ohm resistors. Sounds good. Definitely 'brighter' sound than the 0.68
So far I am pretty sure what I want is somewhere between the 0.68 resistor, and this 0.33 set.
I can make a 0.50 resistance using two one ohm in parallel. and even a 0.75 ohm with two 1.5 in parallel.
May be the next experiment.

rollo

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  The size of resistor is system dependent. The higher you go the with resistance the warmer the sound. To date the most effective brand is Duelund in our experience.
  Eliz a suggestion if I may. Using an abrasive cleaner that would scratch the surface may not be prudent. The best connection is with polished connectors. If there are valleys or  voids in contact surface less of a solid connection is had. That is why contact enhancers such as Furutech are made. To fill those voids.
I love to read about your experimenting as that is what I do as well. Have fun trying.

charles


Elizabeth

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Closing in on the optimum value for my setup. Using 0.5 ohms (by adding 2 one ohm in parallel). So I am narrowing it down to between the 0.33 ohm and 0.5 ohms resistance total.
I kind of like using two paired in parallel. seems a little more free sounding.
I could also do a 1.0 ohm with a 0.68 ohm in parallel to get 0.4 ohms..
I think that is the next set of tests.
Added... later in day, Have been playing Lps all day. (weeding) I am pretty satisfied with the sound and ordered Duelund Cast to give me a pair creating 0.5 ohm.
I am going to put them behind the speaker wire connector plate. So then if I want, I can still 'adjust' them adding an additional resistor to the outer spot. 2ohm for 0.4 ohm end result, one ohm for 0.33 end result, and 0.68 for 0.29 end result. also it allows me to just PUT BACK IN the stock jumper and have zero additional ohms. Perfect.
(I could make it really 'complicated and add a switch for the 1.5 ohm of the two. Then I could have 0.75 ohm. or 0.50 ohm at the flick of switch. and still have option of changing the impedance downward (only) by adding the external resistor, or to zero it with the jumper. (I have miniature silver contact switches, just would have to drill a hole in the small plates.)
« Last Edit: 5 Oct 2018, 09:55 pm by Elizabeth »

johnto

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I found that the higher I went with resistors the deader the sound on my 3.7i. All the top end was missing once I got past 1 ohm.

rollo

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I found that the higher I went with resistors the deader the sound on my 3.7i. All the top end was missing once I got past 1 ohm.


  My findings as well. Living on the edge of transparency and presence one can go a bit too far and be left with lean or bright. A fine line for sure. I chased that sound the wrong way and found it was not the speake [ Maggie at the time ]. It was other things. For me it was the SS preamp with SS amp. Changing to a lush sounding preamp [ Wytek 6SN7 based ] and a richer cable from source problem resolved.


charles

SteveFord

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Everybody's ears, room and system is different but I'm in the no resistor camp.
I tried them and they cut off too much of the highs for me but I also have high frequency hearing loss due to one stupid day being trapped next to a Sears air compressor.

Elizabeth

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Yeah, one ohm is definitely too much for me too.
So far with one half ohm, using the Mundorf MOX (two 1 ohm in parallel) the sound if pretty good. I am still waiting on the Duelund resistors.

jaylevine

Everybody's ears, room and system is different but I'm in the no resistor camp.
I tried them and they cut off too much of the highs for me but I also have high frequency hearing loss due to one stupid day being trapped next to a Sears air compressor.

+1

"high frequency hearing loss...." re:  45 years of motorcycle riding....

SteveFord

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josh358

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As everyone says, it's going to depend on how much HF absorption you have in your room. Wendell likes to point out though that the default is *not* no resistor. He compares that to turning a tweeter level control all the way up.

Elizabeth

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Good news is I got the Duelund resistors. The bad news it the 10 watt DO NOT FIT in behind the speaker wire/fuse plate. The cut out hole behind the plate does not have enough room to allow the 10 watt to fit any which way I could imagine. So I ordered another pair of 5 watt with the same impedance as the 10. I am using two on each speaker midrange anyway, so it will still BE 10 watts total.
I just plugged in the 10 watt I have into the rear portal.
The Duelund resistors are nice. A plus (to me anyway) is I have some Teflon 20 gauge wire and that Teflon insulation, stropped off the original wire, FITS the Dueland bare silver leads 100% perfect. The Teflon actually has to be screwed on. (Since the leads are two wires soldered together, tightly twisted) The Teflon screws on just right. IT cannot slip off, too tight!
So I am happy. Sound? no big difference I can tell instantly. Upper mids maybe a little sweeter?
Added: A few more hours on the resistors. Can say greater clarity. Certain vocals are clearer.. attack is slightly better. Sharp edge of notes break cleaner. This is all subtle. Not big WOW stuff. Worth a hundred bucks? yes.
« Last Edit: 15 Oct 2018, 11:58 pm by Elizabeth »

Elizabeth

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Tried just the 0.75 ohm 5 watt Duelund an they seem fine. Seem not enough capacity  just 5 watts.(theoretically) But the Duelund are not even getting a little warm. I am erring on the side of caution though and ordered 6 more. So I can make a 20 watt 0.75 ohm resistor. four in a 2 in series/those pairs in parallel making a 20 watt 0.75 ohm resistor set. Then it will have enough current capability!!!
I have listened to the 0.75 ohm and like it petty much. With those inside, I can adjust LOWER (only... with adding resistance in parallel) than 0.75 with other bits (using the external midrange ports to find the perfect resistance level.
Easy to keep at 0.75, or lower it to 0.65 0.6 0.5 0.4.. anything.. with added single 10 watt Duelund on outside port.Nice too I can just put in the OEM shunt and zero out the resistance to compare, anytime.

Tone Depth

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All of those additional soldered connections don't alter the sound?

Tried just the 0.75 ohm 5 watt Duelund an they seem fine. Seem not enough capacity  just 5 watts.(theoretically) But the Duelund are not even getting a little warm. I am erring on the side of caution though and ordered 6 more. So I can make a 20 watt 0.75 ohm resistor. four in a 2 in series/those pairs in parallel making a 20 watt 0.75 ohm resistor set. Then it will have enough current capability!!!
I have listened to the 0.75 ohm and like it petty much. With those inside, I can adjust LOWER (only... with adding resistance in parallel) than 0.75 with other bits (using the external midrange ports to find the perfect resistance level.
Easy to keep at 0.75, or lower it to 0.65 0.6 0.5 0.4.. anything.. with added single 10 watt Duelund on outside port.Nice too I can just put in the OEM shunt and zero out the resistance to compare, anytime.

Elizabeth

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All of those additional soldered connections don't alter the sound?
Curious thought. With all the hundreds of solder joints in around and throughout the system, I would not give a moments thought to adding ) ONE more. (The original resistor is soldered at each end. TWO. With four resistors, two are soldered together at the same place as one. Two are soldered at the other same place. Then you add ONE junction of the four connected together in the middle, so that is one new solder joint.