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

gab · « **Reply #1 on:** 3 Oct 2018, 07:10 pm »

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 · « **Reply #2 on:** 3 Oct 2018, 07:26 pm »

desafinado · « **Reply #3 on:** 3 Oct 2018, 07:47 pm »

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 · « **Reply #4 on:** 4 Oct 2018, 05:54 pm »

rollo · « **Reply #5 on:** 4 Oct 2018, 07:34 pm »

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 · « **Reply #6 on:** 5 Oct 2018, 12:50 pm »

johnto · « **Reply #7 on:** 8 Oct 2018, 04:02 pm »

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 · « **Reply #8 on:** 8 Oct 2018, 05:33 pm »

Quote from: johnthano on 8 Oct 2018, 04:02 pm

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 · « **Reply #9 on:** 8 Oct 2018, 06:35 pm »

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 · « **Reply #10 on:** 8 Oct 2018, 06:58 pm »

jaylevine · « **Reply #11 on:** 9 Oct 2018, 09:41 pm »

Quote from: SteveFord on 8 Oct 2018, 06:35 pm

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 · « **Reply #12 on:** 9 Oct 2018, 09:57 pm »

josh358 · « **Reply #13 on:** 10 Oct 2018, 01:12 am »

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 · « **Reply #14 on:** 15 Oct 2018, 07:48 pm »

Elizabeth · « **Reply #15 on:** 17 Oct 2018, 09:29 pm »

Tone Depth · « **Reply #16 on:** 17 Oct 2018, 11:43 pm »

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

Quote from: Elizabeth on 17 Oct 2018, 09:29 pm

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 · « **Reply #17 on:** 18 Oct 2018, 04:45 pm »

Elizabeth · « **Reply #18 on:** 2 Jan 2019, 09:19 pm »

Elizabeth · « **Reply #19 on:** 4 Jan 2019, 06:38 pm »