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  • #91
    Re: Do Mills resistors REALLY sound different?

    You forgot one: http://www.duelundaudio.com/Resistors.asp
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

    http://www.diy-ny.com/

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    • #92
      Re: Do Mills resistors REALLY sound different?

      MLSSA supports a curve fitting algorithm, where measured components can be tested for correlation against ideal componts. Works for resistors, capacitors, inductors, by measuring impedance across all frequencies, then regressing to a curve fit.

      Its great for finding wonky caps that otherwise measure fine on a cap bridge, and for inductors than have parasitics.

      It's a great tool, it helped find an issue with my Bryston amp and the speaker wire i was using, which led to a change in the amps the output inductor. It was also invaluable to show exacrtly how different speaker cables measure differently, into real loads, with real amplifers.

      Using MLSSA, I've never found any issue with resistors, but I'm runing a 8 ohm 50 watt Dale RH through tonight, after the report that they're inductive. I'll let everyone know what I find.

      Cheers,
      Dave 3

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      • #93
        Re: Do Mills resistors REALLY sound different?

        Does anyone have measurements, or links, showing instantaeous temp rise in resistors?

        The AES contained many a good article on short term temp rises in voice coils. The pro sound and rigourously objective scientists in their employ felt it to be a large enough issue to publish. I see no reason why resistors wouldn't suffer the same, objectively, especially when they can be consuming watts of power, all wasted as heat (as opposed to loudspeakers where only 99% is heat

        These are instantaneous temp rises and not reflected in a noticed temp rise on the surface.

        Comment


        • #94
          Re: Do Mills resistors REALLY sound different?

          Originally posted by Face View Post
          Uhm, those are a stretch, even for me ;) I am, after all, on a budget, too.

          Dave
          "A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

          www.piaudiogroup.com

          http://www.avguide.com/blog/tas-rmaf...w-technologies
          http://positive-feedback.com/Issue47/ramblings.htm
          http://positive-feedback.com/Issue47/uber_buss.htm

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          • #95
            Re: Do Mills resistors REALLY sound different?

            Originally posted by DDF View Post
            Does anyone have measurements, or links, showing instantaeous temp rise in resistors?

            The AES contained many a good article on short term temp rises in voice coils. The pro sound and rigourously objective scientists in their employ felt it to be a large enough issue to publish. I see no reason why resistors wouldn't suffer the same, objectively, especially when they can be consuming watts of power, all wasted as heat (as opposed to loudspeakers where only 99% is heat

            These are instantaneous temp rises and not reflected in a noticed temp rise on the surface.
            I ran across a paper on Johnson noise in resistors with regards to strain gauge accuracy. I can't remember where. I though it was interesting in that strain gauges are usually associated with very low currents and voltages and was somewhat surprised that resistor noise was such a problem. I'll see if I can find a reference.

            Dave
            "A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

            www.piaudiogroup.com

            http://www.avguide.com/blog/tas-rmaf...w-technologies
            http://positive-feedback.com/Issue47/ramblings.htm
            http://positive-feedback.com/Issue47/uber_buss.htm

            Comment


            • #96
              Re: Do Mills resistors REALLY sound different?

              Originally posted by dbe View Post
              I ran across a paper on Johnson noise in resistors with regards to strain gauge accuracy. I can't remember where. I though it was interesting in that strain gauges are usually associated with very low currents and voltages and was somewhat surprised that resistor noise was such a problem. I'll see if I can find a reference.

              Dave
              That didn't take long. Go from here:

              http://www.google.com/search?hl=en&s...gauges&spell=1

              Dave
              "A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

              www.piaudiogroup.com

              http://www.avguide.com/blog/tas-rmaf...w-technologies
              http://positive-feedback.com/Issue47/ramblings.htm
              http://positive-feedback.com/Issue47/uber_buss.htm

              Comment


              • #97
                Re: Do Mills resistors REALLY sound different?

                Originally posted by dbe View Post
                That didn't take long. Go from here:

                http://www.google.com/search?hl=en&s...gauges&spell=1

                Dave
                Which of the links in the search is the one you are refering to?

                Johnson noise in an 8 ohm resistor, at room temp, over a 20kHz bandwidth (unweighted) is 52nV rms. This is 155dB down from 2.83V rms. Is it possible that this is audible; maybe with bionic hearing?

                Louis

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                • #98
                  Re: Do Mills resistors REALLY sound different?

                  Originally posted by Ludo View Post
                  Which of the links in the search is the one you are refering to?

                  Johnson noise in an 8 ohm resistor, at room temp, over a 20kHz bandwidth (unweighted) is 52nV rms. This is 155dB down from 2.83V rms. Is it possible that this is audible; maybe with bionic hearing?

                  Louis
                  Bingo!
                  R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                  Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                  95% of Climate Models Agree: The Observations Must be Wrong
                  "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

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                  • #99
                    Re: Do Mills resistors REALLY sound different?

                    Which of the links in the search is the one you are refering to?

                    *****

                    I just did a basic search in reply to DDF. Reread the reply to him. I read the article a long time ago. I have better things to do than read all of the unrelated references in my search.

                    *****
                    Johnson noise in an 8 ohm resistor, at room temp, over a 20kHz bandwidth (unweighted) is 52nV rms. This is 155dB down from 2.83V rms.

                    *****
                    Wiki is a great resource, isn't it?

                    At what input level? I misused the term Johnson noise to include shot noise. Since the two are interrelated I used the term when referring to transients. I should have used shot noise which is exclusive of the Johnson noise and is comprised of current noise. My bad: a brain fart.

                    *****

                    Is it possible that this is audible; maybe with bionic hearing?

                    *****

                    I'll have to ask my friend, Patti, with the implant. Perhaps she can tell me.

                    Dave
                    "A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

                    www.piaudiogroup.com

                    http://www.avguide.com/blog/tas-rmaf...w-technologies
                    http://positive-feedback.com/Issue47/ramblings.htm
                    http://positive-feedback.com/Issue47/uber_buss.htm

                    Comment


                    • Re: Do Mills resistors REALLY sound different?

                      Originally posted by johnnyrichards View Post
                      well, I was seven years old in the early 80's and I didn't own a CD player until somewhere around 1990 so I missed the whole debate.

                      You guys are all poopyheads and I have no white papers to back that purely subjective conjecture with so please, just accept my sweeping generalization as a fact. I am a maaintenance man with an AAS in electro-mechanical technology and I have listened to thousands of poopyheads and while they all sound different, they are all poopyheads so there.

                      Holy cow, I mean it's like we are debating audio properties of something that at normal listening levels probably doesn't matter. It's like discussing saturation of iron core inductors. At normal volumes and power levels is it really a concern? Do resistors in a circuit really get hot enough to change properties at normal listening levels?

                      I don't know. I got into a debate about wires one night at work with a pair of "audiophiles" who were picking on me for using cheap Dayton interconnects and 12awg zippycord. They used stupid expensive "Transparent" branded stuff. I mentioned that we were running at 99+% repeatability (+/-0.0005mm) on robots using nothing more than Belkin twisted pair cables and grey ribbon cables etc. Oh, and little carbon resistors with a 10% tolerance all over the circuit boards.

                      FWIW...
                      It's always refreshing to hear engineers on the front lines debunk a lot of this nonsense. I remember a few years ago a debate about what low quality Toslink connectors were, and how they could audibly degrade the sound. I just had to laugh to myself. At work I was using $40,000 Fore ATM switches that used Toslink connectors. Any dropped or altered bits in those switches would have been a Real Big Deal, but the designers knew there wouldn't be a problem. So much for the ignorant audiophiles.

                      And yes, anyone who gets sucked into a debate like this is a poopyhead.

                      Comment


                      • Re: Do Mills resistors REALLY sound different?

                        Yes to A&B - Instantaneous transients (micro to milliseconds: hence the burst of noise) through high power compression drivers are often in the thousands of watts while operating at sustained levels of 50 to 100 watts.

                        NO to C - they were all Culver ceramic boats. The company that I was doing the repair for had a huge stock of Culvers - crappy resistors, BTW

                        D - not so much - it's just physics

                        No, I'm not. I find the Mills, Ohmite, North Creek, and Huntington Electric wirewounds to be my choices. Pretty much I stay away from bulk metals in loudspeaker applications.

                        I appreciate that. I wanted more info, too. It didn't exist. Fortunately for me it started a whole bunch of "why and how" experimentation and research on my part. Check out my reply to Dave Ellis above. It is a good place to start.
                        Curt's Speaker Design Works

                        "It is the mark of an educated mind to be able to entertain a thought without accepting it."
                        - Aristotle

                        Comment


                        • Re: Do Mills resistors REALLY sound different?

                          John Anspach wrote:

                          "I just had to laugh to myself. At work I was using $40,000 Fore ATM switches that used Toslink connectors. Any dropped or altered bits in those switches would have been a Real Big Deal, but the designers knew there wouldn't be a problem."

                          Really, do you really think the transmitter receivers were the same in that peice of equipment as one might find in a $329 sony dvd player? Were the Toslink connectors a glass conductor or plastic, what grade of plastic? What type of LED and what was its drive circuitry, using the parts in the switch no doubt would triple the cost of an above average DVD player.

                          Toslink systems in consumer products were measured to have marginal bandwidth to carry a PCM digital signal and to be prone to data loss. Not all toslink systems are built to the same standard. Why did I even have to write that?
                          Yeah I built a couple speakers....

                          Comment


                          • Re: Do Mills resistors REALLY sound different?

                            Originally posted by dbe View Post
                            At what input level? I misused the term Johnson noise to include shot noise. Since the two are interrelated I used the term when referring to transients. I should have used shot noise which is exclusive of the Johnson noise and is comprised of current noise. My bad: a brain fart.


                            Dave
                            http://www.ilorentz.org/beenakkr/mes...ise/noise.html

                            Shot noise in resistors is far lower than in the silicon junctions used to process and amplify the signal.

                            http://books.google.com/books?id=NmD...sult#PPA325,M1

                            Page 324. Shot noise is non existent in resistors with no DC current, the norm in XO circuits, with wire wound being the BEST at reducing shot noise.
                            R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                            Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                            95% of Climate Models Agree: The Observations Must be Wrong
                            "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                            Comment


                            • Re: Do Mills resistors REALLY sound different?

                              Originally posted by dbe View Post
                              Which of the links in the search is the one you are refering to?

                              *****

                              I just did a basic search in reply to DDF. Reread the reply to him. I read the article a long time ago. I have better things to do than read all of the unrelated references in my search.

                              *****
                              Johnson noise in an 8 ohm resistor, at room temp, over a 20kHz bandwidth (unweighted) is 52nV rms. This is 155dB down from 2.83V rms.

                              *****
                              Wiki is a great resource, isn't it?

                              At what input level? I misused the term Johnson noise to include shot noise. Since the two are interrelated I used the term when referring to transients. I should have used shot noise which is exclusive of the Johnson noise and is comprised of current noise. My bad: a brain fart.

                              *****

                              Is it possible that this is audible; maybe with bionic hearing?

                              *****

                              I'll have to ask my friend, Patti, with the implant. Perhaps she can tell me.

                              Dave
                              Maybe I missed it but I didn't see a spec for shot noise in the Mills resistor data sheet? Some of the other resistor manufacturers do provide a current noise spec of xyz uV/V but not Mills. But even if it turned out to be +10dB for one of the low cost Mills alternatives, that's still 110dB down.

                              I am always open to learn new things, but so far I still don't see the Mills making an audible difference in a x-over; unless the low cost alternatives are simply horrendous noise generators.

                              Louis

                              Comment


                              • Re: Do Mills resistors REALLY sound different?

                                Originally posted by Jonathan Anspach View Post
                                It's always refreshing to hear engineers on the front lines debunk a lot of this nonsense. I remember a few years ago a debate about what low quality Toslink connectors were, and how they could audibly degrade the sound. I just had to laugh to myself. At work I was using $40,000 Fore ATM switches that used Toslink connectors. Any dropped or altered bits in those switches would have been a Real Big Deal, but the designers knew there wouldn't be a problem. So much for the ignorant audiophiles.
                                Hi Jonathan,

                                Ever seen this? http://www.amazon.com/Denon-AKDL1-De.../dp/B000I1X6PM

                                Originally posted by DDF View Post
                                Does anyone have measurements, or links, showing instantaeous temp rise in resistors?
                                I'm not quite sure how this would be relevant if there isn't an audibilty study to go along with it.
                                Plus measurements are only relevant to the uninformed crowd if they represent a straw to cling to, that might support a belief. If the measurements fail (as always) to support the belief, then they will be dismissed as insufficient and the old fall back of some yet unknown measured parameter (electro-acoustic) is responsible. Of course fMRI's and anything related to the psychology of acoustics will be completely ignored.
                                The "heard it" (when I see/know/change volume/etc) crowd tales will continue to be told and accepted as gospel by some.

                                Now if they simply said, hey, I know there is no evidence of change in the soundfield when I add/change widget X in my system, but it affects what I hear anyway, I enjoy it, but there is no guarantee it will affect your brain (as opposed to stereo system) in the same way.
                                Well, who could argue with that?

                                cheers,

                                AJ

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