Wires/leads in electronic terminology - Page 1
Forum section: electronics / beginners

author: conductivity
author_rank: Contributor
timestamp: June 16, 2022, 05:32:31 pm
content: So I talked about speaker cables in this thread that was about what specs matter:https://audiosciencereview.com/forum/index.php?threads/best-speaker-cable-specs.32719/post-1216044I wrote that wires are not electronics, they are just a physical material that doesn't add distortion to audio. Please confirm or deny that I am right that cables are not electronics and don't distort an electrical signal if you'd like. Wikipedia lists electrical cables here:https://en.wikipedia.org/wiki/Electronic_component#Cable_assembliesEdit: I have now updated the post on the ASR Forum. Cables are electronic components, since they are components and they are used in electronic circuits.

author: Romualds
author_rank: Contributor
timestamp: June 16, 2022, 05:50:56 pm
content: Shortly -- you are right and wired does not add distortion to audio.However a lot of hi-fi enthusiasts believe that sound is different with different kind of wires and even more -- listening experience changes depending onif wires are heated up (with special kind of sound patterns). There aren't any technical proofs of that -- it's just a matter of believing.UPD: Wires with very bad quality actually can make sound worse -- thin wires to speakers can reduce sound volume and badly shielded wires can catch external interference.

author: Benta
author_rank: Super Contributor
timestamp: June 16, 2022, 06:32:20 pm
content: That cables don't introduce non-linear distortion (harmonics, intermodulation) is true.But they certainly have "electronic" characteristics that are important for signal integrity:Resistance.Capacitance.Inductance.Impedance.Cross-talk.Isolator loss.Plus a couple more.These all contribute to frequency dependent linear signal distortion, eg, bandwidth, rise time, impulse response, overshoot, delay etc.A very instructive study is stripping CAT-6 UTP network cables. You'll see that the twisted pairs have different twist pitch to even out cross-talk between pairs.

author: fordem
author_rank: Regular Contributor
timestamp: June 16, 2022, 06:35:58 pm
content: So - would you consider speaker leads to be a "transmission line"? Try researching transmission lines at audio frequencies and you'll discover the answer is yes, and if the lines are long enough (which is rare for speaker leads) they do make a difference to frequency response.Wires have resistance, pairs of wires have capacitance, combine them together and you have an RC filter, pass an "alternating current" through that RC filter, it's going to alter the signal.Incidentally, there was a point in my life when I was a "disbeliever", and then I discovered "litz wire phono cartridge connectors" (I guess I'm showing my age here) - for those not familiar with what I'm talking about, four inch-and-a-half long scraps of insulated wire with gold plated clips that connect the phono cartridge on a turntable to the wiring in the arm - the difference IS audible, whether or not you consider it an improvement is up to you, but it is audible. To be honest, at this point we're discussing "millivolt" level signals so it probably doesn't take much added resistance to make a differenceWhen an inch-and-a-half snippet of wire can make an audible difference, it's not hard to believe that twenty/thirty/forty/ninety feet of wire will also make an audible difference.

author: conductivity
author_rank: Contributor
timestamp: June 16, 2022, 07:48:02 pm
content: Quote from: fordem on June 16, 2022, 06:35:58 pmSpeaker cables are not transmission lines in practice, only in theory. Power cables use 50 and 60 Hz, which I can hear. Power cables are transmission lines for audio in practice. The longest power line in the world is apparently about 2,500 km long, and the electrical wavelength of 60 Hz is about 5,000 km in vacuum."An interconnect is considered a transmission line when its length is at least one-fourth of the signal wavelength."https://www.allaboutcircuits.com/textbook/radio-frequency-analysis-design/real-life-rf-signals/what-is-a-transmission-line/All of this is of course different from real speaker cables. With regard to litz wire for the tonearm, it will maybe increase parasitic capacitance and that is definitely bad if you used a moving magnet cartridge. I don't know how big the electromagnetic fields are for a few millivolts at audio frequencies (does someone know?). Measurements determine much more than what sounded good, because people fool themselves often about what sounds good. There is a good amount of time spent on talking about audiophoolery in the thread I linked to, on ASR in general and on EEVblog. I believe that litz wire for the tonearm is audiophoolery, but it could have decreased the electrical resistance simply by having more copper than the previous wires that were used.And whenever someone writes an audio product sounded better than another, it is based on faith if people believe in that. Proof comes from when someone verifies the assertion independently. It is entirely possible to connect the phono stage to a low-distortion audio interface instead of a power amplifier, and then make very accurate measurements of a turntable.

author: Benta
author_rank: Super Contributor
timestamp: June 16, 2022, 08:14:59 pm
content: I agree that for audio frequencies, cable infuence is negligible.Concerning the Litz wire for turntables: I can believe that they provide a better result. But for a completely different reason: they don't have an outer isolation sleeve and are thus much more pliable/flexible. This reduces mechanical load on the tone arm and pickup/needle.

author: TimFox
author_rank: Super Contributor
timestamp: June 16, 2022, 08:23:00 pm
content: Any pair of wires forms a transmission line, but uncontrolled construction results in a crappy transmission line with ill-defined characteristic impedance, etc.That being said, for the typical lengths of cabling required in audio installations, the lumped parameters (especially resistance and capacitance per unit length) are far more important than transmission line effects such as reflections.When I installed my speakers on the other side of the living room from the amplifiers, I used 2xAWG12 SO flexible cable. When I bought 50 feet of it at my neighborhood hardware store, the young clerk asked me what I was using it for, and when I answered, he replied "Where are your speakers? Schaumburg?"

author: free_electron
author_rank: Super Contributor
timestamp: June 16, 2022, 08:38:57 pm
content: best speaker cable is a two stacked 40 wire flatcables with all its wires shorted.

author: TimFox
author_rank: Super Contributor
timestamp: June 16, 2022, 08:48:54 pm
content: Quote from: free_electron on June 16, 2022, 08:38:57 pmAn alternative is to connect the odds and evens in the flat cable together. This can help reduce inductance as well as resistance, and fit nicely under the carpet.

author: Benta
author_rank: Super Contributor
timestamp: June 16, 2022, 09:19:30 pm
content: Quote from: TimFox on June 16, 2022, 08:23:00 pmWitty young man. He'll get far!

author: TimFox
author_rank: Super Contributor
timestamp: June 16, 2022, 09:24:12 pm
content: Quote from: Benta on June 16, 2022, 08:14:59 pmThe mechanical reason why flexibility of these wires is important is that they pass through the pivot point for the tonearm to rotate across the disc, and if they be too stiff, the torque puts a transverse force against the needle-groove interface.Since Litz wires do not need a sleeve (or "serve"), they can be more flexible than an insulated stranded wire. It is a nuisance to terminate them, though.

author: conductivity
author_rank: Contributor
timestamp: June 16, 2022, 09:38:18 pm
content: Quote from: Benta on June 16, 2022, 08:14:59 pmGreat idea. Never thought about that the old PVC cables in tonearms can become so stiff that the tonearm might not work right anymore. PVC becomes stiff when plasticizers are lost over time, so silicone insulation is much better for the tonearm if the flexibility must be maintained.Quote from: TimFox on June 16, 2022, 08:23:00 pmOkay, you made me find out that a transmission line is called short when it is up to 80 km, medium from 80 to 240 km, and long when 240 km or longer. But it is normal too that "transmission line" implies "long transmission line".Quote from: free_electron on June 16, 2022, 08:38:57 pmOnly if you absolutely need to hide them under a carpet or something else that is flat, because there is no other benefit from the work that is involved.

author: TimFox
author_rank: Super Contributor
timestamp: June 16, 2022, 09:44:41 pm
content: Quote from: TimFox on June 16, 2022, 08:23:00 pmOkay, you made me find out that a transmission line is called short when it is up to 80 km, medium from 80 to 240 km, and long when 240 km or longer. But it is normal to that "transmission line" implies "long transmission line".By the way, the distance from my house in Chicago to Schaumburg is 35 km, so the speaker cables are short.

author: conductivity
author_rank: Contributor
timestamp: June 16, 2022, 09:53:00 pm
content: Skin effect, inductance, capacitance and resistance are then all transmission line effects for normal audio cables, because none of those parameters can affect the lengths that are used (except MM cartridges, but they are not really hi-fi anyway). Litz wire is for radio frequencies that have skin effect, so not for audio. There are sadly some speaker cables that are made of litz wire, and they add parasitic capacitance that could be a problem in some scenarios (that is not a normal audio cable by the way).Do you think that cables should be called electronics/electronic components, or is that only something designed to affect the signal like when a resistor is added specifically to add resistance on purpose?

author: TimFox
author_rank: Super Contributor
timestamp: June 16, 2022, 10:21:18 pm
content: Quote from: conductivity on June 16, 2022, 09:53:00 pmIf I twist two Litz wires (with some serve) together to make a two-conductor cable, how is the parasitic capacitance greater than with two insulated non-Litz stranded wires of the same spacing between wires?At 10 kHz, the skin depth in copper is 0.65 mm = 0.026 in, so it might be important for a copper wire 0.05 in = AWG 16 = 1.3 mm OD, or larger. My speaker cables discussed above are AWG 12, but the total DC resistance (< 0.1 ohms) is negligible compared with the DC resistance of the voice coil (roughly 6 ohms).There are good MM cartridges, and the flexibility of Litz wire is important for the tone arm, not the cartridge. Note that MM cartridges are higher impedance and higher output than MC cartridges, so the circuit parameters and SNR considerations are different.

author: Benta
author_rank: Super Contributor
timestamp: June 16, 2022, 10:44:03 pm
content: Quote from: conductivity on June 16, 2022, 09:38:18 pmI actually didn't mean "old" PVC here, but simply that the insulation sleeve has an influence on tone arm movement. Whether it's PVC or silicone doesn't really matter. the point is that loosely braided Litz has almost no mechanical resistance to twisting.With really high-end tone arms riding on air- or magnetic bearings, this is the last part of the equation to "free needle tracking".

author: conductivity
author_rank: Contributor
timestamp: June 16, 2022, 10:50:58 pm
content: Quote from: TimFox on June 16, 2022, 10:21:18 pmInsulation of litz wire adds weight to the tonearm. It is the type and amount of insulation that is important for tonearms. So silicone cables with just one layer of insulation each is good, and what I meant was that there is no reason to use litz wire for each channel of a cartridge.This is the kind of sad speaker cable I was thinking about, if you'll please note the capacitance. They even went so far as to use microfarad or millifarad in order to make the number look smaller (in any case, it's way more capacitance than a normal speaker cable). No reason for this cable's existenceArtistCloner SOLITZ speaker cable:"49 strands of LITZ wire (solid core >99.99% high purity annealed copper)"One Solid core *6N-OCC 99.9999% pure copper in a Teflon tubing (Teflon is considered the holy grail in isolation properties)"Very low skin effect losses"Capacitance is less than 0.002mF at 1kHz"Inductance too low to measure"https://www.artistcloner.com/speaker-cables.html

author: TimFox
author_rank: Super Contributor
timestamp: June 16, 2022, 11:08:35 pm
content: Quote from: conductivity on June 16, 2022, 10:50:58 pm

author: Benta
author_rank: Super Contributor
timestamp: June 16, 2022, 11:10:45 pm
content: I don't think you've quite understood the function of Litz cable.That some speaker cable seller hasn't understood it either is obvious.Litz cable is just stranded cable where the strands are isolated from each other. But they carry the same signals and voltage. There's no interaction between the strands at all. Capacitance cannot come into play here. That's an RF thing.I introduced Litz cable here for mechanical reasons only.

author: conductivity
author_rank: Contributor
timestamp: June 16, 2022, 11:48:05 pm
content: Quote from: TimFox on June 16, 2022, 10:21:18 pmConductors separated by insulation is a capacitor. A capacitor has capacitance. Litz wire has more insulation in between conductors in speaker cables and therefore has more capacitance.Quote from: TimFox on June 16, 2022, 11:08:35 pmI guess this doesn't matter either way in practice.So I will rephrase my previous question, does nobody know whether cables are electronic components?

author: BrokenYugo
author_rank: Super Contributor
timestamp: June 17, 2022, 12:53:58 am
content: That's a rather open ended question, it depends how detailed you want/need to analyze things. The practical everyday answer is "no", they're just wires that may as well be running at DC.At audio frequency and typical loudspeaker impedance, any parasitic/stray properties of a speaker cable can generally be ignored AFAIK. There simply isn't enough capacitance or inductance there to color the sound at any perceivable level. Enough copper to handle the current and good low resistance connections are all that practically matter.

author: Kyle_from_somewhere
author_rank: Regular Contributor
timestamp: June 17, 2022, 01:53:02 am
content: Quote from: conductivity on June 16, 2022, 11:48:05 pmYes but they're reactive ones, and the frequency needed to get them to react is far, far beyond what audio has to offer, so it doesn't matter.A better question is: Why are you invested in winning an audiophile argument to the degree you registered to another forum for backup?

author: conductivity
author_rank: Contributor
timestamp: June 17, 2022, 04:07:02 am
content: Quote from: Kyle_from_somewhere on June 17, 2022, 01:53:02 amNo, because the question is wrong. I wanted to challenge my understanding by finding out whether my post on the ASR Forum was correct. I registered this account some time ago, long before I even considered creating this thread.

author: boB
author_rank: Frequent Contributor
timestamp: June 17, 2022, 04:47:21 am
content: Most "Litz" wire you get these days are various forms of twisted wire and not the real woven Litz"Type 8" I believe is the real Litz wire. Or was it type 7 or 9 ?

author: free_electron
author_rank: Super Contributor
timestamp: June 17, 2022, 06:14:21 am
content: Quote from: TimFox on June 16, 2022, 08:48:54 pmthat's another option, yes. Bob pease did an experiment on that.

author: conductivity
author_rank: Contributor
timestamp: June 17, 2022, 06:13:19 pm
content: Quote from: boB on June 17, 2022, 04:47:21 amThere are different types. The gauge is kept low enough to prevent skin effect.The electrical wavelength of 20 kHz is about 14.4 km. Transmission line effects are not a thing with hi-fi cables. I'm not having any litz wire for tonearms or any other transmission line that is for audio frequencies. Any turntable that can't handle about 34 AWG silicone tonearm cables is trash.I was finally able to determine that cables are only electronic components if they are a part of an electronic circuit. They are called electrical components if they are a part of an electrical circuit. A component is a part. Electronic and electrical are adjectives that describe the use. 20/20 hindsight so to speak. The cables are used as interconnects between components that do alter electrical signals, but audio cables don't alter the signal. So they are not like the other components.

author: TimFox
author_rank: Super Contributor
timestamp: June 17, 2022, 06:32:03 pm
content: Litz wire is useful below, say 2 MHz, for applications where the AC resistance is important.In my experience, the capacitance between strands within a given Litz wire results in little use above, say, 5 MHz.I had some interesting uses for 1200-strand AWG 50 Litz wire (unfortunately, not the woven kind) in low-MHz applications.One practical use for larger Litz wire is in winding transformers for high-power high-frequency switching power supplies.As I stated above, since Litz wire is self-insulated with very thin enamel, it may be preferable for tone-arm applications: silicone insulation is flexible, but much thicker than the enamel.The dictionary definition of "component"--"Noun: a constituent part : ingredient" There is no mention of restricting its use to strong effects.

author: conductivity
author_rank: Contributor
timestamp: June 17, 2022, 08:15:15 pm
content: Quote from: TimFox on June 17, 2022, 06:32:03 pmThanks. The analysis only works when the words are broken down to individual definitions. I understand this now and have updated my previous post.

author: conductivity
author_rank: Contributor
timestamp: June 18, 2022, 06:06:24 pm
content: Quote from: TimFox on June 17, 2022, 06:32:03 pmCan you explain more about why you write litz is important for AC resistance?The tonearm wires are color coded according to the audio channels, but the enamel isn't. Litz wire is also twisted together, which mean it would be worse than about 34 AWG copper wire that is used for tonearms, each individually insulated with silicone rubber. There are some "wire wrap" silicone rubber cables.

author: TimFox
author_rank: Super Contributor
timestamp: June 18, 2022, 06:40:15 pm
content: Quote from: conductivity on June 18, 2022, 06:06:24 pmAs I wrote, Litz wire is often used for applications where the high-frequency resistance (which is increased by skin effect at high frequencies) is important. Mostly, that is for inductors and transformers, such as 455 kHz IF transformers.If I were to use Litz wire for a tonearm application, I would use four pieces of Litz wire (or cable, if you will) of an appropriate (small diameter) size, terminated at each end in a suitable lug or clip, and color-code them with a drop of paint on the metal connector. Since each Litz wire is insulated along its length by the enamel, it is not necessary to add insulation there.My reference for Litz wire is the classic F E Terman "Radio Engineers' Handbook", McGraw-Hill 1943, pp 74 ff for discussion of coil losses, and p 37 for the AC resistance of the wire itself.(On the topic of coil construction, the 1943 edition is better than some of the later editions.)

author: Benta
author_rank: Super Contributor
timestamp: June 18, 2022, 07:30:44 pm
content: Quote from: conductivity on June 18, 2022, 06:06:24 pmNo. The Litz wire I mentioned for tone arms is loosely braided and extremely supple.Colour coding using paint dots or coloured shrink tubing on the lugs works well.

author: wizard69
author_rank: Super Contributor
timestamp: June 19, 2022, 03:53:53 am
content: Area carrying electricity are electrical components. More so because the wires are rather exposed you need to be aware of safety issues. So you need to make sure the wires don’t fail due to sizing issues. No granted most amps don’t push enough current but high power amps use to be common in audiophile circles. So always. consider safety from the electrical stand point even if 1000 watt amps are no longer a thing.Beyond all of that I’ve seen more issues with connections impacting performance than anything else. If your connections are not tight and right the wire doesn’t matter.

author: boB
author_rank: Frequent Contributor
timestamp: June 19, 2022, 07:37:59 am
content: Just for reference, here is a list of types of Litz wirehttps://www.newenglandwire.com/product/litz-wire-types-and-constructions/

author: conductivity
author_rank: Contributor
timestamp: August 30, 2022, 09:24:41 am
content: Quote from: TimFox on June 16, 2022, 08:23:00 pmI don't think that any pair of wires forms a transmission line anymore. A pair of wires must exhibit transmission line effects, in order to be a transmission line. See for example this source:

author: Vovk_Z
author_rank: Super Contributor
timestamp: August 30, 2022, 10:24:36 am
content: Quote from: Romualds on June 16, 2022, 05:50:56 pmIt depends. If we won't take into account thermal-electric effects (TCR of a copper wire) then yes, it doesn't add. But in a real life with a acoustic systems currents make wires heat a bit, so we can definitely measure a much larger THD at acoustic system terminals then it was at amplifier output. This effect can be easily observed at low audio frequencies.Wires made from any ferromagnetic material or ferromagnetic terminals distort too. This effect can be found possibly at the whole audio range.So, in general, I don't agree that we should not take wires into account.