Go to Deletraz Fig 10.
*WHITE PAPER* The Sound of Music - How & Why the Speaker Cable Matters
G'DAY
I’ve spent a sizeable amount of the last year putting together this white paper: The Sound of Music and Error in Your Speaker Cables
Yes, I’ve done it for all the naysayers but mainly for all the cable advocates that know how you connect your separates determines the level of accuracy you can part from your system.
I’ve often theorized what is happening but now, here is some proof of what we are indeed hearing in speaker cables caused by the mismatch between the characteristic impedance of the speaker cable and the loudspeaker impedance.
I’ve included the circuit so you can build and test this out for yourselves.
Let the fun begin
Max Townshend
Townshend Audio
Showing 12 responses by townshend-audio
Audio2design is suggesting that transmission line theory does not apply at low frequencies. Well, it does, even at DC. see https://www.youtube.com/watch?v=ozeYaikI11g&t=136s And at 50/60Hz bigtime. Max |
BTW. 1. Has anyone heard a difference between speaker cables? 2. Has anyone heard a difference in the sound on the clip https://youtu.be/v11hmOE1Vcc. 3. I have tried to explain it, but some are not happy. Is it just coincidence that the traces track characteristic impedance quite closely? |
Zoom meeting with Max Townshend here: https://www.youtube.com/channel/UCKruAdjBL1lxmYMZiXe9P2A |
Can audio2design explain the change in responses as shown in Fig 3. and the close correlation with Zo, if it is not a transmission line effect? All conductor pairs have capacitance and inductance so must have a characteristic impedance. There is no frequency component. Read All About Circuits, chapter 14 thoroughly and the two papers associated. There are long transmission lines and short transmission lines. Silversmith cables have Zo between 800 and 1800 ohms, depending upon the spacing. Don't use conditionally stable amplifiers. 10nF is not a difficult load for a competently designed amplifier. The measurements are of the voltage between the two black terminals at either end of the wire. The short circuit has the least voltage drop and is lower and the cables have a greater voltage due to resistance and are higher on the graph and the treble rise is dependant upon Zo. They are not inverted. As I suggest, do the experiment your self before guessing. |
We have measured a phenomenon and have postulated an explanation that has been peer-reviewed by two highly experienced electronic engineers who agree that the conclusions are correct. You obviously disagree, so could you please explain why there is a difference in the error voltage, shown in fig 3, that correlates directly with the characteristic impedance of the cables? |
The only way to get a square wave out is to match the cable impedance to the load impedance. This is a standard way of determining the characteristic impedance of unknown coax cable. The trick was shown to me when I was working on the ill-fated Blue Streak Rocket development at the Weapons Research Establishment in Adelaide in the early 60s. See my videos Geometry Matters on youtube. Max |
The main reason for the test in the first place was to find a simple measurement that quantified the difference between different geometries. The easiest way is to see what the voltage drop was across a single conductor. There is no sleight of hand or skullduggery going on here. I am an engineer and engineers only work with the truth, because everyone can see when your bridge falls down. (doctors bury their mistakes, lawyers suggest better luck next time, accountants can come up with any figures they like). What fascinates me, is the imagination of the trolls who don't want to know. I know there is a difference between cables and the is not down to a slight frequency variation at 20kHz, there is something more going on and I have tried to identify it. Please participate in the Zoom call at 6 PM GMT 5 Dec 2020. Details to follow. |
Square waves have been universally used in audio since the invention of the oscilloscope and the square wave oscillator. It is an essential tool in our industry because it allows you to analyse all audio frequencies at once. As far as accuracy is concerned, some measurements may be out by +/-20%, but that is not the point. Join in the Zoom session 6 PM GMT 5 Dec and I will show you the experiment and you can ask any question you like. |
The process of the scientific method involves making conjectures (hypotheses), deriving predictions from them as logical consequences, and then carrying out experiments or empirical observations based on those predictions.[5][6] A hypothesis is a conjecture, based on knowledge obtained while seeking answers to the question. The hypothesis might be very specific, or it might be broad. Scientists then test hypotheses by conducting experiments or studies.
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Townshend is inviting you to a scheduled Zoom meeting. Time: Dec 5, 2020 18:00 GMT Topic: Townshend cable measurements Demo + Q&A. To demonstrate that characteristic impedance matters in the case of speaker cables. Forum questions regarding voltage and oscilloscope timebase settings will be addressed. The session will have the following format: A brief overview of the paper. Introduction of the test set-up. A live repeat of the experiment. An opportunity to discuss the theory and test practices. To facilitate preparedness, should you have any specific questions, please feel free to pre-submit them to us. This is not a requirement. Open section for ad hoc or any further questions concerning cable testing. Join Zoom Meeting https://zoom.us/j/93569703283?pwd=Q3hHOStzU0dENnArY0lGV2F3ZGJFZz09 Meeting ID: 935 6970 3283 Passcode: JYzH2K The session will be recorded. |