Click title to read one, or click date to read all below it.
12-02-02
I don't understand much about electricity or why "bette ... Ncarv
12-02-02
Checkmate110, i don't understand how they work, but they do. ... Jmcgrogan2
12-02-02
If you have about a year of extra time, read through all the ... Mattybumpkin
12-02-02
I agree, after market power cords have made a great improvem ... Blueswan
12-02-02
Ncarv, i love the analogy you made to water/filtered water! ... Lak
12-02-02
Former pc skeptic a few months ago i bought a pair of vtl 3 ... Vegasears
12-02-02
A look at the archive will turn up the following two things: ... Judit
12-02-02
I just recently ventured into the after market pc arena. the ... Gooddomino
12-03-02
First off,thanks for all your responses. you have provided a ... Checkmate110
12-03-02
Not snake oil. too many folks say otherwise. in my case ther ... Sonic_genius
12-03-02
It's nice to see a new set of faces on the power cord issue ... Jadem6
12-03-02
Junking the 18 ga cables that come in the box for 10-12ga sh ... Socrates
12-03-02
People who argue against the sonic benefits of powercords ei ... Swklein
12-03-02
Pure note sigma: i use to think all this talk about power c ... Drrdiamond
12-03-02
I personally use cheap cardas power cords ($79) only for mec ... Ak1999
12-03-02
My advise, try it before buying it. most systems will get a ... Hepl
12-03-02: Audioengr
Amplifiers demand current from the power-line when the capacitors in their power-supplies become momentarily discharged due to high-current transients in the music signal. This discharge condition must be quickly recharged from the power-line, through the power-supply transformer, or a voltage sag will occur. Such voltage sags can cause audible distortion at the loudspeakers. If the power-line has significant series inductance in the path from the power panel to the amplifier, this can prevent the capacitor bank from recharging in time to prevent a voltage sag from occurring at the amplifier output transistors. With a low-inductance cable, the voltage drop across the cable will be insignificant during high-current transients, minimizing the voltage sag. This allows all of the current needed by the output transistors to be supplied when they need it, resulting in fast, dynamic response to transient signals.
What is important to understand is that typical rubber cords have many times the inductance of the ROMEX in the wall, so adding a rubber power cord is like extending the ROMEX from 20 feet to 30-40 feet. Here is a calculation based on actual measurements:
A typical 6-foot 14 AWG rubber cord and 25 feet of ROMEX has inductance of 7.2 uH and resistance of 235 mohms, ignoring the plug resistance effect. Therefore, the voltage drop at 20kHz will be I*(wL+R)= I*(.905+.235) = I*(1.14). With a 6-foot Magnum2 and 25 feet of ROMEX, the inductance is 5.9 uH and the total resistance is 147 mohms. This is an 18% reduction in inductance and a 37% reduction in resistance. The voltage drop for this combination will be I(wL+R) = I(.741+.147) = I(.888). So at a fixed dynamic current I, the voltage drop in the entire power feed at 20kHz is 22% smaller with a Magnum2 power cord. I would consider 22% to be significant. The reality is even more compelling. When you add in lower plug and receptacle resistance and the fact that the di/dt on the power cord will have spectra well above 20kHz with some amplifiers, the low-inductance cord makes an even bigger difference.
Audioengr (Threads | Answers | This Thread)
12-03-02
Once i was reading about a modification to the crossovers in ... Melo
12-03-02
Swklein, at the risk of sounding contrary, scientists do kno ... Fpeel
12-03-02
I am a building inspector and my primary responsibility is t ... Vegasears
12-04-02
Recently i was talking with the designer/president of a pres ... Bob_bundus
12-04-02
Audioengr, if i read your post correctly, the same results w ... Checkmate110
12-04-02
I am the 'other' collegue to checkmate110. i am intrigued to ... M_cassar
12-04-02
Since this seems to be as much a quest for questions as it i ... Fpeel
12-04-02
I have read so many posts that start with the "why" ... Redkiwi
12-04-02
Redkiwi, why ask why, you ask. as a musician/serious amature ... Checkmate110
12-04-02
But my point is that the "why" you might receive m ... Redkiwi
12-04-02
Redkiwi, no, when i ask you "why" i am not saying ... Checkmate110
12-05-02
Checkmate110 - you are correct, the total inductance from th ... Audioengr
12-05-02
M_cassar - there is one other possible benefit of a power ca ... Audioengr
12-05-02
Oy mate, my point is simple - i do not know "why" ... Redkiwi
12-06-02
I'm an engineer but my emag and circuit theory is way too ru ... Dave_l
12-06-02
I'm trying to understand. if the expensive cords don't help, ... Elmuncy
12-06-02
If 18 gauge cable floats your boat then use it. as for me, ... Judit
12-07-02
Elmuncy, some manufacturers go to the trouble of buying nice ... Subaruguru
12-07-02
For the record, i've made power cords for most of my compone ... Elmuncy
12-07-02
Nothing wrong with that, but clean copper in pure teflon wil ... Subaruguru
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