Because so many DIY'ers do not experiment nor listen to sounds (vs music) carefully..... it has long been known by others that just replacing old, oxidized cable with new fresh of same type changes the sound. Thus, the desire to use OFC copper to reduce oxidation rate and to use an air tight bonded dielectric covering the wire. Nor chemical contamination from dielectric extruded on copper surface.
As I said before - the total Ls [including prox] is most important for speaker cable design ..... which cable construction topology for a speaker cable would be best?
🙂
THx-RNMarsh
US9293240B2 - Low inductance electrical transmission cable
- Google Patents
As I said before - the total Ls [including prox] is most important for speaker cable design ..... which cable construction topology for a speaker cable would be best?
🙂
THx-RNMarsh
US9293240B2 - Low inductance electrical transmission cable
- Google Patents
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Yes it is but in the case of a balanced receiver we have considerably more control on making sure return current goes back the right way than single ended? Additionally you can arrange to only connect one end of the screen (or only capacitively couple the remote end). Outside of the transformer guy (Whitlock) not much is written about this. Certainly Hans has got some exceedingly (almost too good) reductions in mains pickup using this approach. I figured it was a can worth kicking around a bit.
Fair enough. Possibly swamped by speaker distortion but, easy enough to test for those that worry about it, or use such cables (not me).
Over to you, those who started this, then! Go measure it and lets see! 🙂
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Id like to spend some time quantifying these effects wrt speaker cables. The physics is clear, but given a good quality cable with an end to end resistance of say 10 mO, what can we expect the cable to measure at 100 kHz - talking here about skin effect and not lumped L and C.
Did you folks look at the cable price list I posted earlier? £5000 for a 1 meter unterminated cable.
Elsewhere on the same website, £115 000 for a 50 metre roll of speaker cable.
Elsewhere on the same website, £115 000 for a 50 metre roll of speaker cable.
He should be. I agree. It sounds great. Good enough to demo really refined speakers with.
-RNM
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I think that I should make some comments about the Parasound JC-1+ just introduced.
First, the inclusion of 'Music Rails' was implemented by me, because of success that our local designers had with the devices inside their amps. There was a great deal of negotiation to get these parts at an affordable price, and finally the patent expired on the MR's and Jack Bybee virtually gave me permission to use the devices.
While the design was kept confidential for many years, now I know it to be an advanced form of cap multiplier, with no real voltage reference, but with a very low output impedance and VERY LOW NOISE (for a regulator).
I found that using these MR's separately following a couple of HP power supplies, I could reduce the noise on the power supplies by 10's of dB's, making it easier to develop separate gain circuits outside a complete design.
Now, will these MR circuits actually do anything useful for the JC-1 power amp? I hope so, but the proof is in the listening, and not enough subjective feedback has come back yet to know for sure. Still, they couldn't hurt.
The JC-1+ is a refinement of the original JC-1, that is almost 20 years old. We needed a replacement, hopefully an improvement, and this is what I set out to do some years ago. I took the original design, cascoded the second stage, and added a number of extra output transistors in parallel to spread out the heat further on the heat sink, and to allow a slightly higher value emitter resistor per device for better protection from shorts, etc. The basic transfer function of the output stage should be about the same as the JC-1, and open loop, should parallel what Bob Cordell showed for output transistors operating with the optimum emitter resistor (in this case, 0.22 ohm) X 12. The smoothest transition between the Class A region and Class B (about 25W into 8 ohms in this case) is all important to me. I don't like to use negative feedback, either local or loop any more than necessary, so my measurements will not be nearly perfect, except at levels below 10W or so. This is my design choice. We shall see how it goes, when compared with similar products.
First, the inclusion of 'Music Rails' was implemented by me, because of success that our local designers had with the devices inside their amps. There was a great deal of negotiation to get these parts at an affordable price, and finally the patent expired on the MR's and Jack Bybee virtually gave me permission to use the devices.
While the design was kept confidential for many years, now I know it to be an advanced form of cap multiplier, with no real voltage reference, but with a very low output impedance and VERY LOW NOISE (for a regulator).
I found that using these MR's separately following a couple of HP power supplies, I could reduce the noise on the power supplies by 10's of dB's, making it easier to develop separate gain circuits outside a complete design.
Now, will these MR circuits actually do anything useful for the JC-1 power amp? I hope so, but the proof is in the listening, and not enough subjective feedback has come back yet to know for sure. Still, they couldn't hurt.
The JC-1+ is a refinement of the original JC-1, that is almost 20 years old. We needed a replacement, hopefully an improvement, and this is what I set out to do some years ago. I took the original design, cascoded the second stage, and added a number of extra output transistors in parallel to spread out the heat further on the heat sink, and to allow a slightly higher value emitter resistor per device for better protection from shorts, etc. The basic transfer function of the output stage should be about the same as the JC-1, and open loop, should parallel what Bob Cordell showed for output transistors operating with the optimum emitter resistor (in this case, 0.22 ohm) X 12. The smoothest transition between the Class A region and Class B (about 25W into 8 ohms in this case) is all important to me. I don't like to use negative feedback, either local or loop any more than necessary, so my measurements will not be nearly perfect, except at levels below 10W or so. This is my design choice. We shall see how it goes, when compared with similar products.
That would be from the US vendor that was dropped and you can see why. The stuff from the Asian vendor was much more corrosion resistant. The corrosion would seriously affect the DCR.
Some numbers and/or actual measurements please. I'm talking strand to strand. So all the wires are firmly soldered together at each end, what makes a potential that forward bases a diode somewhere in the middle?
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