Biwiring with Nordost
 

Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:

Do some comparative listening with cable runs of around 10 Metres. You'll
hear a difference very easily.

To return to my earlier question.....

How much inductance do you think is audible ?

**Without nominating the length of the cables and the impedance of the
speakers, it is not possible to say.


I know it's not possible to give a blanket answer but how about in terms
of X dB @ X kHz ?

**Depends on the listener.

So, from your experience would you care to take a stab at a sensible ball-park
figure ?

Graham

Biwiring with Nordost
 

Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:
"Laurence Payne" lpayne1NOSPAM@dslDOTpipexDOTcom wrote
"Trevor Wilson" wrote:

**I'm sure there is. I never bother reading the hyperbole from a
manufacturer's site. I am ONLY interested in the technology and the
numbers. The science and the numbers tells me all I need to know about
how a cable will sound. And trust me: The technology and the numbers
from Nordost products is pretty good.

I particularly liked the emphasis on "90% of the speed of light" etc.

What technology would you say is important in a speaker cable?

**The use of PTFE, the ribbon conductors and the fact that the conductors
can be arranged to provide low inductance.

Why PTFE of all things and why ribbons ( are you thinking skin effect
here ) ?

**PTFE has many advantages as a dielectric material. Chief amongst them (in
this instance) is the ability to allow very thin insulation to be used, thus
allowing the construction of low inductance cables.

In which case they'd be high capacitance too though.


Secondarily, PTFE keeps cables rigid.

How does that help ?

Graham

Biwiring with Nordost
 

Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:

I don't consider that any one technology is important in a speaker cable,
as long as the right numbers are achieved. Those numbers a

* Low resistance.
* Low inductance.
* Conductors which cannot move under the effects of EMF.

Under the effects of EMF ????

**Indeed. Basic electrical theory. Two parallel conductors will move when an
opposing current is passed through them.

Ultra-minutely in the case we're considering but the wires are in any case
restrained by their insulation.

In any case, what's going to be audible about it ?

Graham

Biwiring with Nordost
 

Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:

* Use an amplifier which can deal with 2 Ohm (or better) load impedances,
without Voltage drop or current limiting (no MOSFETs or valves, of
course).

MY mosfet amps will drive 2 ohms no trouble !

**That's what you think.

Do you know anything about them ?

Tell me about your objection to mosfets in this regard.

Graham

Biwiring with Nordost
 

In article , Eeyore
wrote:


Jim Lesurf wrote:

In article , Eeyore
wrote:

Amplifiers love inductance.

Not so. If the load is predominantly inductive then this increases the
power dissipation in the output devices compared with what would be
dissipated with a resistive load of the same magnitude. Also, it can
shift the IV locus into less safe portions of the SOA.

I was referring to typical speaker loads as opposed to solenoids or
motors aor whatever.

Unfortunately for the designers/makers of power amplifiers, various dynamic
speakers can look like quite inductive loads at some frequencies. This
seems particularly the case at low frequencies around resonances. The
result can be subjecting the output devices to IV curves which can take
bipolar devices into parts of their SOA where they can only survive the IV
product for a brief period if secondary breakdown is to be avoided. If this
were not the case, it would be much easier (and cheaper) to build reliable
amplifiers that could drive high voltages and currents into the loads.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

Biwiring with Nordost
 

On Tue, 09 Jan 2007 00:27:27 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
John Phillips wrote:
I may possibly have been able to do that particular calculation mumble
years ago but I regret that parallel multiply coupled transmission lines
is too complex for me now without a lot of re-learning :-(.

Transmission line theory depends on a match at either end.

No it doesn't. Transmission line theory works whatever you have on the
ends.

d

--
Pearce Consulting
http://www.pearce.uk.com

--
Posted via a free Usenet account from http://www.teranews.com

Biwiring with Nordost
 

In article , Dave Plowman (News)
wrote:
In article , John Phillips
wrote:
I may possibly have been able to do that particular calculation
mumble years ago but I regret that parallel multiply coupled
transmission lines is too complex for me now without a lot of
re-learning :-(.

Transmission line theory depends on a match at either end.

But that won't alter the actual C/L/R/G values per metre for the cable.

....assuming, of course, that you aren't worried about higher order modes.
:-)

I would dearly love the magazines to routinely *measure* the C/L/R/G values
and publish the results as it would save the rest of us a lot of bother.
(OK, I can forgive them for not measuring G. 8-] But measurements of
C/L/R are trivial for this kind of situation.)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

Biwiring with Nordost
 

"Eeyore" wrote in message
...


Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:

* Use an amplifier which can deal with 2 Ohm (or better) load
impedances,
without Voltage drop or current limiting (no MOSFETs or valves, of
course).

MY mosfet amps will drive 2 ohms no trouble !

**That's what you think.

Do you know anything about them ?

**About the ones you use? Nothing.


Tell me about your objection to mosfets in this regard.

**I've never heard ANY MOSFET amp drive Quads adequately. Yours may well be
different.


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com

Biwiring with Nordost
 

"Eeyore" wrote in message
...


Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:

Do some comparative listening with cable runs of around 10 Metres.
You'll
hear a difference very easily.

To return to my earlier question.....

How much inductance do you think is audible ?

**Without nominating the length of the cables and the impedance of the
speakers, it is not possible to say.


I know it's not possible to give a blanket answer but how about in
terms
of X dB @ X kHz ?

**Depends on the listener.

So, from your experience would you care to take a stab at a sensible
ball-park
figure ?

**Depends on the listener.


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com

Biwiring with Nordost
 

"Eeyore" wrote in message
...


Trevor Wilson wrote:

"Eeyore" wrote in message
Trevor Wilson wrote:
"Laurence Payne" lpayne1NOSPAM@dslDOTpipexDOTcom wrote
"Trevor Wilson" wrote:

**I'm sure there is. I never bother reading the hyperbole from a
manufacturer's site. I am ONLY interested in the technology and the
numbers. The science and the numbers tells me all I need to know
about
how a cable will sound. And trust me: The technology and the numbers
from Nordost products is pretty good.

I particularly liked the emphasis on "90% of the speed of light"
etc.

What technology would you say is important in a speaker cable?

**The use of PTFE, the ribbon conductors and the fact that the
conductors
can be arranged to provide low inductance.

Why PTFE of all things and why ribbons ( are you thinking skin effect
here ) ?

**PTFE has many advantages as a dielectric material. Chief amongst them
(in
this instance) is the ability to allow very thin insulation to be used,
thus
allowing the construction of low inductance cables.

In which case they'd be high capacitance too though.

**Irrelevant. Decantly designed amps will cope with highly capacitive loads.



Secondarily, PTFE keeps cables rigid.

How does that help ?

**To reduce movement of wires under EMF effects, due to the proximity of the
conductors and the currents flowing. Which, in turn, ensures that the cable
characteristics do not change, depending on current flow.


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com