On Feb 22, 4:03*pm, The Natural Philosopher
wrote:
thirty-six wrote:
On Feb 21, 12:53 pm, The Natural Philosopher
wrote:
thirty-six wrote:
On Feb 20, 11:14 am, Martin Brown
wrote:
On 20/02/2012 10:38, Dave Plowman (News) wrote:
In article
,
* * *wrote:
Cheap co-axial wire is
most suitable for remote speaker connects and simple ellipticals or
dual cone ellipticals work well for this.
Co-ax for speakers? You live and learn.
It wouldn't surprise me if some power amplifiers reacted to having coax
wire used to connect to speakers by oscillating wildly. You really want
From which storybook did you find that gem?
Oh its no story. Not a few rather poorly QC'ed or poorly designed amps
will go mad with a capacitor on the output, and coax is a few tens of pF
a foot

There's normally a loudspeaker unit at the end of the wire. *Your
claims are fallacious.

doesn't matter if there is.

The endpoint impedance of the wire at HF/RF is of little impact on its
impedance overall - that's ALL about capacitance and *coax is simply
more capacitative than T & E. something like 50-150 pF/meter.

Twin lead - 300 ohm ribbon cable - is in the 10-20pF/meter range.

I would expect that T & E would fall somewhere between the two.

I see you know the square root of **** all about the design -
inadvertent or otherwise - of RF oscillators. Or power amplifiers.

Bull****ter!


I must have designed 10-20 in my time and probably the thing that took
longest was making sure they were RF stable with anything stuck on the
output.

Irellevant.

By number, about 6-10 components are there to actually ensure this, and
to ensure its safe whatever the bozo user does to the output short of
stuffing live mains into it,

Normal conditions matter to choice of speaker wire not hypothetical no-
functioning conditions.


Capacitors across teh output are just another ting you check for..

Bear in mind that some cheapskate manufacturers will substitute cheaper
or lower spec devices and/or simply 'remove components' until the design
doesn't work. Then put the last one back in..

I saw a lot of that in early far east kit..parts simply missing off the PCB.

Yes, and ...

Some was legitimate - they would use old boards with newer transistors
that didn't need the extra stabilising. Some was not tho. Pure penny
pinching.

Still has nothing to do with choosing speaker wires.







NORMALLY You put an RF choke in series with the speaker in the amp
design itself. Some cheapskates leave it out...