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More cable questions!
On 4 Jan 2004 04:05:10 -0800, (Bob-Stanton)
wrote:
(Stewart Pinkerton) wrote in message
Indeed yes. Now tell us how you optimise a transmission line between
the sub-ohm source impedance of the amplifier, and the wildly varying
multi-ohm load impedance of the speaker. Sheesh, whatta maroon!
I realise your knowledge of available circuit analysis programs is
somewhat limited. It is not my primary intent to put you down, rather
I writing this to inform.
Indeed, I've only been a professional electronics engineer and
precision analogue specialist for about thirty years, so my knowledge
is certainly limited, Not so limited as some others, of course......
Some circuit analysis programs can handle the conditions you started
above.
Not without a good model of the load impedance, they can't!
With them one can model a circuit using either a voltage source
or a 50 Ohm source, at audio and RF frequenies, with the output
results either in S-parameters or in volts (dB). With these programs
one can use mixed audio and RF components, such as a speaker cable
terminated with a one-port or two-port data model. The only limitation
being that if someone wants to have the results in terms of
S-parameters, there must be both a resistive source (typically 50 or
75 Ohms) and a resistive termination.
Hence they are of course not practical for use between audio
components, which have neither.
Your experience is probably limited to programs (such as SPICE) that
can not handle RF circuits, and RF programs that can not handle audio
circuits.
You are of course simply ducking and diving here, in order to avoid
answering the question. Regardless of which tool you use, you *must*
have a good model of the load impedance - which you don't have. Now,
tell us how you optimise a transmission line between the sub-ohm
source impedance of the amplifier, and the wildly varying multi-ohm
load impedance of the speaker.
Sheesh, whatta maroon!
--
Stewart Pinkerton | Music is Art - Audio is Engineering
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