Mr. geoffkait
What is between resistance and conductivity?
Yes, silver is by 5.4% better than cooper. But the cost...Mr. geoffkait,
the cost. Is 94 times higher. You can add 6% to the cross section and save the
cost of silver.
For the rest, as you are not responding to my questions, I'll take the
liberty to do the same.
I'll do answer myself regarding Burn In (BI)
In the military and airborne industry, regarding reliability the
attitude is serious. As so, they came out with MIL-STD-785B, MILITARY STANDARD:
RELIABILITY PROGRAM FOR SYSTEMS AND EQUIPMENT DEVELOPMENT AND PRODUCTION
and MIL-HDBK-217F, MILITARY HANDBOOK:
RELIABILITY PREDICTION OF ELECTRONIC EQUIPMENT.
The theory (I'll save you from reading all of it), is that a LRU (line replaceable
unit) has a life cycle and a life span. Most of its failures accrue during its childhood
and at the end of its days. A BI process (mandatory!) is done on each unit
(100% of all batches), in which the units are entered into a temperature chamber
that has a bottom vibration plate for 10 cycles. Those cycles are calculated as
the MIL STD requires, and their cycle's length and durations are set. By the
end of this BI process, the LRU is over its childhood and starts its failure
free life cycle.
At the same time the BI also surface craftsmanship and components with
poor margins. At an event of a failure, an analysis is conducted and the data
is accumulated. Pattern failures will surface engineering or reliability issues
if any. During the process, the LRU is turned off at extreme cold (-54 Deg. C)
and turned on at -40C. After some time at -40, it will climb to +55 or +70C for
a longer period of time. During all that the LRU is "ON" and runs a
BI test loop.
So how is that relevant to a speaker cable? As the LRU is not performing
any better at the end of the BI process, nether is a cable. BI is not about
performance. It is about reliability.
No one, even in the military and airborne industry ever do reliability
predictions or reliability verification for single wire. Also the MIL STDs
don't require it (it is required only for: SYSTEMS AND EQUIPMENT and ELECTRONIC
EQUIPMENT, as the MIL STD specifies).
The swindler part of the audio industry and sales borrowed this say to
get things working for them. When a guy gets an expensive cable or is
demonstrated with one, to be convinced to buy it, and the impression from
hearing cession, doesn't cut the deal, The BI comes to their help. It will buy
them time to send a full customer home with that item, waist its time (as
really nothing changes in the physical level, it remains the same cooper wire
with the same properties as before the BI), and the deal is sealed. Don't be
full and don't fall into this scheme. Another way to call it, is a full's story
over a bad product. An excellent deal for the sales man, but not a good deal
for you. Never buy the BI story. Don't be full.
