Re: AR9 speakers from about 1980.

Suppose I could expect, posting at that time, to be jumped on by the
antipodeans.

"Phil Allison" <philallison@xxxxxxxxxx> wrote

>> Crimped high current vehicle wiring is more reliable and has
>> lower and more stable resistance than solder. So I have read and
>> such is my experience.
>
>
> ** Both claims are utterly false.

Not in my experience, nor in theory. But we have different
experiences and perhaps different theories. You have said nothing
later to justify this example of your habit of making simplistic
sweeping statements from a position of limited understanding.

> Crimped spade terminals are highly prone to suffering poor contact
> and failures over time. There are a serious of mechanisms that
> contribute to this - but anyone who sees and repairs lots of
> equipment will attest to the fact.

Fair enough, I bow to your greater experience of repairing cheap
consumer appliances. However, if you mean "faston" connectors then
the main problem is likely to be with the sliding contact rather
than the crimping. Temperature cycling due to poor contact can then
degrade the crimp.

>> Vibration is one consideration, as soldering creates a stress
>> concentration where the solder ends, and the copper work hardens
>> and eventually fractures.
>
>
> ** Same stress concentration where a wire end is crimped into a
> spade lug. The plastic covers that are usual for automotive
> applications ( and thereby provide a measure of strain relief) are
> almost never used for speakers and the like.

Something of a contradiction. Decent crimping includes stress relief
(usually a sock or boot) in the crimping process.

And not true anyway. A good crimp will hold the bunch of strands
compressed in hexagonal close packing. As the bunch exits the
crimped sleeve, it maintains its own stiffness, which then trails
off smoothly, so avoiding stress concentration. Further, that
intermediate soft-packed zone acts as a damper, absorbing energy
like a leaf spring.

Of course all this can go badly wrong if the crimp is not done
properly, or if poor materials (including out-of-spec wire) are
used. Crimping is far more intolerant of botching than soldering.

>> Guitar amp folk probably have an opinion, coz crimped joints seem
>> common there.
>
>
> ** Yep, and a very common cause of failures - soldering the
> joints up is the answer.

Again, your practical knowledge of cheap consumer durables far
outshines mine. Are you sure the crimp is at fault rather than the
contact?

Soldering is not the only answer. You could replace with good
quality crimped connectors. Soldering is much cheaper for you
though.

>> Why didn't AR solder them, I wonder?
>
>
> ** Quick assembly by non skilled labour = CHEAPER !!

Not a safe assumption. I haven't yet seen a description of quite
what connectors Patrick is on about. If they are really cheap then
yes, they would be CHEAPER !!

OTOH, if they are really expensive connectors, they would be MORE
EXPENSIVE !!

cheers, Ian


.

Relevant Pages

  • Re: Rewire Ford Focus
    ... Properly done it's better than any crimp, ... Soldering is better than poor crimping and can be an option if you don't ... needed, yellow for heavy wires), and use a decent pair of crimping pliers. ... Biggest problem with soldering, is getting the wires properly cleaned to get ...
    (uk.rec.cars.maintenance)
  • Re: Piss OFF - Iveson the TURD
    ... >> to be with the sliding contact rather than the crimping. ... >> Of course all this can go badly wrong if the crimp is ... >> far more intolerant of botching than soldering. ... your practical knowledge of cheap consumer ...
    (rec.audio.tubes)
  • Re: What to use as crimp tool?
    ... fixing them were all done with crimpers with ratches. ... that the ratch ensures a good crimp and that was half of the problem. ... crimping it and that was the other half of the problem. ... Soldering a crimp joint makes it weak. ...
    (sci.electronics.design)
  • Re: What to use as crimp tool?
    ... that is corrosion resistant at the point ... I have seen crimp lugs turn green in the environment. ... Soldering solved the problem. ... I put up witht he marginal crimps because nobody can tell me how to ...
    (sci.electronics.design)
  • Re: What to use as crimp tool?
    ... that is corrosion resistant at the point ... I have seen crimp lugs turn green in the environment. ... Soldering solved the problem. ...
    (sci.electronics.design)