yes
-----Original Message-----
From: Matthew Trend [mailto:[log in to unmask]]
Sent: 09 September 2003 02:24 PM
To: [log in to unmask]
Subject: Re: [LF] resistance of solder joints
Just for the next time I buy speaker cable, does it come marked with the
intended direction?
Matt ?:-)
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: 09 September 2003 13:59
To: [log in to unmask]
Subject: Re: [LF] resistance of solder joints
Kay
Especially if it were monocrystalline silver :-)
Brian
Kay Nimmo wrote:
> I expect there could well be anisotrophy in the wire caused by
> extrusion/drawing direction. Directional processing would produce a
> certain directional crystallographic texture in the microstructure. No
> doubt this would affect mechanical properties although I don't know
> about electrical properties...?
> Kay
>
> -----Original Message-----
> From: Matthew Trend [mailto:[log in to unmask]]
> Sent: 09 September 2003 11:40
> To: [log in to unmask]
> Subject: Re: [LF] resistance of solder joints
>
>
> Just to correct you Brian, I think Thomi was talking about having the
> wires the wrong way round. eg. a stereo end and a speaker end, which is
> (as far as I know) a load of rubbish. The guy in the shop must have been
> trying to be superior to the customer, which I have experienced a number
> of times with music 'techies' at audio equipment shops and music shops
> alike. Speaker cables surely can't be directional. But you're right
> about the fact that you can have the speakers 'out of phase', eg. having
> one speaker connected +to+ and -to- and the other speaker
> +to- and -to+.
>
> Please correct me if I am wrong as I am young and am only trying to
> learn. It is an interesting debate though, isn't it. Regards Matt
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]]On Behalf Of Brian Ellis
> Sent: 09 September 2003 11:19
> To: [log in to unmask]
> Subject: Re: [LF] resistance of solder joints
>
>
> Thomi
>
> See below
>
> Thomi wrote:
>
>>To my perception, there was a misprint in the headline, which I could
>>not leave unchanged. It could have been "odd solder joints", however.
>
>
> Odd though it may seem, of was intended!
>
>
>>Audio is a field where religion is not far away. Honestly, when I
>>asked for technical advice about the kind of wire I should use in my
>>new surround sound living room, the guy in the shop told me I should
>>not only use twice as much copper thinckness than I had anticipated,
>>but he seriously told me there was a positive and a negative end to
>>the wire, and he would be able to hear the difference if I installed
>>the wire the wrong way round. I said I might condition the wire by
>>stroking it in one way so as to knead the electrons in a streamline
>>fashion...
>
>
> The guy in the shop was right. For example, in a two or more loudspeaker
> stereo system, if you do not connect all the loudspeakers in the same
> phase, you will hear a diminution of bass sounds. Therefore, reversing
> the wires of one LS is audible. The thickness of copper is also
> important, but it depends on the length of the run. Modern LS have a
> dynamic impedance of 3 to 5 ohms (in the past, they were 15 ohms, so
> made life a lot easier, but low-Z LSs make amplifier design cheaper). If
> your wire length is such that each conductor is 0.5 ohms, then you will
> be losing 1/4 of your output power at 3 ohm frequencies. This can cause
> an apparent non-linearity of the frequency resposns, also audible. If
> your cable run is over, say, five metres, I would be inclined to agree
> with your guru. For short runs, it doesn't matter, ordinary telephone
> wire would do! I use a 2 mm2 rigid mains wire on a 7 m run, but I do
> have 15 ohm speakers.
>
> Some of the myths do have a factual base! Sorry!
>
>
>>I also had a heighbor once who told me he could use his razor blade
>>more than three times as long, it would stay sharp longer by keeping
>>it under a copper pyramid.
>
>
> But only if the whole cutting edge is at a single exact point in
> three-dimensional space :-) It is amazing how some people are gullible.
> Just consider all the attrape-nigauds (sorry can't express that in
> English) targeting motorists to improve the performance of cars.
>
>
>>Now, two things for you, Joe:
>>
>>First, I think this kind of "knowledge" (including the provable
>>proportionality of price and perceived quality) is just showing us how
>
>
>>much worth a good marketing is.
>
>
> Agreed!
>
>
>>Second, I must clearly oppose your opinion that the quality of music
>>can be measured instead of perceived. There is a sound studio in
>>Erlangen, where Fraunhofer developed the sound and music MPEG
>>compression http://www.iis.fraunhofer.de/amm/index.html. Here
>>reknowned musicians and singers are employed on a consulting base to
>>find out the optimum compression algorithms. When they do NOT perceive
>
>
>>a difference between the original and the compressed music, then it is
>
>
>>a good algorithms, takning out thse parts of the sound spectrum which
>>does not add to the overall perceived. This can not be measured by an
>>instrument.
>
>
> This is not the same thing at all. A hi-fi system can be scientifically
> measured in all aspects. Compressing sound means removing large chunks
> out of the waveform. Decompressing means trying to restore as much of
> the removed stuff as possible. This is very tricky stuff but the MP3
> codec, which is what I assume you are talking about, may remove as much
> as 80-90% of the original data and then try to restore it. Of course,
> this is totally impossible, but a good codec will make a darn good guess
> at restoring most of it, but certainly not all. A listening studio is
> therefore necessary to make a judgement as to whether a
> compression/decompression system is acceptable to the ear and has
> nothing to do with the linearity of amplifiers, i.e., whether the ear
> can perceive the results of the compression. Incidentally, MPEG stands
> for Motion Pictures Experts Group and .mpg files are videos. MPG codecs
> (seven to date are standardised, but MPEG-1, -2 and 4 are the most used)
> are essentially for videos to which you can attach any one of a few
> audio systems, such as AC3 (Dolby surround), .wav or even uncompressed
> sound. In the US, most modern DVDs use AC3 attached to MPEG-2 video.
> This is slowly coming into Europe, but only the most modern PAL DVD
> set-top players have AC-3 decoding (question of licensing from Dolby).
>
> Best regards,
>
> Brian
>
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