Re: TV and sound over CAT5

["Dr John Tankard" <jtankard@xxxxxxx>]

Keith I am a bit of a novice in this department, please explain more about
balanced audio. I want to feed my HiFi from a MP3 source, I dont want to
have a computer in my HiFi stack if I can help it, can I use this to feed a
output from a sound card to my amp ? what cable should be used ? is there a
detectable loss in quality ? over what distance ?

Sorry for all the basic questions

Best regards

John. (still working on the lighting system. Now talking to HomeVision !)
jtankard@xxxxxxx

> -----Original Message-----
> From: Keith Doxey [mailto:keith.doxey@xxxxxxx]
> Sent: 27 July 1999 09:41
> To: 'ukha_d@xxxxxxx'
> Subject: [ukha_d] Re: TV and sound over CAT5
>
>
> Hi Tim,
>
> As I said....
> IN MY PERSONAL OPINION.
> Your views and those of many others will differ greatly on this
> as it is a
> very hotly debated subject.
>
> When I was over in Northern Ireland visiting Mark a couple of
> months ago we
> went to a Hifi show. Out of interest I sat through a
> demonstration of high
> grade cables etc. I PERSONALLY couldnt detect ANY difference but then
my
> hearing has been subjected to 20 years of abuse running and
> servicing disco
> equipment.
>
> Whilst I am not by any means deaf, I do have a small degree of high
> frequency loss. The one thing that I do notice easily is hum,
distortion,
> clipping rattles and any other nasty artifacts that detract from
> the source
> you are trying to listen do.
>
> I agree with you entirely about the benefits of Bi-Amping, in fact
most
> larger professional sound systems are usually Tri-Amped as a minimum.
> Somtimes even 4 or 5 way split. The one thing I dont see is the
> point in is
> Bi-Wiring. The whole point behind Bi-Amping is that heavy bass
transients
> dont cause colouration of the mid and high frequencies, with
> Bi-Wiring both
> sets of speakers are being fed from the SAME amplifier so any
transients
> introduces into the amp will affect both sets of speakers.
>
> By hype I meant things like directional arrows on the cable sheath. An
> audio signal is AC which means the current flows both ways so how
> can it be
> directional. If you go into any professional audio environment you
wont
> find any 99quid phono leads or such like. What you will find is
BALANCED
> AUDIO running everywhere. With balanced audio, earth loops become a
thing
> of the past and any interference becomes self cancelling. You can
> even use
> unscreened cable if you wish but the cables are generally
> screened just to
> provide an extra obstacle to the interference.
>
> When I first visited Mark in Northern Ireland I demonstrated how
> resisitant
> to interference balanced audio really is. I first set up a balanced
audio
> link between a sound source and his amplifier. I then deliberately
> connected the output of a CD player via a 300 ohm resistor to one lead
of
> the twisted pair carrying the balanced signal. The CD was plainly
audible
> above the original source. I then connected the CD player to both
> wires of
> the twisted pair via individual 300 ohm resistors and only the
original
> source was audible.
>
> To prove that both signals were indeed present on the cable I
> connected the
> amplifier to one wire of the twisted pair at the receiver end
> instead of to
> the output of the balanced line receiver. Both signals were audible.
Then
> just as a party piece I used both wires of the twisted pair fed via
300
> resistors into the amp, the original wanted signal being balanced
(equal
> but opposite) cancelled out and only the CD player was audible with a
bit
> of hum due to the earth loop problems that normally affect unbalanced
> connections.
>
> The level of interference I introduced was far in excess of anything
you
> would normally get in even the most hostile of environments and the
> hardware used cost under 10 quid. If I had the cable I could have run
it
> over 1km with no noticable difference. Now do that with a 1 metre 99
quid
> phono lead :-))
>
> The best thing I ever read in a Hifi magazine was
> "Stop spending money when YOU cant notice any improvement"
> It works for me.
>
> If you feel that you need the Audiophile cables thats fine by me,
after
> all, its your money.
>
> Keith
>
> Keith Doxey
> http://www.btinternet.com/~krazy.keith
> Krazy Keith's World of DIY Home Automation
>
> While I wouldn't dream of taking issue with on your electrical
knowledge
> Keith, I'm afraid I couldn't let this pass without comment.
>
> While QED 79 or 46 strand is more than adequate for piping
"audio" around
> the house, for example a pair of speakers set high up into the wall in
the
> kitchen, bathroom or bedroom for background music, audiophile cables
do
> have
> their place.
>
> <BIG SNIP>
>
>
>
>
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