Re: Whole-house audio

["Brendan" <jbh@xxxxxxx>]

Folks,

Think I might have an answer to your requirement.

I have an article published by Steve Ciarcia in 1986 covering design of a 8
x 8 cross-bar switch (scalable in multiples) allowing any Audio / Video i/p
to be switched to any of the
8 (or multiples of) o/p.
Utilises RCA 74HC22106 crosspoint switch which presents some 95 ohms ON
resistance and some 9MHz bandwidth.
Routeing of any i/p to any o/p is achieved by clocking a 6-bit address onto
the switch.

I obtained this some years ago wvt building but it is, unfortunately, one
of
the many items I have never 'got around to' ... so no info on its operation
in anger.

If any of you interested I'd be happy to snailmail photocopies of the
article of scan and mail
(15 pages).

Let me know.

Brendan
-----Original Message-----
From: Nigel Orr <nigel.orr@xxxxxxx>
To: ukha_d@xxxxxxx <ukha_d@xxxxxxx>
Date: 03 November 1999 08:50
Subject: [ukha_d] Re: Whole-house audio


>At 16:39 02/11/99 +0000, you wrote:
>>I'm working on a similar idea. I would like to distribute hifi -
(yes
hifi)
>>from a central system, the intention being to have computer control
over
the
>>routing at some future point.
>
>'Me Too'...
>
>>people who share the house...) so I've been turned into a carpenter
making
>>stair gates - anyway I digress...
>
>If you hadn't been digressing, you might not have had to make stair
gates
;-)
>
>>The idea of a multi-input multi-zone amp sounds rather like 100volt
speaker
>>drivers - I really don't think you're going to get hifi quality
through
that.
>
>Not necessarily.  Lots of the big PA systems (EAW, Meyer etc) use high
>voltage distribution rather than 8 ohm, just to cut the losses in the
line.
> There are good music quality 100V transformers around (try Canford,
for
>starters), but good transformers aren't particularly cheap.  There are
also
>some speakers (like the odd looking Canon wide dispersion thingys) that
>come with 100V as an option instead of 8 ohm.
>
>>You really do need an amp (preferally with a differential/balanced
input)
>- eg
>>Samson 'servo' series of studio amps (excellent value)
>
>I'd agree with that as the best approach, but for some rooms where you
>don't want 'things', a central amp would be better.  In a typical
house,
>with speakers run on 2.5mm T&E mains cabling, there would be few
who could
>claim to notice the difference between a 2-3m run and a 10-20m one.
>However, the potential interference from the long runs of cable near
other
>signal cables might be an issue.
>
>>I think that using a network link and mp3'ing to each room is a
very
>expensive
>>way to go
>
>Agreed 110%!  At least for now.  MP3 decoders are actually getting
_very_
>cheap, but if you've run cat-5 for audio, you might be able to use the
same
>cable for digital audio and video in future.  That'll be the Kat-5
plus,
>right Keith?
>
>Nigel
>
>------------------------------------------------------------------------
>-- 20 megs of disk space in your eGroup's Document Vault
>-- http://www.egroups.com/docvault/ukha_d/?m=1
>
>
>


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