Re: Whole-house audio

["Brendan" <jbh@xxxxxxx>]

No probs Jerry.
Will pop in mail on Fri.

Brendan

-----Original Message-----
From: Jerry Treweek <J.treweek@xxxxxxx>
To: ukha_d@xxxxxxx <ukha_d@xxxxxxx>
Date: 03 November 1999 15:41
Subject: [ukha_d] Re: Whole-house audio


>Hi Brendan,
>
>thats a very kind offer - yes please!
>
>Jerry Treweek
>2 Rutland Avenue
>Lancaster
>LA1 4EZ
>
>Enclose your address and I'll happily cover your costs.
>
>Thanks
>
>
>Jerry
>
>
>
>
>Brendan wrote:
>
>> 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
>> >
>>
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>> >
>> >
>>
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