🚀 go-pugleaf

Mario wrote:
> Hello,
> 
> Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
> and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
> web ?
> 
> OUTPUT should be possible to select them independently  or all
> together

When shopping at a food store, do you OUTPUT to get in the store, and 
INPUT to get out?

-- 
Adrian C

"Mario"  wrote ...

> Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
> and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
> web ?
>
> OUTPUT should be possible to select them independently  or all
> together

Sure. Go to a place like www.markertek.com and search for
"matrix router".  Dunno whether the prices for those commercial
units meets your (undisclosed) requirements?

Mario  <marmagi@hotmail.com> wrote:
>
>Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
>and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
>web ?

Stereo hi-fi signal?  Would that be a line level balanced signal, 
unbalanced signal?  Speaker level?  +4, -10, +8?  

>OUTPUT should be possible to select them independently  or all
>together

Select what?  There is only one input.  
--scott
-- 
"C'est un Nagra.  C'est suisse, et tres, tres precis."

On 16 Dic, 01:36, klu...@panix.com (Scott Dorsey) wrote:
> Mario  <marm...@hotmail.com> wrote:
>
> >Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
> >and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
> >web ?
>
> Stereo hi-fi signal?  Would that be a line level balanced signal,
> unbalanced signal?  Speaker level?  +4, -10, +8?  
>
> >OUTPUT should be possible to select them independently  or all
> >together
>
> Select what?  There is only one input.  
> --scott
> --
> "C'est un Nagra.  C'est suisse, et tres, tres precis."

I think I need what is called 8 way speaker switch

I need to connect a stereo source to 8 pairs of speakers selectable

On Tue, 16 Dec 2008 01:49:02 -0800 (PST), Mario <marmagi@hotmail.com>
wrote:

>I think I need what is called 8 way speaker switch
>
>I need to connect a stereo source to 8 pairs of speakers selectable

So you can't use a hi-fi amplifier and 8 ohm speakers - the load will
vary too much between having one pair of speakers and eight.  You'll
need a 70v line system.  Read about them here:
http://www.epanorama.net/documents/audio/70volt.html

The place that sells you a 70v output amplifier and the speakers will
also have switching boxes.

Mario wrote:
> I think I need what is called 8 way speaker switch
> I need to connect a stereo source to 8 pairs of speakers selectable

http://www.onidserv.com/speakercraft/product/167/SpeakerCraft-S8dc-Eight-Zone-Speaker-Selector

Owain

Mario  <marmagi@hotmail.com> wrote:
>
>I think I need what is called 8 way speaker switch
>
>I need to connect a stereo source to 8 pairs of speakers selectable

You can buy a device like this from a company like Niles.  However, you
will find out that you don't have independant level control, so unless all
the speaker pairs are the same the level will change as you go from one to
the next.

You will also find that the Niles devices present a different source impedance
to the speaker depending on how many you have selected.  This will change the
low end response somewhat.

But the Niles boxes have series resistances in them that get switched in and
out of circuit to make sure your amplifier never has too low a load impedance
on it.  It's not very elegant but it works okay at reasonable power levels.
--scott
-- 
"C'est un Nagra.  C'est suisse, et tres, tres precis."

"Mario"  wrote ...
> I think I need what is called 8 way speaker switch
> I need to connect a stereo source to 8 pairs of speakers selectable

What does "source" mean?  Exactly?
What does "speakers" mean?  Exactly?
This is not the kind of thing you can ask as a theoretical
question and expect practical recommendations.

On Dec 16, 7:45 am, klu...@panix.com (Scott Dorsey) wrote:
> Mario  <marm...@hotmail.com> wrote:
>
> >I think I need what is called 8 way speaker switch
>
> >I need to connect a stereo source to 8 pairs of speakers selectable
>
> You can buy a device like this from a company like Niles.  However, you
> will find out that you don't have independant level control, so unless all
> the speaker pairs are the same the level will change as you go from one to
> the next.
>
> You will also find that the Niles devices present a different source impedance
> to the speaker depending on how many you have selected.  This will change the
> low end response somewhat.
>
> But the Niles boxes have series resistances in them that get switched in and
> out of circuit to make sure your amplifier never has too low a load impedance
> on it.  It's not very elegant but it works okay at reasonable power levels.
> --scott
> --
> "C'est un Nagra.  C'est suisse, et tres, tres precis."

I bought a similar product by Adcom about 12 years ago.  Like the
Niles, not the most elegant solution, but it is simple and it works.

Dan (Woj...)

Would this 6 pair speaker selector help?    $31

http://cgi.ebay.com/6-Way-Stereo-Speaker-Selector-Switcher-Switch-100W_W0QQitemZ220329092543QQcmdZViewItemQQptZAU_Hi_Fi_Speakers?hash=item220329092543&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50

Doesn't powering multiple speakers simultaneously from one amp increase the 
load significantly (more than arithmetically)? 

> Doesn't powering multiple speakers simultaneously from one
> amp increase the load significantly (more than arithmetically)?

It depends on the speakers' impedances, and how the speakers are wired. The
net load impedance can be greater, the same, or less.

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message 
news:giegnv$ucq$1@news.motzarella.org...
>> Doesn't powering multiple speakers simultaneously from one
>> amp increase the load significantly (more than arithmetically)?
>
> It depends on the speakers' impedances, and how the speakers are wired. 
> The
> net load impedance can be greater, the same, or less.
>

And it may well vary from frequency to frequency....less at some frequencies 
and more at others, depending on the vagaries of the two speakers' 
impedances. 

Claude <Claude@invalid.com> wrote:
>Doesn't powering multiple speakers simultaneously from one amp increase the 
>load significantly (more than arithmetically)? 

It increases it arithmetically.  This is why the speaker switchboxes have
some big series resistors that they swap in and out to make sure the amp
sees an appropriate load.

When you parallel impedances, you add reciprocals.  So two eight ohm speakers
in parallel gives you 1/8+1/8=1/4 for a total of four ohms.
--scott

-- 
"C'est un Nagra.  C'est suisse, et tres, tres precis."