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  #21  
Old 07-10-2007, 10:25 PM
Neon Flea Neon Flea is offline
 
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Quote:
Originally Posted by DJ Smithy View Post
I'd say 2 cheap stereo amps it is then!

Finding a 4 channel amp (in cork especially) is too much effort.
yep - the simplest do-it-all-tomorrow-if-you-like solution.
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  #22  
Old 07-10-2007, 10:31 PM
DJ Smithy DJ Smithy is offline
 
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Edit: You can skip this post and the next Beaty, nerdy giberish going on!

Just to complicate things a bit further...

Is this a pending patent i see for the 4 channel sound system we're trying to find?

http://www.freepatentsonline.com/6934394.html
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Last edited by DJ Smithy; 07-10-2007 at 11:44 PM..
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  #23  
Old 07-10-2007, 10:45 PM
DJ Smithy DJ Smithy is offline
 
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See this is the heart of the problem:





4.1 surround sound systems these days only exist in desktop pc setups like that one.

You can only buy these all-in-one setups (amp (built into sub) plus 4 speakers).

You cant seem to buy a 4 channel amp on its own without the speakers.

I wonder do they even exist, hence that patent.
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  #24  
Old 07-10-2007, 11:01 PM
DJ Smithy DJ Smithy is offline
 
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Quote:
Originally Posted by Beaty View Post
T

They're for an office - for sales presentations (slideshows with sound) - we said we'd spend the money rather than pay it on TAX!
Sorry for ruining the thread with this nerdy 4.1 discussion!

Now getting back to your needs, will you even ever use surround sound?
I.e from surround sound cds, or DVDS ?
And do you already have a Multichannel Sound card?
Or is it just stereo? (one line output)

If your doing sales presentations its more than likely always going to be in stereo. (Left & right).

If stereo is cool with you then the cheapest solution is to buy one amp.
And wire the 4 speakers into the outputs (for 2 speakers normally).
That will mean Front Left and Back left will be sharing an output, and the same with Front Right and back Right.

Im not sure how safe this is, so go over it with Neon Flea.
I dont know what wattage is required for it.


Or
else just buy 2 amps, plus a multichannel sound card,a 4.1 card will do. (2 line outputs)

Or you could just buy 2 amps, and use a standard stereo soundcard, and plug a stereo splitter into the card like this one:


This will save you buying a multichannel sound card.
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  #25  
Old 07-10-2007, 11:30 PM
Neon Flea Neon Flea is offline
 
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Quote:
Originally Posted by DJ Smithy View Post
Sorry for ruining the thread with this nerdy 4.1 discussion!
yeah , never ask enthusiastic people - you always get more info than you want!

Quote:
Originally Posted by DJ Smithy View Post

If stereo is cool with you then the cheapest solution is to buy one amp.
And wire the 4 speakers into the outputs (for 2 speakers normally).
That will mean Front Left and Back left will be sharing an output, and the same with Front Right and back Right.

Im not sure how safe this is, so go over it with Neon Flea.
I dont know what wattage is required for it.
As i said earlier, it would probably be fine, but don't use a really cheap amp to do it.
If you could visualise an amp as a water pump, the voltage is the pressure output and current is the actual flow/volume of water, then adding a second pipe of equal resistance on the pump output will :
a) half the pressure (give or take)
b) require twice the volume of flow (current) to get the same loudness out of each of the 4 speakers as it would have done if the speakers were set up as a single stereo pair.

Now assuming those speakers are 8ohms (the Bose manual doesn't confirm that), then a good quality consumer level hi-fi amp will have no problems - most will work without a worry at 4ohms. Such a thing would probably cost twice the price of one cheapy argos amp though...but i couldn't claim that to be the definitive answer.

Quote:
Originally Posted by DJ Smithy View Post

Or
else just buy 2 amps, plus a multichannel sound card,a 4.1 card will do. (2 line outputs)

Or you could just buy 2 amps, and use a standard stereo soundcard, and plug a stereo splitter into the card like this one:


This will save you buying a multichannel sound card.
yeah! right-on!
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  #26  
Old 07-10-2007, 11:43 PM
DJ Smithy DJ Smithy is offline
 
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Quote:
Originally Posted by Neon Flea View Post

Now assuming those speakers are 8ohms
It probably says the ohmage (impedance ) on the back of the speakers.
But, is it worth getting a ladder and risk pulling them off the wall to find out is the thing!

Damn, i never thought of Ohms Law Flea!

I was more worried about impedance with the 4 speakers connected to the one amp.

Wouldnt the impedance be halfed?
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Last edited by DJ Smithy; 08-10-2007 at 12:06 AM..
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  #27  
Old 08-10-2007, 12:53 AM
Neon Flea Neon Flea is offline
 
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Quote:
Originally Posted by DJ Smithy View Post
Wouldnt the impedance be halfed?
Yup, indeed it should. did i say it the other way round? whoops if i did...
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  #28  
Old 08-10-2007, 05:48 AM
Beaty Beaty is offline
 
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Jaysus lads - what happened when I went to bed!?

Can we pen the utimate guide for wiring these speakers!

One final - Do this Beaty!

Many thanks for your boffinisim!

B
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  #29  
Old 08-10-2007, 11:58 AM
DJ Smithy DJ Smithy is offline
 
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What soundcard do ya have first?
A normal one with one output, or do you have a multichannel one?
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  #30  
Old 08-10-2007, 03:43 PM
Beaty Beaty is offline
 
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Quote:
Originally Posted by DJ Smithy View Post
What soundcard do ya have first?
A normal one with one output, or do you have a multichannel one?
DJ Smithy, I have a 'normal one' but can go 5.1 if your expertise tells me so.

B!
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