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Jim Garten View Drop Down
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Points: 14693 		Direct Link To This Post Topic: One amp, 3 speaker sets?
    Posted: December 27 2007 at 04:06
OK hi fi people here's a (probably very basic & embarrassing) question.

We currently run a main set of speakers from our amplifier, plus the sub woofer from the second output; we want to run a second set of Mordaunt Shorts as well (2 full sets + sub woofer...)...

Now I know you can get a speaker switch:



...and I know this reduces the impedance from 8 to 4 ohms (which virtually all speakers can handle), but any cautionary notes...?

...in laymans terms please!

Cheers

Jon Lord 1941 - 2012
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oliverstoned View Drop Down
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Points: 6308 		Direct Link To This Post Posted: December 27 2007 at 05:06
You can plug both a pair of speakers and the cable's pair to the sub on the same output. You can use speaker's cable to your sub (if it accept it), the cable will work as a modulation/link cable, the signal is re-worked by the sub then.
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Jim Garten View Drop Down
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Points: 14693 		Direct Link To This Post Posted: December 27 2007 at 05:25
Cheers Oliver

I seem to remember though that when we originally bought the s/w we wired it to the amp & our main speakers from the s/w (as recommended by the s/w's instructions), but this removed virtually all bass signal from the speakers themselves; what we want is for two sets of normally working speakers plus the sub woofer...

Jon Lord 1941 - 2012
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Points: 6308 		Direct Link To This Post Posted: December 27 2007 at 05:45
Strange...i don't see why the speakers should be wired from the sub...
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Dean View Drop Down
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Points: 37575 		Direct Link To This Post Posted: December 27 2007 at 06:29
Originally posted by oliverstoned oliverstoned wrote:

Strange...i don't see why the speakers should be wired from the sub...
The impedance loading of the sub will be non-linear with frequency so it will affect the crossover unit in the main speakers via the speaker cable, resulting in a reduction of bass response.
 
This is because the loading is at the wrong-end of the speaker-cable - both speaker sets should have been connected directly to the amp by their own cables, which would then have used the low impedance of the amp to issolate the two speakers.
What?
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Jim Garten View Drop Down
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Points: 14693 		Direct Link To This Post Posted: December 27 2007 at 06:36
That explains that then - back to the original question then - if I were to use a speaker switch to allow a further set of speakers, do you see a problem?

Jon Lord 1941 - 2012
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Dean View Drop Down
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Points: 37575 		Direct Link To This Post Posted: December 27 2007 at 06:39
n-n-n-n-n-n-no-no-no-no-no-no Jim.
What?
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Points: 1049 		Direct Link To This Post Posted: December 27 2007 at 09:01
I tried running two speakers from a sub woofer once .. it worked but sounded muddy and slightly out of phase (not sure why)  .. in the end I realised that a Yamaha  pro logic amp with 5 channel stereo function is what I needed to get the job done properly ... so I got it,  wasnt  that expensive either.  Sub woofers work best with an outlet from the amp designed to filter through the sub sonic sounds ,  I let the other five  speakers (including center)  take care of the the rest  the end result is pretty impressive and I didnt spend a fortune. 


Edited by Yorkie X - December 27 2007 at 09:11
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Jim Garten View Drop Down
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Points: 14693 		Direct Link To This Post Posted: December 27 2007 at 11:07
Thanks for all your responses guys - much appreciated; spoken to my hi-fi dealer of choice & explained the issues/concerns etc & he sees no problems - he's going to go through it on Saturday with us, so all fingers crossed.

Thanks again

Jon Lord 1941 - 2012
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