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#340917 - 03/06/11 08:58 AM 6 speakers from 1 amp
nigel55555 Offline
newbie

Registered: 03/06/11
Posts: 3
Hello there,

I've recently started a small business and have a shop with 4 small floors all needing music in. We have a very limited budget so need to spend as little as possible which rules out all normal multi-room solutions.

I have 4 small floors, all needing a small stereo pair of speakers running from one source.

So, if I get a four channel amp like this:
http://www.richersounds.com/product/amplifiers-receivers/teac/ag790/teac-ag7090

Then put 2 sets of 8omh speakers into each pair of channels (totaling 4 pairs of speakers). Speakers like this:
http://www.richersounds.com/product/bookshelf-speakers/gale/3010s/gale-3010s-bch

That that would mean 4ohms into each pairing and the amp wouldn't blow right?

Any help would be much appreciated. All my local High-Fi shops are telling me NOT to do it but I get the feeling this is just because they don't want to be held responsible to any unfortunate consequences.

It's so hard for small businesses these days, every penny counts!

Thanks so much,

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#340919 - 03/06/11 09:14 AM Re: 6 speakers from 1 amp [Re: nigel55555]
Adrian Offline
axiomite

Registered: 12/27/08
Posts: 6874
Loc: It's all about the location.
Welcome Nigel. I would think* you'd be ok if you're not running the speakers in parallel off of the same channel (where the ohms would drop considerably) but with 4 channels. Alan Lofft wrote an article that may help you.

You may possibly require an impedence matching selector switch(not expensive at places like Parts Express)....I've never tried this, so hopefully someone with more knowledge will pipe in.


Edited by Adrian (03/06/11 09:25 AM)
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#340923 - 03/06/11 09:49 AM Re: 6 speakers from 1 amp [Re: Adrian]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6789
Loc: The Peoples Republic of Il.
Using a speaker selector switch should work.

Here's an article refering to them.
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"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#340930 - 03/06/11 10:23 AM Re: 6 speakers from 1 amp [Re: Wid]
nigel55555 Offline
newbie

Registered: 03/06/11
Posts: 3
Thanks for your help!

Should something like this connected to a standard inexpensive amp and 4 sets of speakers do it?

http://www.amazon.co.uk/4-Channel-Stereo...4881&sr=1-1

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#340933 - 03/06/11 10:54 AM Re: 6 speakers from 1 amp [Re: nigel55555]
nigel55555 Offline
newbie

Registered: 03/06/11
Posts: 3
Blimey, this bit of kit's only £20, would this do the job for me?

http://www.maplin.co.uk/4-way-stereo-speaker-switch-box-97929

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#340937 - 03/06/11 11:31 AM Re: 6 speakers from 1 amp [Re: nigel55555]
alan Offline

connoisseur

Registered: 01/29/02
Posts: 3258
Loc: Toronto/New York/parry Sound
Nigel,

I'm not familiar with that particular switch box, but the specs mention that the box maintains impedance at 4 ohms, so you should be alright with it provided you use an amplifier/receiver that will drive 4 ohms without triggering its protection circuitry.

Look at Denon, which here at Axiom, have been very reliable driving the Axiom 4-ohm M80 v3 tower speakers.

Impedance-matching switch boxes do involve sonic compromises, but for your application it should be OK.

For better quality, you could, as my colleague Brent mentioned to you in the private email, go to Russound or Niles for constant-impedance switchers.

Regards,
Alan
_________________________
Alan Lofft,
Axiom Resident Expert (Retired)

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#340949 - 03/06/11 03:51 PM Re: 6 speakers from 1 amp [Re: alan]
Cork Offline
old hand

Registered: 03/19/10
Posts: 98
Loc: Pennsylvania, US
I have to ask, why not connect the speaker pairs in series and not worry about the effect of dropping to 4 ohms? To wire in series you'd connect each pair as rcv+ to spkrA+, spkrA- to spkrB+, spkrB- to rcv-.

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#340953 - 03/06/11 04:32 PM Re: 6 speakers from 1 amp [Re: Cork]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
Wired in series would present a 16 Ohm load. Not really a big deal, but you'd need to increase the volume level to get the same output.

The real problem with wiring speakers in series, is they are not a fixed 8 Ohm load, but a reactive load that changes impedance depending on the frequency of the signal driving them. The driver's native impedance is balanced with the crossover network to allow a linear frequency response. When the loads in are series with each other, the impedance peaks grow even larger, while the low points don't pile up as much. Since the peaks usually exist in the treble range, this would have the effect of rolling off the highs, and thus causing a less than linear response.

You really want each speaker to be connected to its own amplifier output, no parallel wiring, and definitely no series. Impedance-matching switches only go so far. They're still not some thing you want involved in a high quality playback system. But for in-store music, who cares? And he's not thinking about using Axiom speaker in the shop either; quality is not high on the list.
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#340960 - 03/06/11 05:57 PM Re: 6 speakers from 1 amp [Re: ClubNeon]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
I would be looking at using a multi zone/channel amp to run all those speakers, something like this......

http://www.ada.net/products/ht/ptm_8100.php
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Jason
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#340970 - 03/06/11 09:12 PM Re: 6 speakers from 1 amp [Re: nigel55555]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10621
Nigel, welcome. Since you haven't really described "needing music" in detail, I'm left wondering if the discussion so far hasn't been at an unnecessarily complex level. If the music isn't directly related to your business activity, but is just for a pleasant background, it would seem that placing an inexpensive compact stereo system in each room might be satisfactory. This would probably be less expensive and certainly would be less complicated.
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