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Old 5th March 2015, 09:48 AM   #1
ODougbo is offline ODougbo  United States
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Default Three speakers to two channel amp?

Been looking on the web for an answer to this question and not finding much.
How to hook up three speakers to two channels?
Filling the room with sound on a tight budget is the goal, willing to sacrifice stereo separation.

The sketch may be the most common way, but unsure.

Another solution may be wire two speaker parallel (4 ohm) and add a heavy L-pad to the remaining 8ohm speaker for balance.

Any recommendations?
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Last edited by ODougbo; 5th March 2015 at 09:51 AM.
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Old 5th March 2015, 10:01 AM   #2
S4m is offline S4m  Germany
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Hi ODougbo,

Is the drawn amp the amplifier the one you are using for this setup?
AFAIK the Topping/class-D/class-T amps have a huge problem with changing impedances.
Using the (+) of the left and the right channel is often used in car-hifi and seems to work very well.
If you have a nice simple solidstate-amp I would advice you to try it in first instance with this one.

Edit: Add an L-Pad to the speaker to adjust the level. It can be louder than the left and right channel speaker.

Last edited by S4m; 5th March 2015 at 10:05 AM.
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Old 5th March 2015, 11:01 AM   #3
ODougbo is offline ODougbo  United States
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Thank you S4m,
Concerned that the digital might not be the best choice.
We do have low cost alternative: Audio Source Amp 100
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Old 5th March 2015, 11:17 AM   #4
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Switching the three speakers in series and bridging the power amp could solve the equation. But of course you need an inverter and a few resistors to bring the stereo signal back to mono. Alternatively switch two speakers in series and hook them up to either L or R and connect the remaining speaker to the other channel. That wouldn't cause any problems to the amp.
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Old 5th March 2015, 08:59 PM   #5
sippy is offline sippy  United Kingdom
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This post might be of help: Master Nagaoka Tetsuo explorations on matrixed single stereo speakers
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Old 5th March 2015, 10:08 PM   #6
sreten is offline sreten  United Kingdom
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Hi,

Note that most matrix circuits assuming a common
earth won't work well with the Topping at all, as it
bridged and there is no common earth.

rgds, sreten.
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Last edited by sreten; 5th March 2015 at 10:38 PM.
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Old 5th March 2015, 10:35 PM   #7
ODougbo is offline ODougbo  United States
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Sippy- thanks, for the link, very interesting. Will try the wiring on 1st post.

Sreten, thanks, going to try the low cost bridgeable amp.

Have a few options now!

These can can be found on sale for $99
http://www.amazon.com/AudioSource-AM...+source+Amp100
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Old 5th March 2015, 10:39 PM   #8
sreten is offline sreten  United Kingdom
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Hi,

What part of it won't work well do you not understand ?

rgds, sreten.
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Old 6th March 2015, 01:54 AM   #9
AllenB is offline AllenB  Australia
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What do you mean won't work well?

Is this (per channel) a pair of parallel amplifiers with balanced feed (through a phase splitter from unbalanced inputs) and the outputs taken balanced as well? As if this is the case they are all still referenced to ground, as are both of the input channels.

Last edited by AllenB; 6th March 2015 at 01:57 AM.
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Old 6th March 2015, 02:01 AM   #10
sippy is offline sippy  United Kingdom
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Quote:
Originally Posted by sreten View Post
Hi,

Note that most matrix circuits assuming a common
earth won't work well with the Topping at all, as it
bridged and there is no common earth.

rgds, sreten.
Didnt know that!
First leaning of the day for me on diya
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