Ohm load of speakers in series? - Home Theater Forum and Systems - HomeTheaterShack.com
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post #1 of 15 Old 05-20-18, 03:17 PM Thread Starter
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Ohm load of speakers in series?

A pair of 8 ohm speakers, and a pair of 4 ohm speakers are wired in series.
What is the ohm load felt by the amplifier?

I know that two 8 ohm speakers in series would be 4 ohm.
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post #2 of 15 Old 05-20-18, 03:48 PM
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Re: Ohm load of speakers in series?

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A pair of 8 ohm speakers, and a pair of 4 ohm speakers are wired in series.
What is the ohm load felt by the amplifier?

I know that two 8 ohm speakers in series would be 4 ohm.
Two 8ohm speakers in series would be 16ohms but two 8ohm speakers in parallel would be 4ohms.
Two 4ohm speakers in series would be 8ohms but two 4ohm speakers in parallel would be 2ohms.
An 8ohm and a 4ohm speaker in series would be 12ohms but, in parallel, they would be 2.67ohms.

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post #3 of 15 Old 05-20-18, 05:55 PM Thread Starter
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Re: Ohm load of speakers in series?

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Two 8ohm speakers in series would be 16ohms but two 8ohm speakers in parallel would be 4ohms.
Two 4ohm speakers in series would be 8ohms but two 4ohm speakers in parallel would be 2ohms.
An 8ohm and a 4ohm speaker in series would be 12ohms but, in parallel, they would be 2.67ohms.
Thanks.
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post #4 of 15 Old 05-20-18, 06:03 PM
 
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Re: Ohm load of speakers in series?

All four of those, wired in series? Since wiring in series is cumulative, all four of those in series would be 24 ohms.

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Wayne A. Pflughaupt



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post #5 of 15 Old 05-20-18, 06:09 PM Thread Starter
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Re: Ohm load of speakers in series?

I have a spare set of very nice tower speakers, 8 ohms. My main L&R speakers in the theater are 4 ohms. I was just wondering if they could be connected so all 4 could be used. My amp is only rated for 4 ohm loads.
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post #6 of 15 Old 05-20-18, 06:29 PM
 
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Re: Ohm load of speakers in series?

Okay, that’s not four wired in series, only two.

Question: Do you know the difference between series and parallel wiring? Because, if you connect the second speaker to the amplifier the same way the first one is, that’s parallel, and you’ll have a load lower than 4 ohms.

Wayne A. Pflughaupt



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post #7 of 15 Old 05-20-18, 08:23 PM Thread Starter
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Re: Ohm load of speakers in series?

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Okay, thatís not four wired in series, only two.

Question: Do you know the difference between series and parallel wiring? Because, if you connect the second speaker to the amplifier the same way the first one is, thatís parallel, and youíll have a load lower than 4 ohms.

Wayne A. Pflughaupt
Yes, I was just trying to find a way to use these extra towers. The ohm load may not work. Donít want to drop much below 4 ohms.
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post #8 of 15 Old 05-20-18, 08:26 PM
 
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Re: Ohm load of speakers in series?

It'll work if you wire them in series, but not in parallel.

Regards,
Wayne



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post #9 of 15 Old 05-20-18, 08:38 PM Thread Starter
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Re: Ohm load of speakers in series?

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It'll work if you wire them in series, but not in parallel.

Regards,
Wayne
With that, is there any reason NOT to do this? Two pair of VMPS towers, 8 ohm / 4 ohm. The sound is nearly identical, and they are not super efficient. Probably around 88 db.
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post #10 of 15 Old 05-21-18, 06:23 AM
 
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Re: Ohm load of speakers in series?

Well, you have to wonder, if dual speaker pairs was a great idea, everyone would do it and it would be a pretty common thing.

There are a few potential problems.

For one, a series connection pretty much cuts amplifier power in half, which is then divided between the two speakers. So, an amp with 100 watts (per channel) at 8-ohms becomes a 50-watt amp at 16-ohms. That is divided between the two speakers, so they’re each only getting 25 watts. Power calculation is bit trickier in your case – you’d probably end up with 12 ohms per channel with both speakers in series, which would theoretically get you something like 75 watts per channel, again divided between the two speakers.

The other issue is that the sound from respective drivers will be arriving at your ear at different times. IOW, with the speakers side by side, the sound from the “outboard” speaker will reach your ears later than the inside speaker. The result is a phenomenon called comb-filtering. You can probably hear it as a difference in the soundstage, or even a strange timbre-shift as you move your head slightly left or right.

Still, experimenting never hurts. You aren’t going to blow anything up – the worst that can happen is that you don’t like it. But hey, maybe you will!

Regards,
Wayne A. Pflughaupt



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