How to Connect 2 Speakers to 1 Amplifier

In this article we look at how and when to connect 2 speakers in parallel or series. Both the theory and practical points on how to connect 2 speakers are discussed. Connecting 2 speakers in parallel or series to your amplifier is useful when:

  • you don’t need to turn each speaker on or off individually, or
  • you don’t need to have separate volume controls for each speaker.

If you need to turn each speaker on or off individually or have separate volume controls, you may need a speaker selector switch. In this case you should read the articles on connecting multiple speakers, wiring 4 speakers, and/or my summary of speaker selector switches.

Many people get confused when we talk about a stereo amplifier. A stereo amp simply has two amplifiers built into the one box. We are not talking about connecting two speakers to a stereo amp, as that simply involves connecting one speconenct 2 speakers to stereoaker to each amplifier (left and right). There are many cases when you want to connect four speakers to a stereo amp, that is, to connect 2 speakers to each amplifier – or four speakers in total. For the rest of this article, when we talk about an amplifier, we are talking about either the left or right amplifier only.

You may want to connect 2 speakers to one amplifier without individual switching or volume controls if you:

  • have a large living area with four ceiling speakers, or
  • want to cover a large backyard with four speakers, or
  • have any situation where two speakers are not enough.

The are two basic ways of connecting two speakers together – either in series or parallel.

Should 2 speakers be connected in Series or Parallel?

Whether 2 speakers connected to one amplifier should be in series or parallel mostly depends on the impedance of the speakers.

The impedance of the speakers should be written on the back of the speaker Connect 2 speakers 8 ohmsor speaker box. The impedance of a speaker is normally 4 ohms, 6 ohms or 8 ohms. If it isn’t written on the back of the speaker, check any paper work that might have come with the speaker, or look up the specifications on the web. The Ω symbol is often used instead of writing “ohms”.

If both speakers are 8 ohms or more, then the speakers can normally be wired in parallel.

If the speakers are less than 8 ohms, then to be safe, you should wire them in series.

Connect 2 Speakers in Parallel

To calculate the total load impedance of speakers in parallel, see my Speakers in Parallel Calculator.

If both speakers are 8 ohms or more, then it is normally safe to connect them in parallel. This is because two 8 ohm speakers in parallel makes the total load impedance 4 ohms. Most HiFi amps are designed to have a total load impedance of 4 ohms or higher, but not lower than 4 ohms. If your amp is not specified for 4 ohms (some are 6 ohms or 8 ohms minimum), then you should consider wiring your two speakers in series.

This diagram helps show why speakers connected this way are called “in parallel”

Connect 2 speakers in parallel

They are known as being in parallel because, well, they are wired in parallel. Admittedly, I’ve drawn them so they look like being in parallel. However, in practice, we wouldn’t use so many cables and connections. For practical ways of connecting 2 speakers in parallel, see the table below.

If your amplifier has an A and B speaker selector, you can use this for a simple way of connecting two sets of speakers in parallel.

Connect 2 Speakers in Series

To calculate the total load impedance of speakers in series, simply add the impedances together

If both speakers are less than 8 ohms, or the amplifier requires a total load impedance greater than 4 ohms, then it is best to connect the speakers in series. This is because two 4 ohm speakers in series makes the total load impedance 8 ohms. Two 6 ohm speakers in series makes the total load impedance 12 ohms. Most amps work fine with a load impedance of 6-16 ohms.

This diagram helps show why speakers connected this way are call “in series”

Connect 2 speakers in series

As you can see, the two speakers are in “series” with the each other.

How to Connect 2 speakers in Parallel and Series

Below is a table showing how to wire up two speakers in parallel and series for common scenarios. Keep in mind these diagrams are for one amp only (let’s say the left amp), you will need to duplicate this for the right amp also.

If you double click on a diagram you should see a slightly larger version for easier viewing.

Practical Ways to Connect 2 Speakers in Parallel and Series
When all cables are run back to the amplifier location
Connect 2 speakers in parallel
Parallel: Both speaker cables are connected directly to the amplifier
Connect 2 speakers in series
Series:Join two of the wires as shown separate to the connections on the amp.
When the second speaker needs to be connected off the first speaker
Connect 2 speakers in parallel
Parallel: Join the cables of the second speaker to the cables on the first speaker
Connect 2 speakers in series
Series: Cut one wire near the 2nd speaker, and connect the 2nd speaker "in series" with the cut wire.
When there is a (long) cable run to be split to go to both speakers
Connect 2 speakers in parallel
Parallel: Join the cables from both speakers to the cable from the amplifier
Connect 2 speakers in series
Series: Join the two speakers in series, then join this to the feed cable
When the cables from each speaker come back to a wall plate
Parallel: Simply join the terminal as shown
Parallel: Simply join the terminal as shown
Connect 2 speakers in series
Series: The series connection is made with one join

You may have noticed that no matter which scenario is used, all the parallel diagrams are technically wired the same as each other – if you doubt me, trace the connections with your fingers on any two of the parallel connection methods. You can do the same for the series connections below as they are also the same as each other.

Keep in mind that changing the total load impedance of an amplifier will increase or decrease the power output of the amplifier. Connecting in parallel normally increases the output power, while a series connection normally decreases the power output of an amplifier. See Multiple Speakers Change Amplifier Power for more details.

Each speaker may have a different sensitivity which may mean there will be a level difference between them. For more on this see Understanding Speaker Sensitivity.

Also if the speakers each have a different impedance, then there will be different power levels available to each speaker. For more detail see How Multiple Speakers Share Power. 

Summary of Connecting 2 speakers

There are only really two ways to connect 2 speakers to one amplifier – either in parallel or series.

If each speaker has an impedance of 8 ohms or more, then you can generally connect them in parallel.download article

If each speaker has an impedance below 8 ohms, you should wire them in series.

If you need to switch each set of speakers on or off, or you want separate volume controls, see my articles on connecting multiple speakers, wiring 4 speakers and/or my speaker selector switch summary

If you still have a question on how to wire two speakers, please read the FAQs before submitting your question. You may also find an answer in the questions and answers below. 

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Riwan (Red Deer, Alberta, Canada)

Hi Geoff,

Thank you for the great article.

Currently I’m running two bookshelf speakers from my stereo amp (Onkyo A 9010). I am planning to add a powered sub woofer (powered) to the system. The sub has a high level/speaker level input. Based on my current research, I got the understanding that I could connect the sub using the parallel method?

Also, I am wondering if it is okay to wire both main speaker and sub cables without using any (banana) plug or connector to the same amplifier’s speaker output?

Thanks Geoff,

Riwan

Gary (Murray, KY)

Hi Geoff, Thanks for authoring and sharing these articles. Great information! I’m designing a system to have in my workshop, including the outside porch. My goal is to have background music, not a critical listening environment. That system is in the house. I’m considering 4 Paradigm Stylus 370-SM outdoor speakers (http://www.paradigm.com/products-current/type=outdoor/model=stylus-370-sm/page=specs) in stereo mode. Each speaker has both Left and Right amplifier connections. I would connect 2 speakers to the “A” speaker terminals and 2 to the “B” speaker terminals on a Yamaha R-N402 receiver (http://usa.yamaha.com/products/audio-visual/hifi-components/stereo-receivers/r-n402/?mode=model). In effect, there would be 4 speakers on each amplifier terminal. I would appreciate… Read more »

Larry (Bonaire)

Hi Geoff,

I have a Pyle PWMA1003T; here are the specs:
•1000 Watts Peak Power
•450 Watts @ 2 Ohms
•360 Watts @ 4 Ohms
•200 Watts @ 8 Ohms
I have one 8 ohm 500W TPD speakers hooked up to each amplifier(L and R)

There is a high pitched humm coming from the speakers regardless of the input source. Have any ideas what could be causing this?

Larry

Mike (Skillman NJ)

Hi Geoff – great article. Was hoping to run my possible setup by you and get your thoughts and suggestions. I’m in process of setting up my outdoor audio system. I have an Onkyo TX-NR646 with 2 zones to hopefully power all of my out door audio. Specs on receiver indicate the following: 170 W/Ch (6 Ohms, 1 kHz, 0.9% THD, 1 Channel Driven, FTC) and 100 W/Ch (8 Ohms, 20 Hz–20 kHz, 0.08% THD, 2 Channels Driven, FTC). I’d like to power a total of 3 pair of outdoor speakers from the onkyo. I have 1 pair of bose… Read more »

Dave Keilman (Roanoke VA, USA)

Hi Geoff – was hoping you can help answer this question. I currently have a Teac AI 2000 integrated amp powering 2 sets of speakers. One set of speakers is a large Monitor Audio rated at 4 ohms and the second set is medium size Monitor Audio rated at 8 ohms. Amp has binding posts for both sets and the amp handles both sets at the same time with ease and with audiophile sound being produced in the two different rooms where the speakers are located. I am considering switching to a high quality tube integrated amp that only has… Read more »

avik hira

hi
geoff,
i ve a creative 2.1 speaker system. can i connect another sub-woofer with the sub-woofer(bass woofer) of 2.1 speaker system?

Gary Fitzsimmons

Hey Geoff

So I have 4 – 16 ohm speakers I’d like to connect to a power amp, am I right in thinking that it is 16 divided by 4 giving me 4 ohms impendence… The amp I am using is rated at, ‘4 ohms minimum’

Thanks

Gary

Alex (San Luis Potosi, Mexico)

It’s fantastic how do you explain these issues, I got help from some friends and did not really understand them, even when they speak Spanish.

Seria fantastico que publicaras tambien en español!!

Thanks a lot !!!

PS I hope you understand me, I really not to speak english very well

Jeff (Edm, Ab)

Hello Geoff,
I’ve got 4 Klipsch RF82s and a NAD C356BEE amp.
2 of these speakers sound great, so I’m sure 4 will be greater. Can I just jumper from one speaker to the 2nd speaker? They have 2 sets of posts on each speaker. Also, when you talk of 4 or 8 ohm speakers, is this total of all speakers in the cabinet, or are they wired inside to total 8ohms?

David (Leeds, UK)

Hi Geoff,

Great article I just want to double check that I understand it correctly. I have two dual tweeter speakers (E-Audio Single Stereo Ceiling Speaker With Dual Tweeters from amazon) and this amp (LEPY LP 2024A+ Plus Amplifier) is it possible to run the two speakers in series using this amp?

Best wishes David