Can I Use 2 Bookshelf Speakers as a Center Channel? (Truth!)

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Can I Use 2 bookshelf Speakers as a Center Channel? (Truth!)


Can I Use 2 bookshelf Speakers as a Center Channel?

Someone recently asked me the question can I use 2 bookshelf speakers as a center channel?

This then led me to wonder how many people might have tried to do this.

So I figured I’d answer this very question in detail to hopefully shed some light on whether it’s a good idea to do this.

Let’s find out!

Can I Use 2 bookshelf Speakers as a Center Channel?


It generally isn’t a good idea to use 2 bookshelf speakers as a center channel since audio cancellation can occur from nulls. However using 1 speaker as a center channel is acceptable as 3 identical speakers in a line array can produce a more realistic result when the sound pans from one side to the other.

 

 

The Function Of A Center Channel Speaker


Just to reiterate, a center channel speaker’s function is to reproduce a large portion of the dialogue and sound effects present in the content.

In fact, it can in some cases be tasked with up to 80 percent of the sound mix.

This makes it an extremely important component in a home theater.

The kind of speaker you use as a center channel speaker though will depend on your listening conditions, the quality of that speaker, the type of left & right speakers you’re using with that center, and even the amount of power they have.

These are important things to remember — especially if you’re thinking about using a bookshelf variant as a substitute, since there are various do’s and don’ts to keep in mind.



Using 1 Bookshelf Speaker As a Center Channel Speaker


So is it a good idea to use a single bookshelf speaker as a center channel speaker?

Yes if you don’t have a dedicated center, using a bookshelf speaker of the same model is perfectly acceptable.

In fact some audio professionals and even Dolby Labs use this configuration for their audio.

The biggest between the two is that traditional center speakers will have  two mid drivers and a tweeter, whereas a bookshelf speaker will typically have one.

This can have implications as far as the reproduction of certain frequency ranges, but even that’s dependent on the exact equipment you have.

If you do use one in this manner, it’s highly recommended that it tonally matches the other 2 front speakers to maintain a cohesive soundstage.

This integration is known as timbre matching, and it’s particularly important that the speakers are of a similar make and model to uphold audio quality otherwise the sense of immersion falls apart when sounds pan from left to right.

The only reason bookshelf speakers aren’t used as often is because the horizontal orientation of center channel speakers better accommodate for limitations when accounting for space in a home theater.

It’s not practical a lot of the time because a vertically placed speaker would likely block the screen; so people simply opt for the alternative.

But surprisingly, using 3 of the same speaker for the front stage can actually work better in some cases — even offering better uniformity.

That’s not definitive though, as there’s so many factors that can influence this either way.

Ultimately you’ll have to listen for yourself to see how it sounds in your particular environment.



Where To place The Bookshelf Speaker If You Use it For The Center Channel?


However if you do try this, you don’t want to place the bookshelf speaker in the middle of this configuration on its side because not only is it not designed for that, it can also cause issues with crossover process between the woofer and the tweeter.

You want place the speaker right side up and as even with the L&R speakers as possible without blocking the screen.

More specifically, the reason why center channel speakers can be placed sideways while bookshelf speakers can’t has to do with their very design.

When you place a speaker sideways that only has 1 driver and 1 tweeter, the sound dispersion gets shifted causing peaks and dips in volume, problems with the crossover, etc.

This basically causes problems with the left-right soundstage.

You can technically aim the tweeter at the listener in the sweet spot (the ideal listening area) to help mitigate this, but the problem is any listeners off axis would then experience lesser audio quality as a result.

Center speakers bypass this crossover issue common with horizontally aligned speakers by implementing a WTW (woofer, tweeter, woofer) design.

This ensures that listeners in the middle, and off to the side, experience the same high quality audio by dispersing sound evenly in the horizontal plane.

So long story short, while you can use a single bookshelf speaker, I would recommend leaving it standing up vertically rather than laying it down.

As a sidenote, make sure you set your speakers to small in the receiver settings rather than large.

Large is typically better suited for speakers with driver sizes of 6.25 inches and up.

Setting it to small and to 80hz ensures proper crossover with your subwoofer giving a better blending of sound across the frequency range.

 

 

Using Two Bookshelf Speakers as a Center Channel


Now what about the original question, can you use 2 of them instead of just 1?

Honestly I’d advise against it.

The problem that arises when you use 2 bookshelf speakers rather than 1 is sound cancellation can occur due to what’s known as lobbing and comb filtering.

These are basically time delays in the frequency range caused from 2 drivers radiating those same exact frequencies.

Using 2 speakers for this application would simply cause issues with nulls and boundaries around the room.

This collocation of the same speakers would also only raise the the dB output by 3 at most, and would simply do more harm than good.

A single speaker would have ever so slightly less output, but would sound much better overall.

You could technically run them in series or in parallel depending on their ohm load and the capabilities of your receiver, but you would still likely encounter the same problem when doing so.



Is a Bookshelf Speaker Or Dedicated Center Channel Speaker Better?


But if you have the option of both, is a dedicated center channel or a bookshelf the better choice?

Not to sound cliché but it depends.

Hypothetically speaking, because of the fact the traditional center has 2 bass drivers rather than 1, it’s likely to have better output in certain lower frequency ranges than the bookshelf will.

That’s not a guarantee since it really depends on the speaker, but since center speakers are generally bigger, they’re often capable of more.

However that sentiment changes when using floor standing speakers because in that case, there’s a decent chance that those could be better.

Using 3 of the same speaker would have the additional advantage of the most accurate timbre matching which could portray things like voices and dialogue more realistically.

But like I always say, your room type holds a massive bearing on how any of this truly shakes out.

Really it’s going to be down to preference because there’s so many factors that it really could go either way.

The only way to definitively know is to test for yourself since the same speaker could sound different in 2 different rooms. 



Can You Skip Using A Center Channel Speaker All Together?


But what if you wanted to enjoy home theater without a center channel — could you just skip one all together and opt for a 2.1 channel setup?

Funnily enough you actually can.

This is called running a phantom center, and what happens in this case is your mains in the front will take over and replicate the same sounds that the missing speaker would be originally tasked with.

A lot of modern receivers have this virtual center feature and balances volume between the left & right channels to provide convincing spatial imaging.

While you would lose some imaging with this particular usage of stereo sound if you sat off to the side, it wouldn’t be so bad to the point where it’s unlistenable.

The main advantage with using a dedicated physical one though is a wider sweet spot in terms of listening area.

For music it’s perfectly fine to forgo one, but for movies I would still personally recommend a center channel.

 

Final Thoughts


Hopefully this answers your original question regarding using 2 speakers for one center channel.

In short, it’s not a good idea, since it can cause issues with sound waves cancelling each other out.

It’s better to either simply use 1 orientated vertically, or use a traditional center channel speaker.

Anyway since that does it for this one.

Leave a comment below if you have any questions about anything or if there’s something I missed.

Until next time.

Make it easy, keep it simple. 😉

 

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