3.1 vs 7.1 Soundbar: How Many Channels Do You Really Need?

What 3.1 and 7.1 name on a listing

On a soundbar listing, the number before the dot tells you how many speaker channels the layout names. 3.1 names three channels: left, right, and center. 7.1 names seven channels: left, right, center, two side, and two rear. The number after the dot, the 1, names a subwoofer channel. The seller is stating the channel layout, not a rating of how the bar sounds.

The layout number is the first thing to read on a listing because it tells you how many separate speaker positions the product names. A 2.0 bar has no center channel and no subwoofer channel; a 2.1 adds the subwoofer channel. The comparison here is between 3.1 and 7.1.

Some listings add a third number, such as 3.1.2 or 5.1.2, for height channels used with Dolby Atmos. Plain 3.1 and 7.1 as written here have only the first number and the subwoofer number. For a fuller explanation of how channel numbers read, see channel numbers.

The center channel in a 3.1 layout

In a 3.1 layout, the center channel is in the bar itself. The middle of the bar carries that channel. The title may not say 'center channel' because the 3 carries the meaning. A 3.1 listing is usually a single bar, sometimes with a subwoofer in the same box and sometimes with the subwoofer sold separately.

If the title says 3.1 and nothing else about a subwoofer, the .1 names a subwoofer channel, but the listing may not state whether the subwoofer is built in or a separate piece. The bullet list will usually confirm the bar's layout and whether a subwoofer is included. Read more about the center channel as a listing term in center channel dialogue.

Side and rear speakers in a 7.1 layout

A 7.1 layout adds four speakers around the listening position: two side and two rear. On a listing, these are often named 'rear speakers' or 'surround speakers,' sometimes with 'wireless' in front of them. The side speakers face to the sides of the listening position, and the rear speakers sit behind it. The word 'surround' is a common listing word that covers both.

A 7.1 title may be for the bar alone, or it may be a bundle that includes the side and rear speakers in one box. The word 'system' or 'home theater' in a title often signals that more than the bar is included. A 7.1 setup has more pieces to place in the room, so measure the floor space and decide where the side and rear speakers will sit before buying. The question of whether rear speakers are worth the extra pieces is covered in rear speakers worth it.

What each layout includes in the box

The box contents matter as much as the channel number on a listing. A 3.1 listing can be just the bar, or the bar plus a separate subwoofer. A 7.1 listing can be the bar alone, the bar with a subwoofer, or the full set with the side and rear speakers. The bullet list under the title tells you which pieces are included.

If the title says 'system' or 'home theater,' the seller usually means more than the bar. If the title names a subwoofer or rear speakers, those pieces are stated. When a listing does not name a piece, the catalogue does not state whether it is included. This site compares listings on stated details; the guides do not guess at unlisted pieces.

A 3.1 and a 7.1 listing can also be the same bar in different bundles: one sale lists the bar alone, another lists the bar with a subwoofer, and a third lists the bar with a subwoofer and rear speakers. The channel number stays the same; the bundle changes.

How to compare a 3.1 and a 7.1 listing

To compare the two layouts, start with the channel number in the title, then read the bullet list for which speakers come in the box. Check whether the subwoofer is built in or separate, and whether side and rear speakers are included or sold separately.

Check the connections: HDMI ARC or eARC, optical, and Bluetooth are the common terms on a listing. HDMI eARC is the connection that supports the most advanced audio formats; compare the two terms in HDMI ARC vs eARC. Bluetooth is a standard way to stream audio from a phone; the Bluetooth technology overview describes how the radio works. The HDMI specification overview describes the eARC features.

The catalogue has no data on how either layout sounds, so the comparison on this site is based on the stated channel count and included speakers only. For more on the connection terms, see connectivity options.

What the channel numbers do not tell you

A channel number states how many speakers the layout names, not how the product performs. This site has no data on loudness, bass depth, dialogue clarity, or surround effect. The catalogue does not list wattage, frequency response, driver size, or the room size a bar suits. To decide, compare the stated channel count and the pieces in the box, then read the maker's page for the details you need.

The channel number does not tell you whether the bar has Dolby Atmos, which is a separate format word on a listing. Read the title and bullet list for format words, and read the maker's page for the full feature list. For more comparisons of layouts, see 3.1 vs 5.1 and 5.1 vs 7.1. If a listing also carries Dolby Atmos, height channels are a separate question; see Dolby Atmos optional.

When you are ready to shortlist, start with the soundbar buying guide.

What to pick for your situation

Questions

Is a 7.1 soundbar better than a 3.1?

This site cannot judge better. 7.1 names more channels, including side and rear speakers. 3.1 names three front channels. Compare by the stated channel count and which speakers come in the box; the catalogue has no data on how either sounds.

Do I need rear speakers for a 3.1 bar?

A 3.1 layout does not include rear speakers. If the listing is for a 3.1 bar, the box will not contain side or rear speakers unless the title or bullet list says otherwise.

What does the .1 mean in 3.1 and 7.1?

The .1 names a subwoofer channel. Both 3.1 and 7.1 have one subwoofer channel. The listing may or may not state whether the subwoofer is built in or a separate piece.

Can a 7.1 bar work without rear speakers?

Some 7.1 listings are for the bar alone, and the rear speakers are sold separately or in a bundle. Check the bullet list and the maker's page to see which pieces are included.

Does a 3.1 bar have a center channel?

Yes, the 3 in 3.1 names left, right, and center channels. The center channel is in the bar itself.

Should I pick 3.1 for a bedroom TV?

The guide cannot say which layout suits a room. A 3.1 bar is one piece, which may be easier to place. A 7.1 setup has more speakers. Measure your space and decide from the stated details.