Home Theater Setup: The Complete Guide

A home theater is a receiver, five to seven speakers, a subwoofer, and a set of angles that Dolby publishes and most people ignore. Get the layout right and modest equipment sounds coherent. Get it wrong and expensive equipment does not.

Start here: what you actually need

A 5.1 system is the baseline: front left, centre, front right, two surrounds, and a subwoofer. That is what almost all film soundtracks are mixed for, and it is a complete, finished system — not a stepping stone.

The numbers describe the layout. In “5.1.2”, the first number is the ear-level speakers, the second is subwoofers, and the third is height speakers for Dolby Atmos. So 5.1.2 is a 5.1 system plus two height channels.

Buy channels before you buy quality. A complete 5.1 of modest speakers beats an incomplete 2.0 of expensive ones for film, because the centre channel carries most of the dialogue and without it your dialogue is a phantom image that collapses the moment you sit off-axis.

The angles, from Dolby's published specification

These are not our recommendations. They are the layout Dolby publishes, and the reason your receiver’s setup menu asks the questions it does.

The reference for all of this is Dolby’s own published speaker setup guidance, linked in the sources below. If a page tells you a different number without citing a source, ask where it came from. The height-channel angles are covered in detail here.

Why the centre channel is the one that matters

In a typical film mix, the large majority of dialogue is in the centre channel. That is what it is for.

Without one, your receiver creates a phantom centre by sending the signal to both front speakers. It works — if you sit exactly in the middle. Move one seat over and the dialogue moves with you, because the nearer speaker arrives first. On a sofa with three seats, two of them are wrong.

This is why a 5.1 of cheap speakers beats a 2.0 of good ones for film, and it is the single highest-value thing on this page.

Subwoofer placement: the crawl

Bass below about 80 Hz is very hard to localise, which is why one subwoofer works. But where you put it changes the response enormously, because room modes create positions where bass piles up and positions where it cancels.

You cannot calculate your way out of this — it depends on your room’s exact dimensions and construction. So do the subwoofer crawl instead:

1. Put the subwoofer on your listening seat.
2. Play something with continuous, repetitive bass.
3. Crawl around the floor at the positions where the subwoofer could go.
4. Where it sounds most even — not loudest — is where it goes.

It looks ridiculous and it works, because it exploits acoustic reciprocity: a path from the sub to your ear behaves the same as the reverse. It costs nothing, and it will do more for your bass than any upgrade at this budget.

Set the crossover at 80 Hz and stop thinking about it

The crossover decides where bass stops going to your speakers and starts going to the subwoofer. 80 Hz is the standard, and it is standard for a good reason: it is low enough to be below localisation for most people, and high enough to relieve small speakers of the work they are worst at.

Set your speakers to “Small” in the receiver menu even if they are large. That setting does not describe the cabinet — it tells the receiver to send bass to the subwoofer, which is what you want. An ELAC Debut B6.2 reaches 44 Hz on its own; a subwoofer does that better and frees the ELAC’s woofer to do everything else.

Run the room correction. Then check it

Every receiver we recommend has room correction: Audyssey MultEQ XT on the Denon AVR-X1800H, plain Audyssey MultEQ on the AVR-S670H and Marantz Cinema 70s, YPAO on the Yamahas, AccuEQ on the Onkyo.

Run it. It measures with a microphone and corrects for the room, and it is the single most effective feature on the box — more than any power figure.

Then check what it did. These systems set speaker distances and levels as well as EQ, and if it has decided a speaker is 30 feet away when it is 10, something was wrong with the measurement. Room correction is very good at frequency response and only adequate at bass below about 80 Hz, where the problem is physical rather than electrical — which is what room treatment is actually for.

What the receiver spec sheet will and will not tell you

Two things worth knowing before you buy, both from our receiver roundup:

Power figures are rated with two channels driven. Denon publishes 80 W + 80 W for the AVR-X1800H at 8 Ω, 20 Hz–20 kHz, 0.08% THD — with 2 channels driven. A 7-channel action scene drives seven. Nobody publishes an all-channels-driven figure at this price, so the honest position is that the real number is lower and unknown.

Pre-outs decide whether you can ever upgrade. The Denon AVR-X1800H has 2.2 pre-outs; the AVR-S670H has subwoofer outputs only; the Marantz Cinema 70s has a full 7.2. If you ever want to add an external power amplifier, that spec is the ceiling, and almost nobody mentions it.

The order to spend money in

1. A complete channel count — 5.1 before anything else.
2. A subwoofer, placed by crawl — free performance.
3. Room correction, run properly — already in the box.
4. Room treatment — cheaper than any electronics upgrade and it fixes problems electronics cannot.
5. Better speakers — last, not first.

That order is close to the reverse of how most people spend, which is why most home theaters underperform their price.