The Top 7 Mistakes For Home Theatres

When designing your own home theatre, careful consideration should be given to; lighting, acoustics, speaker types and positioning, screen size, screen type and material, projector type and the control system.

1. Home Theatre Lighting

Two specific types of lighting require careful consideration in the design of your theatre. These are natural lighting and artificial lighting.

Natural light: Ideally, no natural light should be present in the theatre space. When blinds or drapes are installed in the theatre space, they must be made of heavy material such as velvet or upholstery fabric which will completely block the natural light. Make sure the fabric has a separate two or three pass coated backing to guarantee block out even in full sunlight. When fitting the drapes, it is imperative that there is no light spill. Where light spill is present, it will reflect off the backing of the drapes and a bright area will be present at the top, sides and bottom of the drapes. This in turn will affect the contrast and brightness of the image which will detract from the viewing experience within the theatre.

Artificial Light: Artificial light is essential in creating specific light scenes and task lighting within the theatre and also for producing ambience or a specific look, feel or tone.

A few artificial lighting tips worth considering are:

Avoid direct light shining onto your projection screen or into the theatre space
Consider using coloured light rather than just white light to enhance the look of the theatre space
Ensure you have a light source within the theatre which will provide sufficient light for cleaning and equipment maintenance
Make sure you cannot see the light source in your light fittings as this will create glare
Check that the theatre light fittings do not impact or interfere with the projected image on the screen. Pendant lights or any hanging lights if within the projection sight lines will create a silhouette on the projection screen itself.
Do not point any of the light fittings back toward the seated positions. As per the point above, this will create glare and make the theatre experience uncomfortable for the participants.
Ensure that none of the light fittings have light spill.
Make sure the lighting can be controlled via a control pad such as an ipad or universal remote as this will save many trips to the light switch and make the entire movie viewing experience more pleasurable
2. Home Theatre Acoustics

Anyone can add some speakers into a space and make it loud. It takes careful consideration to make a theatre space sound “exceptional.” There are some simple and relatively easy design steps to help a theatre space work well acoustically. Parallel surfaces provide an ideal environment for reflections to precipitate. Where possible, install carpet as this will not only enhance the acoustics but it will provide a plush theatre feel. Make sure the carpet is installed on a high quality underlay and avoid laying the carpet directly onto the existing timber or concrete floor. A simple but effective way to promote good quality sound is to construct some fabric panels which can be mounted to the walls. Also pay particular attention to speaker placement.

3. Home Theatre Speakers

Almost any quality speaker is capable of reproducing effects however, the primary intended use of the speaker type is the most important aspect. A home theatre will usually have surround sound. When understanding surround sound terminology, the ‘.1’ refers to the sub bass output. 5.1 surround is five speakers and a sub bass.

Front centre speaker: As this speaker presents predominantly speech and dialogue, it is imperative that it is located at or very near to the centre of the screen or display.

Front left and right speakers: When setting up a stereo speaker system, the front left and right speakers should be placed as far apart as possible in order to achieve left and right channel separation, thus improving the stereo effect.

Surround left and right speakers: These speakers are the ones which suffer from misplacement the most often. The surround speakers should be placed o the left and right of your seated position, not behind.

Rear surround speakers: The rear surround speaker or speakers (6.1 or 7.1 surround) are placed further back behind the surround speakers or possibly mounted at the rear of the theatre.

Sub bass speaker: The sub bass adds another dimension to the home theatre audio experience in providing that “earth shattering” bass sound that we all love to hear at the movies. The concept of having a sub bass is to actually enhance the sound in the theatre space to provide an even frequency response across the full audible spectrum. Select a sub bass speaker , as large as you can afford, 10 or 12 ” is suitable.

4. Screen Size

Screen size is one instance where bigger isn’t always better. In the room which will become your theatre mark the front wall with some masking tape indicating the size (width, height and corners) of the screen you would like to have. Move back to where you would be seated in your theatre and see if you can see the tape in you field of view. A 100” projection screen has the following dimensions:16:9 aspect ratio has an image size of 2214mm wide x 1245mm high, diagonal is 2540mm.4:3 aspect ratio: has an image size of 2032mm wide x 1524mm high, diagonal is 2540mm. Today, new content is generated in at least 16:9 (1.78:1) aspect ratio. Many DVDs and Bluray discs are produced in 2.35:1 (CinemaScope, Panavision, Super widescreen

5. Projector Type And Specification

Six considerations are always paramount when considering the type and brand of projector to use in a home theatre. These are, in no specific order: cost, resolution, type (LCD, DLP, LCOS/DiLA) brightness, fit and 3D or not 3D

Cost: Generally the more you spend, the more you will get, but working out the other five considerations will generally dictate where you sit with this point.

Resolution: The higher the resolution, the better the image will look in regard to detail and image clarity. As a rule, full high definition would be the minimum requirement for a theatre as you are presenting a large image and at lower resolutions, the pixels (image elements) will be visible. This is not always so obvious on a smaller image, but as the image increases in size, the pixels (image elements) become more visible.

Type: LCD projection technology has been developing for a long period of time and is now very mature. Generally, liquid crystal display (LCD) projectors are cost effective with good light output and contrast ratio.

DLP projection technology was developed to improve the energy efficiency of projectors and also the contrast ratio and resolution. Three chip DLP projectors are ideal for home theatre use but tend to be more expensive than their LCD counterparts and also tend to be lower brightness. Their contrast ratio is however, incredibly high.

LCOS/DiLA is probably the pick for home theatre, but it is also one of the most expensive technologies. It offers very ‘film like’ projected images and extremely good contrast ratio and allows higher light output.

Brightness: Most manufacturers offer a range of projectors varying in resolution and brightness. The larger the image, the more light output you will need, however, a 110” image in a completely darkened theatre room may require as little as 1100 ANSI lumens to produce a high contrast dynamic image. 2400 ANSI lumens will do the same but allow some lighting in the theatre during the movie. Generally more light output would only be required if the image size is very large or the projector is to run in ‘economy’ mode. If the projector is too bright, it will be difficult to watch.

Fit: The projector must be able to operate in the space it is intended. That is, the optics of the projector must allow the projector to be suitably located within the theatre space and to allow the optics of the projector to be set correctly. Avoid at all costs digital keystone correction as this function will square your image up on screen but has the adverse effect of reducing the available pixel count effectively reducing the resolution. If the projector has optical lens shift, this can assist in allowing the projector to be suitably positioned. The projector should be located above or behind the rear most seating position so that you cannot see the projector and so that you are less likely to hear any fan noise. The projector lens throw should be examined closely to guarantee the projector position is correct.

3D or not 3D: Many newer projectors are capable of 3D projection and offer an excellent 3D viewing experience. As with sitting too close to a large screen, 3D viewing is physically tiring so make sure this is the secondary viewing method and not the first. In reality, less than 5% of the movies you watch will be in 3D so make 3D operation an ‘extra’ nice to have.

6. Screen Type And Material

The screen and screen material is just as important as the projector itself and must be suited to the application, projector and environment

Screen Material: Don’t be tempted to buy the cheapest screen you find on eBay. You will get what you pay for and a little research will go a long way to improve the theatre viewing experience. Most reputable screen manufacturers produce screen materials for specific applications and are suited to particular projector types. For example, many theatre projectors are relatively low brightness but are capable of full high definition display with very good contrast ratio. The most suitable type of screen for this application may be a white screen which has gain to improve the apparent viewing brightness.

Screen Type: You will have the option of either fixed screen or motorised roller screen. The fixed screen is great in dedicated home theatres and when not in use, can be concealed behind a motorised curtain or similar. The down side to this type of screen is it is likely to receive damage if the theatre space is multi-purpose. If the theatre room doubles as a rumpus room, games room or other function, the screen will require to be motorised so that it can be retracted out of the way when not required.

Using a fixed screen is a lower cost alternative to a motorised screen where you know the screen will be safe and unlikely to be damaged. Fixed screens are available with micro-perforations which allow speakers to be placed behind out of view without detracting from the projected image or sound quality.

7. Control Of Equipment And Theatre Lighting

Control system technology has improved considerably in the last few years and has become more affordable for the home theatre environment. The key is to provide control of all essential devices within the theatre space. This may include heating and cooling within the theatre, control of motorised seating, lights and blinds and of course, the audio visual equipment itself. The control system most suitable for a theatre is a universal touch screen such as an ipad, ipad Mini or RTI touch screen

When this aspect is installed and operating, the next step is to sit back and enjoy your home theatre and movie experience.