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5

ACOUSTIC CONSIDERATIONS

The acoustics of the room have a major 

influence on the overall performance of any 

audio system in a home cinema installation.  

Reflections off walls and ceilings, slap echo 

and uncontrollable bass can all be detrimental 

to the overall clarity and intelligibility of 

the audio system and therefore the overall 

enjoyment for the listeners.
A room with mostly hard surfaces and glass 

can sound too “lively” with a reverberation 

time which is often excessively long. In such 

environments, the dialogue and soundtrack 

in  general  can  lack  definition  and  clarity.  

Conversely, a room which has an excess of 

heavy acoustic treatment around every wall 

can sound flat and unnaturally dead.

The ideal scenario is to create a balance 

between absorption and diffusion by 

adding sufficient soft material to reduce the 

reverberation time of the space. Untreated, 

hard surfaces adjacent to the loudspeakers 

are not ideal. Placing bass traps in appropriate 

positions within the home cinema can help 

to moderate bass response variations and will 

result in a more defined bass that is realistic, 

particularly when listening to sound effects 

like gun shots or explosions.
It is highly recommended when designing 

a dedicated home cinema that you consult 

with an acoustic engineer to assist with the 

acoustic treatment of the space.  Some 

manufacturers of acoustic treatments offer a 

design service when using their products.  A 

detailed plan of the room with all dimensions 

is required, which should also include the 

seating layout and speaker positions.
Below is a link to an article written by acoustic 

engineer Andrew Steel, with some hints on 

acoustically treating a home cinema room 

and some general tips for room isolation.

Note:- 

  Sound  proofing  or  isolation  is  very 

different to acoustically treating a room.  It is 

a common mistake to concentrate on room 

isolation and not consider room acoustics.

http://www.krix.com.au/acoustictreatment/

Содержание MX20

Страница 1: ...SERIES MX INSTALLATION MANUAL ...

Страница 2: ...x CONTENTS 2 INTRODUCTION 3 ROOM SUITABILITY 4 ACOUSTIC CONSIDERATIONS 5 ROOM SIZE 6 AMPLIFICATION 7 SYSTEM DIMENSIONS 8 SYSTEM POSITIONING 9 SCREEN WALL CONSTRUCTION 10 SUBWOOFER SETUP AND CONFIGURATION 12 WIRING 13 EQUALISATION 14 ...

Страница 3: ...ry Both the infinite baffle wall and horn design technologies have been successfully combinedinourSeriesMXrangeofdedicated home cinema loudspeaker systems They are designed to be flush mounted into a false wall with an acoustically transparent screen placed over the front replicating the concept of a commercial cinema The Series MX modular systems feature the left centre and right screen loudspeak...

Страница 4: ...r more details Due to the capability of higher SPL s than typical home entertainment systems it is recommended that allowances are made in the room design and construction for sound proofing or isolation Sound isolation is generally required to reduce or eliminate extraneous noises eg traffic noise from the street outside or internal plumbing entering the home cinema and disturbing the soft passag...

Страница 5: ...d hard surfaces adjacent to the loudspeakers are not ideal Placing bass traps in appropriate positions within the home cinema can help to moderate bass response variations and will result in a more defined bass that is realistic particularly when listening to sound effects like gun shots or explosions It is highly recommended when designing a dedicated home cinema that you consult with an acoustic...

Страница 6: ...lly considered if the desired Dolby reference level is to be achieved The Series MX loudspeaker systems have been designed to suit a range of room sizes to best deliver a true cinematic experience Taking into account the average number of seats each room size can accommodate the table below illustrates the ideal room size range for each Series MX screen speaker system Note The Series MX system sho...

Страница 7: ...ne AV receiver Separate power amplifiers including ones with multiple channels have the capability to deliver more current and therefore produce the dynamics and impact desired for a true cinematic experience As the subwoofers in the Series MX systems are passive not self powered an independent power amplifier connected to the LFE channel s of the AV receiver processor is required to power these u...

Страница 8: ...stereo separation The tables in Figures 2 4 show the overall dimensions along with recommended cavity size for each MX system Use these dimensions as a guide to match up to your selected screen size Room Screen wall Cavity for MX system Room Screen wall MX system Screen System System Width System Height System Depth Cavity Width Cavity Height Cavity Depth MX20 2210 mm 1220 mm 295 mm 2260 mm 1270 m...

Страница 9: ...10 degrees of the listening axis of the speaker 500mm from base of speaker module For secondary viewing rows it is recommended to keep this angle within 20 degrees Care should also be taken to ensure the first row of viewers do not obstruct the sound path for viewers behind them Raising the platform height for subsequent rows can help to alleviate these issues System Spacer Width System Width Syst...

Страница 10: ...and alone screen wall This particular technique is outlined under the section Isolated from rear wall Fixed directly to rear wall Using this construction method the shelf studwork supporting the MX modules is fixed securely with construction adhesive in conjunction with screws or nails to the baffle wall and also to the rear wall of the adjoining room 1 Fix the cavity frame to the rear wall Figure...

Страница 11: ...s wall to the floor and the ceiling Figure 10 Where possible fill cavity with bulk insulation and then line the frame with plasterboard or other sheeting 2 Erect a frame for the screen wall and fix this to the floor ceiling and adjoining walls Figure 11 3 Fix noggins in between frames so that plasterboard or engineered timber board can be fixed Figure 12 At this point it is recommended to insulate...

Страница 12: ...ono configuration It is strongly recommended to run separate cabling for all channels in the MX modular loudspeaker system back to the central amplifier rack to permit future flexibility with the wiring configuration Outputs 1 INDIVIDUAL CHANNEL Stereo Power amplifier 2 8 Ohm load on the amplifier Outputs 1 BRIDGED PARALLEL Stereo Power amplifier 2 4 Ohm load on the amplifier Output 1 PARALLEL Mon...

Страница 13: ...e the use of high quality flexible multi stranded copper cables of suitable gauge are recommended for best performance For cable runs up to 10m in length a minimum 14AWG gauge cable should be specified for the main left main centre and main right loudspeakers and at least 12AWG cable for the subwoofers For longer cable runs consider using thicker cable If in doubt consult your Krix authorised deal...

Страница 14: ...riven on program peaks the use of an effective soft limiter will protect the loudspeaker driver against clipping damage and will also reduce the incidence of adverse distortion when the amplifier is faced with signals in excess of its peak rating High pass filter The MX subwoofer can benefit from the use of an appropriately selected high pass filter By filtering out the subsonic frequencies the ov...

Страница 15: ...hich can sound too bright forward and harsh in an average home cinema environment Some also pull too much energy out of the mid bass region resulting in a thin sounding system that lacks warmth and weight Listen for these issues when evaluating the results of an automated room correction system Manual Graphic Equalisation Manual graphic equalisation allows for a gentler equalisation curve to be ap...

Страница 16: ...krix com Krix Loudspeakers Pty Ltd 14 Chapman Road Hackham SA 5163 Australia T 61 8 8384 3433 F 61 8 8384 3419 listen krix com Rev 01 ...

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