Copyright 2008 BG Radia Copyright 2008 BG Radia 11

THX Ultra 2 certifiedTHX Ultra 2 certifiedBGX- 4850 and THX Select BGX- 4850 and THX Select

BGX-2450 In-wall BGX-2450 In-wall Subwoofer SystemsSubwoofer Systems

Exclusive breakthrough in subwoofer Exclusive breakthrough in subwoofer technology for custom installationtechnology for custom installation

22Copyright 2008 BG Radia Copyright 2008 BG Radia

Advantages of in-wall subwoofers over Advantages of in-wall subwoofers over traditional freestanding box substraditional freestanding box subs

they are “invisible”they are “invisible”do not occupy space in a roomdo not occupy space in a roomallow great flexibility in system and listening room designallow great flexibility in system and listening room design

Problems with in-wall subwoofersProblems with in-wall subwoofers

most in-wall subs generate high levels of structural most in-wall subs generate high levels of structural vibrations vibrations

the ones that generate less vibrations have limited the ones that generate less vibrations have limited dynamic and frequency range dynamic and frequency range

33Copyright 2008 BG Radia Copyright 2008 BG Radia

Existing In-wall Subwoofer ConceptsExisting In-wall Subwoofer Concepts

ProblemsProblems- back box is not sufficiently rigid and leaks airborne LF energy back box is not sufficiently rigid and leaks airborne LF energy - substantial LF energy transmission to nearby structural members and leakage into adjacent roomssubstantial LF energy transmission to nearby structural members and leakage into adjacent rooms- potential damage to structures if repeatedly operated at high levelspotential damage to structures if repeatedly operated at high levels- noise transmitted from vibrating structures degrades bass qualitynoise transmitted from vibrating structures degrades bass quality

Wall studs

Subwoofer A – traditional design, no vibration- Subwoofer A – traditional design, no vibration- reducing featuresreducing features

Adjacent

room

Listening

room

Back box

44Copyright 2008 BG Radia Copyright 2008 BG Radia

ProblemsProblems- back box is not sufficiently rigid and leaks airborne LF energy back box is not sufficiently rigid and leaks airborne LF energy - only partial vibration reductiononly partial vibration reduction a true active vibration suppression is expensive, complex and requires motional feedback data analysis and precise tuning. A simple shaker with a true active vibration suppression is expensive, complex and requires motional feedback data analysis and precise tuning. A simple shaker with

out-of-phase action helps to reduce structure-borne vibrations but only by about 10dB (as claimed) out-of-phase action helps to reduce structure-borne vibrations but only by about 10dB (as claimed) - - shaker requires additional amplifier power and presents a complex load unrelated to sound reproduction shaker requires additional amplifier power and presents a complex load unrelated to sound reproduction- LF energy leakage in adjacent rooms is still presentLF energy leakage in adjacent rooms is still present- possible damage to structures if repeatedly operated at very high levels possible damage to structures if repeatedly operated at very high levels - transmitted noise would still be high enough to degrade bass qualitytransmitted noise would still be high enough to degrade bass quality

Subwoofer B – features additional “shaker” counteractingSubwoofer B – features additional “shaker” counteractingstructural vibrations generated by woofers on the front panelstructural vibrations generated by woofers on the front panel

Wall studs

Woofers

Electro-mechanical transducer –”shaker”

Adjacent

room

Listening

room

Back box

55Copyright 2008 BG Radia Copyright 2008 BG Radia

Subwoofer C – woofer axis is parallel to supporting panels and joistsSubwoofer C – woofer axis is parallel to supporting panels and joists

Wall studs

Back box

Frontal chamber

Problems:Problems:- back box is not sufficiently rigid and leaks airborne LF energy as all previous designs back box is not sufficiently rigid and leaks airborne LF energy as all previous designs - dynamic range is limited due to limited woofer cone area dynamic range is limited due to limited woofer cone area - complex oblong woofer design leads to reduction of suspension linearity and stabilitycomplex oblong woofer design leads to reduction of suspension linearity and stability- vertical orientation of woofer axis simply results in a different direction of excitationvertical orientation of woofer axis simply results in a different direction of excitation ( Z –direction, not unlike an earthquake) and although wall vibrations are reduced compressive stress generates wall bending modes anyway ( Z –direction, not unlike an earthquake) and although wall vibrations are reduced compressive stress generates wall bending modes anyway And still results in: And still results in: - LF energy leakage in adjacent roomsLF energy leakage in adjacent rooms- possible damage to structures if repeatedly operated at very high levels possible damage to structures if repeatedly operated at very high levels - transmitted noise would still be high enough to degrade bass qualitytransmitted noise would still be high enough to degrade bass quality

Adjacent

room

Listening

room

66Copyright 2008 BG Radia Copyright 2008 BG Radia

Subwoofer D – two woofers face each other with axes verticalSubwoofer D – two woofers face each other with axes vertical and parallel to supporting panels and joists and parallel to supporting panels and joists

AdvantagesAdvantages- structure-borne vibrations are significantly reduced because woofers vibrate opposing each otherstructure-borne vibrations are significantly reduced because woofers vibrate opposing each other- there is no threat of structural damagethere is no threat of structural damage Problems:Problems:- enclosure is not sufficiently rigid and leaks airborne LF energy as all previous designs enclosure is not sufficiently rigid and leaks airborne LF energy as all previous designs - dynamic range is limited due to limited woofer cone area dynamic range is limited due to limited woofer cone area - complex woofer construction complex woofer construction - oblong form factor leads to reduction of woofer suspension linearity and stabilityoblong form factor leads to reduction of woofer suspension linearity and stability

Wall studs

Woofer enclosure

Frontal chamber

Woofer enclosure

Adjacent

room

Listening

room

77Copyright 2008 BG Radia Copyright 2008 BG Radia

THX certified BGX-2450/4580 subwooferTHX certified BGX-2450/4580 subwoofer

Heart of the system – an extra Heart of the system – an extra linear long-throw linear long-throw 44” woofer ” woofer coupled to glass- coupled to glass-reinforced enclosure in reinforced enclosure in multiple points comprising multiple points comprising a rigid monolithic structure.a rigid monolithic structure.

Such an enclosure does Such an enclosure does

not exhibit any structural not exhibit any structural resonances in woofer’s resonances in woofer’s operating range thus operating range thus providing maximum sound providing maximum sound isolation from internal isolation from internal airborne vibrations. airborne vibrations.

mitigates problems of in-wall designsmitigates problems of in-wall designsand opens new era of architectural audioand opens new era of architectural audio

Long gap high linearity motor with

Neodymium magnet

Ultra-linear suspension with elliptical rubber

surround

Coupling rod - creates

monolithic structure

Rigid compact

enclosure

Motor is rigidly encapsulated in woofer chassis

Extremely stiff composite

cone

88Copyright 2008 BG Radia Copyright 2008 BG Radia

If a rigid structure is subjected to opposing If a rigid structure is subjected to opposing and equal forces then according to and equal forces then according to Newton’s third law and principle of motion Newton’s third law and principle of motion the resulting force would be zero and the the resulting force would be zero and the structure would not vibrate.structure would not vibrate.

Correct implementation of vibration cancelling principleCorrect implementation of vibration cancelling principle

Rigorous manufacturing Rigorous manufacturing process and QC insures process and QC insures precise match of both precise match of both woofers to achieve woofers to achieve maximum vibration maximum vibration cancellation at high levelscancellation at high levels

Radia BGX subwoofers use a Radia BGX subwoofers use a unique combination of two unique combination of two opposing woofer/enclosure opposing woofer/enclosure assemblies coupled in a truly assemblies coupled in a truly force-cancelling configuration force-cancelling configuration

Two opposing forces acting on rigid structure

cancel each other

99Copyright 2008 BG Radia Copyright 2008 BG Radia

We got rid of bad structural and airborne vibrations…We got rid of bad structural and airborne vibrations…

The answer is to build a line array of The answer is to build a line array of woofer pair elements !woofer pair elements !

Now we need to provide sufficient air volume displacementNow we need to provide sufficient air volume displacementto achieve dynamic range required for a high performance system that to achieve dynamic range required for a high performance system that

meets THX Ultra 2 specifications – we need large total cone areameets THX Ultra 2 specifications – we need large total cone area

This combination of 12 x 4” woofers has larger cone area than a 12” woofer but unlike the woofer, it fits in a standard 14.5” wall cavity with 2x4 studs!

The result is a 26” long woofer line array The result is a 26” long woofer line array radiating sound through the front slot radiating sound through the front slot

4”

26”

12.75”

1010Copyright 2008 BG Radia Copyright 2008 BG Radia

Retrofit installationRetrofit installation

BGX-4850 has two installation options and two grille kits for BGX-4850 has two installation options and two grille kits for the most flexible, installer-friendly in-wall subwoofer systemthe most flexible, installer-friendly in-wall subwoofer system

mounting bracket is mounting bracket is installed between studs installed between studs in a 14 3/8” x 26 3/8” wall in a 14 3/8” x 26 3/8” wall

cut-outcut-out

subwoofer module drops insubwoofer module drops in - grille is installed using magnetic - grille is installed using magnetic retention feature without a need retention feature without a need for toolsfor tools- no drywall patching is required- no drywall patching is required

1.25”15.2”

1111Copyright 2008 BG Radia Copyright 2008 BG Radia

New construction installationNew construction installation

- new construction bracket - new construction bracket is pre-installed firstis pre-installed first

- subwoofer module is - subwoofer module is installed nextinstalled next

factory pre-assembled grille factory pre-assembled grille snaps on easily using imbedded snaps on easily using imbedded

magnetic bars magnetic bars

metal bezel is easily installed metal bezel is easily installed after drywall workafter drywall work

Top section view 11/16”7”

1212Copyright 2008 BG Radia Copyright 2008 BG Radia

THX Select BGX – 2450 systemTHX Select BGX – 2450 system

Subwoofer configurationsSubwoofer configurations

THX Ultra 2 BGX – 4850 systemTHX Ultra 2 BGX – 4850 system

2 x1200 W amplifier with class-D digital 2 x1200 W amplifier with class-D digital power modules, EQ and comprehensive power modules, EQ and comprehensive system overload protectionsystem overload protection

2 x BGX-2450 subwoofer modules2 x BGX-2450 subwoofer modules

with total woofer cone area with total woofer cone area exceeding 2 x 12” woofersexceeding 2 x 12” woofers

2 x 1200 W amplifier class-D digital 2 x 1200 W amplifier class-D digital power modules, EQ and comprehensive power modules, EQ and comprehensive system overload protectionsystem overload protection

4 x BGX-2450 subwoofer modules 4 x BGX-2450 subwoofer modules with total cone area equivalent to with total cone area equivalent to 2 x 18” woofers2 x 18” woofers

provides THX Select performance provides THX Select performance in small to medium size rooms up in small to medium size rooms up toto

2000-2500 cu.ft.2000-2500 cu.ft.

provides THX Ultra 2 performance provides THX Ultra 2 performance in medium to large size rooms in medium to large size rooms above 2500 cu.ft.above 2500 cu.ft.

1313Copyright 2008 BG Radia Copyright 2008 BG Radia

BGX-2450 and BGX-4850 offer amazing system design flexibility BGX-2450 and BGX-4850 offer amazing system design flexibility and options previously unavailable for custom installersand options previously unavailable for custom installers

One of many possible front-end system configurations for medium size roomsOne of many possible front-end system configurations for medium size rooms

Screen

Radia R320i

Radia R320i Radia R320i

Radia BGX-2450

Radia BGX-2450

You can build a high-end system with in-wall speakers AND You can build a high-end system with in-wall speakers AND

subwoofer combined into a system with 7” wide grilles!subwoofer combined into a system with 7” wide grilles!

7”7”

1414Copyright 2008 BG Radia Copyright 2008 BG Radia

virtually invisible in-wall (in-ceiling) concept frees room floor spacevirtually invisible in-wall (in-ceiling) concept frees room floor space

lifestyle, interior design friendly, stealth and sleek look, paintable grilleslifestyle, interior design friendly, stealth and sleek look, paintable grilles

innovative vibration cancelling design does not affect house structures and innovative vibration cancelling design does not affect house structures and insures trouble-free application even at extreme playback levelsinsures trouble-free application even at extreme playback levels

does not leak bass energy into adjacent rooms, provides high comfort level does not leak bass energy into adjacent rooms, provides high comfort level throughout the housethroughout the house

easy to install modular design with factory preassembled grilleseasy to install modular design with factory preassembled grilles

THX Ultra 2 or THX Select performanceTHX Ultra 2 or THX Select performance

designed and made in USA from premium grade components and materialsdesigned and made in USA from premium grade components and materials

BG Radia THX certified subwoofer systems provide combination of BG Radia THX certified subwoofer systems provide combination of features not available from ANY other subwoofer on the marketfeatures not available from ANY other subwoofer on the market