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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
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