1. Copyright 2008 BG Radia 1 THX Ultra 2 certified BGX- 4850 and THX Select BGX-2450 In-wall Subwoofer Systems Exclusive breakthrough in subwoofer technology for custom installation

2. 2Copyright 2008 BG Radia Advantages of in-wall subwoofers over traditional freestanding box subs they are “invisible” do not occupy space in a room allow great flexibility in system and listening room design Problems with in-wall subwoofers most in-wall subs generate high levels of structural vibrations the ones that generate less vibrations have limited dynamic and frequency range

3. 3Copyright 2008 BG Radia Existing In-wall Subwoofer Concepts Problems -back box is not sufficiently rigid and leaks airborne LF energy -substantial LF energy transmission to nearby structural members and leakage into adjacent rooms -potential damage to structures if repeatedly operated at high levels -noise transmitted from vibrating structures degrades bass quality Wall studs Subwoofer A – traditional design, no vibration- reducing features Adjacent room Listening room Back box

4. 4Copyright 2008 BG Radia Problems -back box is not sufficiently rigid and leaks airborne LF energy -only partial vibration reduction 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) 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) - shaker requires additional amplifier power and presents a complex load unrelated to sound reproduction -LF energy leakage in adjacent rooms is still present -possible damage to structures if repeatedly operated at very high levels -transmitted noise would still be high enough to degrade bass quality Subwoofer B – features additional “shaker” counteracting structural vibrations generated by woofers on the front panel Wall studs Woofers Electro- mechanical transducer – ”shaker” Adjacent room Listening room Back box

5. 5Copyright 2008 BG Radia Subwoofer C – woofer axis is parallel to supporting panels and joists Wall studs Back box Frontal chamber Problems: -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 -complex oblong woofer design leads to reduction of suspension linearity and stability -vertical 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 rooms -possible damage to structures if repeatedly operated at very high levels -transmitted noise would still be high enough to degrade bass quality Adjacent room Listening room

6. 6Copyright 2008 BG Radia Subwoofer D – two woofers face each other with axes vertical and parallel to supporting panels and joists and parallel to supporting panels and joists Advantages -structure-borne vibrations are significantly reduced because woofers vibrate opposing each other -there is no threat of structural damage Problems: -enclosure is not sufficiently rigid and leaks airborne LF energy as all previous designs -dynamic range is limited due to limited woofer cone area -complex woofer construction -oblong form factor leads to reduction of woofer suspension linearity and stability Wall studs Woofer enclosure Frontal chamber Woofer enclosure Adjacent room Listening room

7. 7Copyright 2008 BG Radia THX certified BGX-2450/4580 subwoofer Heart of the system – an extra linear long-throw 4” woofer coupled to glass-reinforced enclosure in multiple points comprising a rigid monolithic structure. Such an enclosure does not exhibit any structural resonances in woofer’s operating range thus providing maximum sound isolation from internal airborne vibrations. not exhibit any structural resonances in woofer’s operating range thus providing maximum sound isolation from internal airborne vibrations. mitigates problems of in-wall designs and 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

8. 8Copyright 2008 BG Radia If a rigid structure is subjected to opposing and equal forces then according to Newton’s third law and principle of motion the resulting force would be zero and the structure would not vibrate. If a rigid structure is subjected to opposing and equal forces then according to Newton’s third law and principle of motion the resulting force would be zero and the structure would not vibrate. Correct implementation of vibration cancelling principle Rigorous manufacturing process and QC insures precise match of both woofers to achieve maximum vibration cancellation at high levels Radia BGX subwoofers use a unique combination of two opposing woofer/enclosure assemblies coupled in a truly force-cancelling configuration Two opposing forces acting on rigid structure cancel each other

9. 9Copyright 2008 BG Radia We got rid of bad structural and airborne vibrations… The answer is to build a line array of woofer pair elements ! Now we need to provide sufficient air volume displacement to achieve dynamic range required for a high performance system that meets 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 radiating sound through the front slot 4” 26” 12.75”

10. 10Copyright 2008 BG Radia Retrofit installation BGX-4850 has two installation options and two grille kits for the most flexible, installer-friendly in-wall subwoofer system mounting bracket is installed between studs in a 14 3/8” x 26 3/8” wall cut-out subwoofer module drops in - grille is installed using magnetic retention feature without a need for tools - no drywall patching is required 1.25” 15.2”

11. 11Copyright 2008 BG Radia New construction installation - new construction bracket is pre-installed first - subwoofer module is installed next factory pre-assembled grille snaps on easily using imbedded magnetic bars metal bezel is easily installed after drywall work Top section view 11/16” 7”

12. 12Copyright 2008 BG Radia THX Select BGX – 2450 system Subwoofer configurations THX Ultra 2 BGX – 4850 system 2 x1200 W amplifier with class-D digital power modules, EQ and comprehensive system overload protection 2 x BGX-2450 subwoofer modules with total woofer cone area exceeding 2 x 12” woofers with total woofer cone area exceeding 2 x 12” woofers 2 x 1200 W amplifier class-D digital power modules, EQ and comprehensive system overload protection 4 x BGX-2450 subwoofer modules with total cone area equivalent to 2 x 18” woofers provides THX Select performance in small to medium size rooms up to 2000-2500 cu.ft. 2000-2500 cu.ft. provides THX Ultra 2 performance in medium to large size rooms above 2500 cu.ft.

13. 13Copyright 2008 BG Radia BGX-2450 and BGX-4850 offer amazing system design flexibility and options previously unavailable for custom installers One of many possible front-end system configurations for medium size rooms Screen Radia R320i Radia BGX- 2450 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”

14. 14Copyright 2008 BG Radia virtually invisible in-wall (in-ceiling) concept frees room floor space lifestyle, interior design friendly, stealth and sleek look, paintable grilles innovative vibration cancelling design does not affect house structures and insures trouble-free application even at extreme playback levels does not leak bass energy into adjacent rooms, provides high comfort level throughout the house easy to install modular design with factory preassembled grilles THX Ultra 2 or THX Select performance designed and made in USA from premium grade components and materials BG Radia THX certified subwoofer systems provide combination of features not available from ANY other subwoofer on the market