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RAY SUB RAY SUB TECHNOLOGY TECHNOLOGY

RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

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Page 1: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUB RAY SUB TECHNOLOGYTECHNOLOGY

Page 2: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

DIRECTIONAL DIRECTIONAL SUBWOOFERS SUBWOOFERS

BENEFITSBENEFITS

Page 3: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

Omnidirectional pattern:

Excessive low frequency level on stage (damages sound pick-up);

High reverberant level in indoor venues;

Environmental problems in outdoors venues.

Stereo Design:

“Power Alley” effect related to strong Left and Right interferences.

Eigen Modes:

In closed venues, room eigen modes (nulls and maximums) are dominant over source location.

f1=C/2L

L(m)

f1=C/2L

L(m)

DIRECTIONAL SUBWOOFERS

Page 4: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

p = p = 0

d

S1

in ( )

S2p1

p2p2

p1

=d/C

Directional Low Frequency Radiation

Gradient Subwoofer Block Diagram

DIRECTIONAL SUBWOOFERS

Page 5: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

Pressure results from front and rear generated pressures differences;

NX Controller algorithms allow up to 5 dB gain in the front zone, and 15 dB average attenuation in the rear zone (variable pattern);

Low Frequency Cut-off is determined when rear loudspeaker does not add gain in front zone; increases as cabinet depth decreases;

High Frequency Cut-off is determined when side lobes appear and on-axis level decreases; increases as cabinet depth decreases;

Usable Range: 2 to 3 octaves depending on cabinet architecture;

RS patent pending technology extends High Frequency cut-off and suppresses the Low Frequency cut-off through proper definition of radiating surfaces position and phase relationship.

Directional Low Frequency Radiation

DIRECTIONAL SUBWOOFERS

Page 6: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

Directional Low Frequency Radiation

Frequency (Hz)50 100 200

(dB) Level

0

-5

-10

-15

-20

-25

-30

5

10

O: Back Speaker O: Sum cardioRS15 On-Axis Gain: Rear (Red) – Front (Blue) - Rear+Front (Green)

DIRECTIONAL SUBWOOFERS

Page 7: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

Directional Low Frequency Radiation

2xRS15 Coverage and Response

DIRECTIONAL SUBWOOFERS

Page 8: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

To summarize:

Rear Radiation is lowered by more than 12 dB, which benefits to stage as well as to neighbours;

Direct to Reverberant ratio is increased by nearly 6 dB (which increases Sub impact in closed venues);

Beacuse of their directional behaviour, gradient subwoofers are less sensitive to room eigen modes.

DIRECTIONAL SUBWOOFERS

Directional Low Frequency Benefits

Page 9: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

DIRECTIONAL SUBWOOFER DIRECTIONAL SUBWOOFER ARRAY DESIGNARRAY DESIGN

Page 10: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

Issue:

Stereophony cannot apply to VLF systems installed 20 meters apart (doublet type interferences occur on all mono signals);

No universal rule applies, this is a case to case situations where various options must systematically be explored within implementation constraints;

Sub design is experimenting, and making the right compromise.

Directional sub array design rules:

Distance between subs should not be less than 0.5 meters (for proper rear to front enregy transfer), not more than 1.7 meters (so that line criteria is fulfilled up to 100 Hz)

Design is easier because consequences on stage are less

Choosing the right compromise

DIRECTIONAL SUB ARRAY DESIGN

Page 11: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

CENTER MONO SUB

Advantages

No Left/ Right interferences;

Coverage constancy when flown.

Drawbacks

Coverage consistancy when stacked;

Phase relation between Stereo system and center mono Sub.

DIRECTIONAL SUB ARRAY DESIGN

Stacked Center Sub

Flown Center Sub

Page 12: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

HORIZONTAL SUB ARRAY

Advantages

No Left/ Right interferences;

Coverage Control.

Drawbacks

Implementation;

« Hot Spot » on stage for Curved Arrays;

Phase relation between Main System and Horizontal Array.

Geometrically Curved Array

Electronically Curved Array

DIRECTIONAL SUB ARRAY DESIGN

Page 13: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

STEREO SUB DESIGN

DIRECTIONAL SUB ARRAY DESIGN

Interferences between Left and Right are related to coverage overlap;

Overlap has to be minimized, ie Left and Right coverage have to be as independent as possible;

When using few cabinets, directional subwoofers should be rotated 30° to 45° outwards;

Interference region is then limited to the center area.

Stereo Omnidirectional Subs

Stereo Directional Subs

Page 14: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

STEREO SUB ARRAY DESIGN

Procedure

Sub Array must be designed and experimented (one side only) to minimize overlap from one side to the other.

Advantages

Interference region is limited to the center area;

Phase relation between Main Stereo System and Sub Arrays is improved;

Drawbacks

« Power Alley » effect.

DIRECTIONAL SUB ARRAY DESIGN

Curved Sub Array – Left Implementation

Curved Sub Array – Left and Right Sum

Page 15: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

STEREO SUB ARRAY DESIGN

Procedure

Sub Array must be designed and experimented (one side only) to minimize overlap from one side to the other.

Advantages

Interference region is limited to the center area;

Phase relation between Main Stereo System and Sub Arrays is improved.

Drawbacks

« Power Alley » effect.

DIRECTIONAL SUB ARRAY DESIGN

Steered Sub Array – Left Implementation

Steered Sub Array – Left and Right Sum

Page 16: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs RAY SUBs IMPLEMENTATIONIMPLEMENTATION

Page 17: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs IMPLEMENTATION

OMNIDIRECTIONAL MODE

Omnidirectional mode should be favoured when:

Sufficient depth is not available for directional implementation

Strong rear radiation is not critical

Coverage is slightly narrower along RS’s width than height

RS15 horizontal coverage (omni mode)

RS15 vertical coverage (omni mode)

Page 18: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs IMPLEMENTATION

DIRECTIONAL MODE - SINGLE

Single RS15 horizontal coverage is:

Constant 120°@-3dB / 180°@-6dB

Tilted 30° off-axis;

Single RS15 vertical coverage is:

Constant 120°@-3dB / 180°@-6dB

Symmetrical.

In directional mode, no reflecting surface should be at less than 50cm from RS15’s walls

RS15 horizontal coverage (direct mode)

RS15 vertical coverage (direct mode)

Page 19: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs IMPLEMENTATION

DIRECTIONAL MODE - PAIRS

« BACK TO BACK » MODE

-3 dB Horizontal Coverage decreases from:

120° @ 31 Hz to

60° @ 100 Hz

- 3dB Vertical Coverage is constant 120°

2 RS15 « back to back » coverage

Page 20: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs IMPLEMENTATION

DIRECTIONAL MODE - PAIRS

« ALTERNATE MODE »

-3 dB Horizontal and Vertical Coverages are constant 120°

2 RS15 « alternate » coverage

Page 21: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs IMPLEMENTATION

DIRECTIONAL MODE - PAIRS

« FACE TO FACE » MODE

When set 50cm / 20’’ apart:

-3 dB Horizontal Coverage increases from:

120° @ 31 Hz to

180° @ 100 Hz

- 3dB Vertical Coverage is constant 120°

2 RS15 « face to face » coverage

Page 22: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

DIRECTIONAL MODE – VERTICAL COLUMNS

RAY SUBs IMPLEMENTATION

RS15s columns are always flown vertically (bumper at 0°, no angle between cabinets)

A 12 RS15 cluster flown at 10m / 30ft provides a +/-3 dB SPL deviation at 100Hz over 75m / 200ft while maintaining 15 to 20 dB attenuation on stage

12 RS15 « alternate » unsteered column coverage

Page 23: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RAY SUBs IMPLEMENTATION

DIRECTIONAL MODE – VERTICAL COLUMNS

RS15s columns can be steered electronically upwards or downwards

Minimum RS15 quantity for efficient control is 4

Coverage control increases with higher quantities

Beam steering can go up to +/-45°

12 RS15 « alternate » -15° steered column coverage

Page 24: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RS15 RS15 ACCESSORIESACCESSORIES

TD CONTROLLERSTD CONTROLLERS

SPECIFICATIONSSPECIFICATIONS

Page 25: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RS15 Bumper (up to 12 RS15s)

RS15 Dolly (up to 2 RS15s)

RS15 Rigging Plates

RS15 Wheels

RS15 ACCESSORIES

Page 26: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

NXAMP4x1 controls and powers up to 2 RS15s in all directional modes

NXAMP4x4 controls and powers up to 8 RS15s in all directional modes

NX242 Digital TDController has 46 presets to combine RS15 with PS series & GeoS series

GeoS12TD Controller features a mono output to operate RS15 in Omnidirectional Mode

RS15 ELECTRONICS

Page 27: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

RS15 SPECIFICATIONS

Page 28: RAY SUB TECHNOLOGY. DIRECTIONAL SUBWOOFERS BENEFITS

THANK YOU !