GENERAL
GUIDELINES
FOR
SUBWOOFER
DESIGN
System Manual RS Series
Page
39
/
76
6
GENERAL GUIDELINES FOR SUBWOOFER DESIGN
6.1
Low Frequency Issues
Even low frequency coverage is amongst the toughest issues in sound system design. Common issues that are faced in design
are as follow:
Low frequency radiation is hard to control efficiently because of wavelength
becoming large (10m / 30ft at 34 Hz) in relation to sources; and most of
available subwoofers are omnidirectional; this results in important low
frequency feedback on stage, environmental problems in outdoor venues
and increased reverberation time in indoor venues;
Stereophonic implementation of subwoofers introduces very strong
interference patterns; these are related to Left and Right path length
difference to listener location while pressure levels are comparable for Left
and Right arrays; while always maximum at the center
– where distance to
Left and Right arrays are equal -, pressure level can severely drop at
locations where path length equals half the wavelength of frequency of
interest. This effect is well-known from audio-engineers, and often referred
to as “Power Alley”;
In closed venues, room eigen modes (nulls and max) are dominant over
source location; because these modes depend on accurate characterization
of boundary surfaces (walls, ceiling, floor), audience coverage is very hard
to predict.
To overcome these difficulties, some common-sense rules can help.
6.2
Gradient Subwoofers benefits
Gradient subwoofers can provide up to 15 dB front to rear average attenuation (Please refer to Ray
Sub technical note for in-detail explanation on gradient subwoofers).
Low frequency level on stage is therefore significantly reduced on stage, and in the neighbouring
environment in open air venues.
Because of their directional pattern, Gradient subwoofer are also less sensitive to room eigen
modes.
f1=C/2L
L(m)
f1=C/2L
L(m)
Summary of Contents for RS Series
Page 1: ...DP5235 01 CM RS Series RS15 RS18 Subwoofers System manual ...
Page 12: ...CONNECTION DIAGRAMS Page 12 76 System Manual RS Series 3 3 RS15 NXAMP4x2mk2 4 channels mode ...
Page 13: ...CONNECTION DIAGRAMS System Manual RS Series Page 13 76 3 4 RS15 NXAMP4x4mk2 4 channels mode ...
Page 14: ...CONNECTION DIAGRAMS Page 14 76 System Manual RS Series 3 5 RS18 NXAMP4x4mk2 4 channels mode ...
Page 60: ...TECHNICAL SPECIFICATIONS Page 60 76 System Manual RS Series 8 2 2 Dimensions mm inches ...
Page 66: ...TECHNICAL SPECIFICATIONS Page 66 76 System Manual RS Series 8 3 6 RSI INSP15 Parts X4 X8 X8 ...
Page 75: ...USER NOTES System Manual RS Series Page 75 76 10 USER NOTES ...