LQt Defined
The DALBEC AUDIO Linear Q Transition LQt Series of professional loudspeaker enclosures has been developed over 25 years of applications research. The performance characteristics of the LQtTM line offer many advantages not found in this size and weight category. Research associates at DALBEC AUDIO have been field testing a number of patent pending prototype systems in hundreds of venues throughout the Northeast for recently with great success. User endorsements of systems utilizing our Linear Q Transition (LQt) components have been conclusive.
LQt or linear Q transition characteristic is defined as ; The horizontal directivity index “Q” (inversely, the Beamwidth) of the system is directly proportional to the frequency of operation; exhibiting a “linear” directivity signature ; effective from 50 hz. to 20 khz.
FACT: The two most important characteristics an enclosure must exhibit for correct interaction within most venue environments are frequency/phase control and broadband directivity control. These characteristics are not exhibited by conventional direct radiating enclosures. Whether confronted with an acoustically sensitive auditorium, an outdoor or any other non-nearfield event, or feedback spill over on a tight performance stage, applying proper horizontal and vertical coverage management provides profoundly dramatic and often overlooked, successful results such as:
– increased source articulation- greater critical distance (less room interaction)
– increased efficiency
– greater gain before feedback
– near/far field balance
All trained acousticians realize the value of the research of Harry Olsen (RCA ) ; and Western Electric scientists, 75 years ago ; defining these basic large format pattern controlled concepts utilized today. This original large format concept has declined due to a number of disadvantages including:
– size restraints (rigging, portability)
– much higher costs for enclosures
– lower fidelity in the nearfield listening area
– excessive interference between shared components (large acoustic spacing)
Recent research with advanced line arrays as described in AES 2SR.04 ;Sound Fields Radiated by Multiple Sound Source Arrays.(Christian Heil and Marcel Urban) defines the physical standard improving the nearfield fidelity, and wavefront character of the basic large format line array,
This concept is currently state of the art ; although with a few disadvantages.
Multiple components (8 minimum) per L/R array required; Low Efficiency Requiring two to three times more power and or components over waveguide assisted systems.
FEATURES
DALBEC AUDIO’s Linear Q Transition (LQt) concept bridges the gap between the old large format, rigged array, directive designs commonly still accepted for larger venues (ie: arenas, stadiums, etc.) and the state of the art tightly coupled line arrays. The result is point source fidelity ; Our dicentric series components approach a cylindrical character from a single compact enclosure.
DALBEC AUDIO’s LQt systems also feature:
– coherent phase & frequency performance at critical distances
– additional proprietary manufacturing techniques applied to reduce size and weight to improve maneuverability and installation requirements
– computer modeled, coherent and LQt directional LF enclosures
– DSP or DALBEC ASP linear processor option for LQtTM Series incorporating a di-centricTM crossover, Bessel, CD & LF EQ ; multiband limiting
Our advanced dicentric models – ( Patent US 6,981,570 B2)
– patented enclosure architecture– exceeding AES 2SR.04 line array criteria (improved efficiency; and single component cylindrical wavefront performance)
BENEFITS
Immediate benefits of DALBEC AUDIO’s LQt systems include:
– superior articulation and fidelity for speech, music or combination of , at venue sizes with distances greater than 50 feet from sources ie: auditoriums, houses of worship, theaters, arenas, stadiums, parks, etc.
– increased control / greater gain in acoustically challenged spaces
– less room interaction due to wide band pattern control
– Cylindrical wavefront character
Other benefits in choosing DALBEC AUDIO products include the following:
– access to the Northeast’s leading technical staff in engineered audio providing engineering assistance, licensed technicians & systems designers – room design / analysis
– custom fabrication of enclosures ; equipment racks ; workstations
– architectural integration with any installation atmosphere
The LQt mid/high design provides linear control across the frequency band.
The LQt mid high designs volume reduces only 3db. doubling distance as compared to standard mid high boxes that lose 6 db. Doubling distance.
Hence LQt patterned boxes require only one tenth amount the power for equal volume as standard box at 100 feet.