^{Linear Q Transition Loudspeakers}

TABLE OF CONTENTS

PRICE LIST PAGE

RETAIL, DEALER & CONTRACTOR 3

MODELS

J 18 F - P 4

J 18 B - P 5

J 15 B 6

2-12 DC - P 7

2-12 DC 8

1-15 MH - P 9

1-15 MH 10

CH 112 - P 11

CH 112 12

CH 112 - X 13

CH 112 - FL 14

CH 108 15

CH 108 - X 16

DP 208 17

OPTIONS & ASSOCIATED COSTS

CUSTOM TINTED FINISH 18

CUSTOM TINTED STAIN 18

CUSTOM PAINTED GRILLE 18

CUSTOM COLOR CLOTH WRAPPED GRILLE 18

WEATHER RESISTANT TREATMENT 18

CUSTOM INTERNAL TRANSFORMER 18

PORTABLE HARDWARE & FINISH 18

ADVISORY 19, 20

[ 2 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

LIST PRICE

J 18 F - P $3,600.00 ea.

1,000w full size j-bin 1,000w RMS 18" LF driver

J 18 B - P $1,800.00 ea.

1,000w reduced size j-bin 1,000w RMS 18" LF driver

J 15 B $1,400.00 ea.

600w reduced size j-bin 600w RMS 15" LF driver

DC 212 - P $2,000.00 ea.

875w di-centric 75w RMS 3" (1.4" exit) HF wave guide between two 400w RMS 12" LF drivers

DC 212 $1,750.00 ea.

650w di-centric 50w RMS 3" (1.4" exit) HF horn between two 300w RMS 12" LF drivers

MH 115 - P $2,250.00 ea.

575w full range 75w RMS 3" (1.4" exit) HF wave guide & 500w RMS 15" LF driver

MH 115 $1,850.00 ea.

450w full range 50w RMS 3" (1.4" exit) HF wave guide & 400w RMS 15" LF driver

CH 112 - P $1,750.00 ea.

575w concentric 75w RMS 3" (2" conical exit) HF wave guide & 500w RMS 12" LF driver

CH 112 $1,200.00 ea.

350w concentric 50w RMS 2.5" (1" conical exit) HF wave guide & 300w RMS 12" LF driver

CH 112 - X $1,400.00 ea.

350w concentric 50w RMS 2.5" (1" conical exit) HF wave guide & 300w RMS 12" LF driver

with internal 2-way passive crossover

CH 112 - FL $1,400.00 ea.

350w front loaded for 50w RMS 3" (1.4" exit) HF wave guide & 300w RMS 12" LF driver

stage monitor or nearfield use with internal 2-way passive crossover & portable hardware options

CH 108 $ 950.00 ea.

230w concentric 30w RMS 2.5" (1" conical exit) HF wave guide & 200w RMS 8" LF driver

CH 108 - X $1,150.00 ea.

230w concentric 30w RMS 2.5" (1" conical exit) HF wave guide & 200w RMS 8" LF driver

with internal 2-way passive crossover

DP 208 $1,400.00 ea.

430w di-polar 30w RMS 2.5" (1" exit) HF wave guide & two 200w RMS 8" LF drivers

FOB Dalbec Audio / All Prices & Terms Subject To Change Without Notice

[ 3 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

J 18 F - P 1,000w full size j-bin

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low band frequencies shall be reproduced with one 2,000w Continuous Program / 3,000w Peak (1,000w RMS / EIA-RS-426A), 8 ohm 18" driver with a 4" voice coil, loaded onto a three pole symmetrical wave guide assisted system (aka "J-Bin"), covering 30Hz to 120Hz. Horizontal directivity @ 50Hz is 240 degrees linearly increasing to 120 degrees @ 120Hz. Woofer excursion control provided below wave guide cutoff frequency of 50Hz.

The loudspeaker is capable of producing SPL's in excess of 136db long term, and 142db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 106db.

The enclosure shall be constructed of voidless multi-layer hardwood and finished to specification.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 60" high x 24" wide x 30" deep The loudspeaker weight shall not be greater than 160lbs.

Rear connectors shall utilize Neutrik NL4 ( pins 1+ & 1- ).

[ 4 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

J 18 B - P 1,000w reduced size j-bin

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low band frequencies shall be reproduced with one 2,000w Continuous Program / 3,000w Peak (1,000w RMS / EIA-RS-426A), 8 ohm 18" driver with a 4" voice coil, loaded onto a three pole symmetrical wave guide assisted system (aka "J-Bin"), covering 35Hz to 120Hz. Horizontal directivity @ 50Hz is 240 degrees linearly increasing to 120 degrees @ 120Hz. Woofer excursion control provided below wave guide cutoff frequency of 50Hz.

The loudspeaker is capable of producing SPL's in excess of 134db long term, and 140db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 104db.

The enclosure shall be constructed of voidless multi-layer hardwood and finished to specification.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 36" high x 24" wide x 30" deep The loudspeaker weight shall not be greater than 130lbs.

Rear connectors shall utilize Neutrik NL4 ( pins 1+ & 1- ).

[ 5 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

J 15 B 600w reduced size j-bin

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low band frequencies shall be reproduced with one 1,200w Continuous Program / 1,800w Peak (600w RMS / EIA-RS-426A), 8 ohm 15" driver with a 4" voice coil, loaded into a three pole symmetrical wave guide assisted system (aka "J-Bin"), covering 35Hz to 120Hz. Horizontal directivity @ 50Hz is 240 degrees linearly increasing to 120 degrees @ 120Hz. Woofer excursion control provided below wave guide cutoff frequency of 50Hz.

The loudspeaker is capable of producing SPL's in excess of 128db long term, and 134db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 102db.

The enclosure shall be constructed of voidless multi-layer hardwood and finished to specification.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 36" high x 24" wide x 30" deep The loudspeaker weight shall not be greater than 130lbs.

Rear connectors shall utilize Neutrik NL4 ( pins 1+ & 1- ).

[ 6 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

DC 212 - P 875w di-centric array

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with two 800w Continuous Program / 1200w Peak (400w RMS / EIA-RS-426A), 8 ohm 12" drivers with 3" voice coils mounted on a constant directivity wave guide, covering 80Hz to 2500Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 2000Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 150w Continuous Program / 225w Peak (75w RMS / EIA-RS-426A), 8 ohm, 3" large format compression driver loading a 1.4" throated constant directivity wave guide covering 1500Hz to 20kHz. Horizontal directivity is 60 degrees. Vertical directivity is 40 degrees.

The loudspeaker is capable of producing SPL's in excess of 133db long term, and 138db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 105db.

The enclosure shall be constructed of voidless multi-layer hardwood and finished to specification. A perforated, impact resistant metal grille is fitted to the front of the loudspeaker and finished to specification.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 36" high x 20" wide x 20" deep The loudspeaker weight shall not be greater than 100lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 7 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

DC 212 650w di-centric array

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with two 600w Continuous Program / 900w Peak (300w RMS / EIA-RS-426A), 8 ohm 12" drivers with 3" voice coils mounted on a constant directivity wave guide, covering 80Hz to 2500Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 2000Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 100w Continuous Program / 150w Peak (50w RMS / EIA-RS-426A), 8 ohm, 3" large format compression driver loading a 1.4" throated constant directivity wave guide covering 1500Hz to 20kHz. Horizontal directivity is 90 degrees. Vertical directivity is 40 degrees.

The loudspeaker is capable of producing SPL's in excess of 130db long term, and 136db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 103db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 36" high x 20" wide x 20" deep The loudspeaker weight shall not be greater than 100lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 8 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

MH 115 - P 575w full range system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with one 1,000w Continuous Program / 1,500w Peak (500w RMS / EIA-RS-426A), 8 ohm 15" driver with a 4" voice coil mounted on a constant directivity wave guide, covering 45Hz to 2000Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 1800Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 150w Continuous Program / 225w Peak (75w RMS / EIA-RS-426A), 8 ohm 3" large format compression driver loading a 1.4" throated constant directivity wave guide covering 1500Hz to 20kHz. Horizontal directivity is 90 degrees. Vertical directivity is 40 degrees.

The loudspeaker is capable of producing SPL's in excess of 130db long term, and 136db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 103db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 32" high x 22" wide x 22" deep The loudspeaker weight shall not be greater than 90lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 9 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

MH 115 450w full range system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with one 800w Continuous Program / 1,200w Peak (400w RMS / EIA-RS-426A), 8 ohm 15" driver with a 4" voice coil mounted on a constant directivity wave guide, covering 60Hz to 2000Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 1800Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 100w Continuous Program / 150w Peak (50w RMS / EIA-RS-426A), 8 ohm 3" large format compression driver loading a 1.4" throated constant directivity wave guide covering 1500Hz to 20kHz. Horizontal directivity is 60 degrees. Vertical directivity is 40 degrees.

The loudspeaker is capable of producing SPL's in excess of 129db long term, and 135db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 103db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 32" high x 22" wide x 22" deep The loudspeaker weight shall not be greater than 90lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 10 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

CH 112 - P 575w concentric system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with one 1,000w Continuous Program / 1,500w Peak (500w RMS / EIA-RS-426A), 8 ohm 12" driver with a 4" voice coil mounted on a constant directivity wave guide, covering 100Hz to 2500Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 2000Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 150w Continuous Program / 225w Peak (75w RMS / EIA-RS-426A), 8 ohm 3" large format compression driver loading a 2" throated, coaxially mounted conical wave guide covering 1500Hz to 20kHz. Horizontal and vertical directivity is 60 degrees.

The loudspeaker is capable of producing SPL's in excess of 130db long term, and 136db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 103db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 20" high x 20" wide x 20" deep The loudspeaker weight shall not be greater than 60lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 11 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

CH 112 350w concentric system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with one 600w Continuous Program / 900w Peak (300w RMS / EIA-RS-426A), 8 ohm 12" driver with a 4" voice coil mounted on a constant directivity wave guide, covering 100Hz to 2500Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 2000Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 100w Continuous Program / 150w Peak (50w RMS / EIA-RS-426A), 8 ohm 2.5" compression driver loading a 1" throated, coaxially mounted conical wave guide covering 1500Hz to 20kHz. Horizontal and vertical directivity is 60 degrees.

The loudspeaker is capable of producing SPL's in excess of 128db long term, and 134db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 103db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 20" high x 20" wide x 20" deep The loudspeaker weight shall not be greater than 60lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 12 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

CH 112 - X 350w concentric passive system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

The 2-way internal crossover shall utilize a 400w RMS, 8 ohm, 18db per octave high pass filter and a 12db per octave low pass filter at 1600Hz. Voltage dependent soft limiting resistors, high quality polycarbonate capacitors and components are surface mounted.

The loudspeaker is capable of producing SPL's in excess of 126db long term, and 132db short term within the specified frequency range. Sensitivity (1w / 1meter) = 102db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 20" high x 20" wide x 20" deep The loudspeaker weight shall not be greater than 60lbs.

Rear connectors shall utilize Neutrik NL4 (pins 1+ & 1-).

[ 13 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

CH 112 - FL 700w concentric

Directivity assist (200-1200hz.) stage monitor

SPECIFICATION

Low and Mid band frequencies shall be reproduced with one 600w Continuous Program / 900w Peak (300w RMS / EIA-RS-426A), 8 ohm 12" driver with a 3" voice coil covering 70Hz to 2500Hz. Horizontal directivity @ 500Hz is 160 degrees linearly increasing to 100 degrees @ 2000Hz. Vertical directivity averages at 80 degrees.

High frequencies will be reproduced with one 100w Continuous Program / 150w Peak (50w RMS / EIA-RS-426A), 8 ohm 2.5" compression driver loading a 1.4" throated, coaxially mounted conical wave guide covering 1500Hz to 20kHz. Horizontal and vertical directivity is 80 degrees.

The loudspeaker is capable of producing SPL's in excess of 126db long term, and 132db short term within the specified frequency range. Sensitivity (1w / 1meter) = 98db.

The loudspeaker dimensions shall be no larger than 16" high x 20" wide x 14" deep The loudspeaker weight shall not be greater than 50lbs.

Rear connectors shall utilize dual Neutrik NL4 .

[ 14 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

CH 108 230w concentric system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with one 400w Continuous Program / 600w Peak (200w RMS / EIA-RS-426A), 8 ohm 8" driver with a 3" voice coil mounted on a constant directivity wave guide, covering 100Hz to 2000Hz. Horizontal directivity @ 500Hz is 110 degrees linearly increasing to 80 degrees @ 1800Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 60w Continuous Program / 90w Peak (30w RMS / EIA-RS-426A), 8 ohm 2.5" compression driver loading a 1" throated, coaxially mounted conical wave guide covering 1500Hz to 20kHz. Horizontal and vertical directivity is 60 degrees.

The loudspeaker is capable of producing SPL's in excess of 124db long term, and 130db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 100db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 16" high x 14" wide x 15" deep The loudspeaker weight shall not be greater than 30lbs.

Rear connectors for bi-amp operation shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 15 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

CH 108 - X 230w concentric passive system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

The 2-way internal crossover shall utilize a 400w RMS, 8 ohm, 18db per octave high pass filter and a 12db per octave low pass filter at 1800Hz. Voltage dependent soft limiting resistors, high quality polycarbonate capacitors and components are surface mounted.

The loudspeaker is capable of producing SPL's in excess of 124db long term, and 130db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 100db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 16" high x 14" wide x 15" deep The loudspeaker weight shall not be greater than 30lbs.

Rear connectors shall utilize Neutrik NL4 (pins 1+ & 1-).

[ 16 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

DP 208 430w di-polar system

SPECIFICATIONS:

The loudspeaker shall be a wave guide loaded type.

Low and Mid band frequencies shall be reproduced with two 400w Continuous Program / 600w Peak (200w RMS / EIA-RS-426A), 8 ohm 8" driver with a 2 1/2" voice coil mounted on a in a di-pole configuration on two parallel constant directivity wave guides, covering 100Hz to 2000Hz. Horizontal directivity @ 500Hz is 140 degrees linearly increasing to 100 degrees @ 1800Hz. Vertical directivity averages at 60 degrees.

High frequencies will be reproduced with one 60w Continuous Program / 90w Peak (30w RMS / EIA-RS-426A), 8 ohm 2.5" compression driver loading a 1" throated wave guide covering 1500Hz to 20kHz. Horizontal and vertical directivity is 60 degrees.

The loudspeaker is capable of producing SPL's in excess of 124db long term, and 130db short term within the specified frequency range.

Sensitivity (1w / 1meter) = 101db.

All internal mounting hardware exhibiting a 10:1 safety margin shall be provided per installation specification.

The loudspeaker dimensions shall be no larger than 10" high x 14" wide x 10" deep The loudspeaker weight shall not be greater than 40lbs.

Rear connectors shall utilize Neutrik NL4 (pins 1+ & 1- for LF/MB, pins 2+ & 2- for HF).

[ 17 of 20 ]

58 King Street Troy, NY 12180

phone (518) 272-7098 fax (518) 272-2520

L Q t

^{Linear Q Transition Loudspeakers}

OPTIONS & ASSOCIATED COSTS

Standard box finishes are black or white Duratec textured finish. Standard perforated metal grilles are coated in black. Custom finishes and other options are available as listed below.

LIST PRICE

CUSTOM

TINTED $ 150.00 /box

DURATEC FINISH

CUSTOM

TINTED STAIN $ 300.00 /box

/ CLEAR COATED

CUSTOM

COATED GRILLE $ 100.00 /box

COLOR

CUSTOM

COLOR CLOTH $ 100.00 /box

WRAPPED GRILLE

WEATHER
RESISTANT $ 200.00 /box

TREATMENT

PORTABLE
HARDWARE $ 200.00 /box

& FINISH (handles, pole cup, double coated finish)

CUSTOM

INTERNAL 70v $ 150.00 /box

*TRANSFORMER * limits loudspeaker performance to 100w RMS

[ 18 of 20 ]

Richard Dalbec

58 King Street l Troy, New York 12180

phone (518) 272-7098 l fax (518) 272-2520

dalbec@dalbec.com

ADVISORY

Linear Q Transition

loudspeaker series

[ rev 05/16/03 ]

General Description:

Dalbec Audio's Linear Q Transition loudspeaker series, herein referred to as "LQt", exhibit numerous desirable performance characteristics not available in size or price equivalents. The LQt series is designed to excel in mid

to far field (>50') quality reinforcement environments and performing arts applications especially in reverberant, acoustically challenged venues, or in situations where conventional systems have not proven successful.

Directivity control management is the most important characteristic that differentiates the LQt series from traditional loudspeaker arrays. Conventional compact type systems lack usable directivity control between the critical 100Hz to 2kHz range. These systems achieve satisfactory directivity only above the HF (high frequency) cross point (typically around 2kHz) rendering the programming between 100Hz and 2kHz unacceptable in critical venues. Most manufacturers publish directivity figures for their assemblies, stating only the high frequency (HF) wave guide performance. There has been a recent trend with some manufacturers publishing "average" directivity data which still avoids specific directivity figures for frequencies under 2kHz. It is shameful that such misrepresented estimates are used as the source data fed into the latest wave of computer generated performance predictions.

Manufacturers of said smaller format assemblies avoid publishing specifications on directivity control for the lower frequencies due to the fact that little or no control is present below approximately 2kHz with their units. This results in minimal articulate distance, exaggerated room interaction, poor mid to far field balance, as well as spill over to the microphone sources which also reduces gain to feedback ratios. Unfortunately, otherwise wonderful new installations have been compromised by misrepresented loudspeaker components, and the trend to supply these flawed systems is growing.

The LQt Concept: A Solution to These Directivity Problems

The most critical performance characteristic a loudspeaker can exhibit is wideband control of directivity suited to the application. Conventional loudspeaker parameters such as frequency response and phase coherence are easily correctable with the most basic of electronic processing, yet no device exists to convert a conventional loudspeaker with chaotic LF and MB directivity charateristics into an acceptable performer.

The Dalbec Audio LQt series utilizes proprietary physical design characteristics that bridge the gap between the effective yet very large and exotic far field systems and the conventional smaller format units lacking directivity control. Through more than 15 years of research and field application, an ideal combination of compact component size and directivity performance has been realized, yielding a smooth, linear transition of directivity from the predictable high frequencies, through the critical and often neglected mid and lower frequencies, rendering conventional compact array designs unacceptable in critical applications.

[ 19 of 20 ]

LQt technology is a parameter we address as a function of critical performance. Secondary advanced concept designs include the following:

A. Advanced Large Format H.F. Assemblies

A significant HF driver motor to wave guide throat design removes the HF driver motor from the MB / LF (mid band / low frequency) wave guide cavity placing the HF wave guide at the acoustic center of the MB / LF wave guide improving coherence, in addition to eliminating all stress on the wave guide throat. Another distinct advantage to this mounting method allows the HF wave guide exit to sum into the MB / LF wave guide without a front wave guide mounting apparatus to aberrate the mix. CAD machining was required to enable us to duplicate the complex HF wave guide model parts from a perfect inert polymer - WOOD! Yes, all wave guide parts are of voidless laminated hardwood, effectively inert, structurally and acoustically superior to cast or molded wave guides.

B. Our "Unconventional" 2-12, 3 Component, Two Way Line Array

Also Solves Vertical Control Deficiencies

In addition to addressing and improving component control in the horizontal plane, we focused much attention to developing specific models with superior vertical directivity performance. Conventional vertical line arrays to date have proven to be the most accepted mechanical method to improve vertical control. Unfortunately conventional arrays possess inherent deficiencies, such as phase cancellations between common drivers above and below the vertical axis center point. Our Dalbec LQt model 2-12 DC, three component, 2-way enclosure configuration, when utilized in conjunction with a proper loudspeaker management processor, virtually eliminates vertical cancellation errors, exhibiting vertical

Cylindrical wavefront characteristics with point source fidelity.

C. General Misc. / Details

1. Driver Component Selection

The source of radiation is of utmost importance in realizing faithful, reliable operation, and we utilize the best components available, which are specifically manufactured to our exacting specifications. Our decades of field testing raw components from vendors around the world has yielded a large database of the best performing drive assemblies regardless of cost. From our experience, most manufacturers of premium drive components don't seem to produce very good finished loudspeaker products. Likewise, many of the names associated with premium professional loudspeaker assemblies don't produce their own drive components either.

2. Architectural & Aesthetic Considerations

Our finish department is able to provide a wide variety of custom appearances. Although standard enclosures include black, or white in a textured satin finish, or natural birch, we can finish in any furniture grade in either satin, or full gloss clear coat. In addition to the wide variety of optional finishes, the grilles can be custom painted or covered in a wide range of available colored acoustic fabric. Additionally, all of our components are available in weather resistant packages from high moisture to full exposure conditions.

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