CBT 70J-1 and CBT 70JE-1 Bracket Installation Guide Rev B – For Swivel/Tilt Wall Bracket Included: SPEAKER BRACKET SWIVEL-TILT WALL BRACKET M6-60L M6-15L Pan head SS Flat washers M6-nuts SS Lock washers switch covers M6-20L Flat head SS Lock washers SS Flat washers COUPLER PLATE
WALL MOUNTING Note that the BRACKET ASSEMBLY consists of a SPEAKER BRACKET and a WALL BRACKET. 1) RUN WIRING -- Run the wiring from the power amplifier to the location desired for mounting the JBL CBT Loudspeakers. 2) ATTACHING WALL BRACKET TO WALL -- Using a level to ensure that the WALL BRACKET is straight, secure the WALL BRACKET to the wall. Be sure to use the appropriate wall anchors for attaching the bracket. Use all four screw holes for maximum integrity and safety.
) ATTACH SPEAKER BRACKET TO SPEAKER 3a) CBT 70J-1 -- Mount the SPEAKER BRACKET to the speaker with the provided M6-15L hardware. For the CBT 70J-1 there are three (3) possible mounting positions. Choose the one that best suits the application. Be sure the hook feature is downward.
3b) CBT 70J-1 + 70JE-1 Vertical Array -- Mount the COUPLER PLATE (included with the CBT 70JE-1) to the CBT 70J-1 and CBT 70JE-1 speakers with the provided eight (8) pieces of M6-20L flat-head bolts. (See “CBT 70J-1 and CBT 70JE1 Coupler Plate Dimensions & Connection Point Locations” drawing, below, for exact locations). Then attach the SPEAKER BRACKET to the COUPLER PLATE with the provided M6-15L pan-head bolts, lock washers and flat washers. Be sure the hook feature is downward.
4) SLIDE SPEAKER WITH SPEAKER BRACKET ONTO WALL BRACKET Make sure the PIVOT BOLT is installed in-place in the WALL BRACKET. It consists of the M6-60L bolt with lock washer and flat washer on the head (as shown in DETAIL “A”, below) and secured in place with flat washer, lock washer and M6 nut. Leave the nut loose (do not tighten).
5) SET THE TILT ANGLE – Once the speaker has nested securely on the pivot bolt, slide the second M6-60L bolt into one of the holes in top of the wall bracket to set the angle. 5a) TILT ANGLES -- The bracket allows for +/-15 degrees of tilt. 5b) PRE- SET ANGLES and CONTINUOUSLY VARIABLE ANGLE -- The bracket has through holes for mounting angles of +/- 15 degrees in 5 degree increments. There is also a slot above the holes for continuously variable adjustment.
6) SET THE SWIVEL (PAN) ANGLE – Loosen the top and bottom bolts on the pivot. Adjust the side-to-side swivel (ie, pan) aiming angle of the speaker. Re-tighten the bolts securely at desired swivel (pan) angle. Maximum Swivel Angles before Wall Interference – The bracket swivels a full 90 degrees from side-to-side, however when mounting the CBT speaker onto a wall, the side-to-side swivel may be limited by the end of the speaker encountering the wall.
CBT 70J-1 Bracket Dimensions CBT 70J-1 and CBT 70JE-1 Coupler Plate Dimensions & Connection Point Locations 4 – M6 x 8 mm threaded holes for included CBT 70J-1 wall bracket Countersunk thru holes (8 places) for flat-head screws into back cabinet inserts of CBT 70J-1 and CBT 70JE-1 JBL Professional 8500 Balboa Blvd.
Quick Start Guide for Sound System Designers JBL CBT Series Constant Beamwidth Technology™ Column Loudspeakers (Note: Some models shown with the included grilles removed to illustrate driver composition.
CBT Quick Start Guide 2 CONTENTS Introduction .................................................................................................................... 3 • • Understanding the Charts o SPL Maps o Frequency Response Charts Room Sizes Shown Example #1 – Flat Listening Plane CBT 50LA ..................................................................................................................... 4 CBT 100LA in Broad Setting ......................................................................
CBT Quick Start Guide 3 Excellent coverage of a wide variety of room types can be accomplished using JBL’s CBT Line Array Column Loudspeakers. This guide shows some starting-point examples of placement, aiming and resulting performance of the various CBT models in a variety of simplified sectional-view examples. There are 16 simulations in total, comprised of 4 examples of room-size / seating-plane scenarios.
CBT Quick Start Guide 4 Example #1 -- Flat Listening Plane Description -- This is the most basic of rooms. All four CBT models are shown, as well as both “Broad” and “Narrow” vertical coverage settings for those models that have the switchable coverage capability (CBT 100LA & 70J) Listening Plane = 1.2 m (4 ft) above the floor Mic Placement = 6.1 m (20 ft, red icon), 10.7 m (35 ft, blue icon) and 16.8 m (55 ft, green icon) CBT 50LA Trim Height = 3.
CBT Quick Start Guide 5 Example #1 -- Flat Listening Plane CBT 100LA in Broad Setting Trim Height = 4.
CBT Quick Start Guide 6 Example #1 -- Flat Listening Plane CBT 100LA in Narrow Setting Trim Height = 3.
CBT Quick Start Guide 7 Example #1 -- Flat Listening Plane CBT 70J in Broad Setting Trim Height = 4 m (13 ft, Top of Speaker) Down Tilt = 5° Vertical Coverage Setting = Broad SPL(Full rated power, low-Z, SPEECH setting, 4 kHz, scale in feet): 105 30 100 SPL Range 25 95 20 90 15 85 10 80 5 0 0 10 20 30 40 50 60 70 75 4 kHz Frequency Response (Full rated power, low-Z, speech setting, mic positions as designated above):
CBT Quick Start Guide 8 Example #1 -- Flat Listening Plane CBT 70J in Narrow Setting Trim Height = 3.
CBT Quick Start Guide 9 Example #1 -- Flat Listening Plane CBT 70J+70JE in Broad Setting Trim Height = 5.
CBT Quick Start Guide 10 Example #1 -- Flat Listening Plane CBT 70J+70JE in Narrow Setting Trim Height = 3.
CBT Quick Start Guide 11 Example #2 –Highly-Raked Seating Description – This example is somewhat typical of venues such as lecture halls, performance spaces, and auditoriums. Shown are the CBT 100LA, CBT 70J and the CBT 70J+70JE combination. All are set at the Broad Vertical Coverage setting. Listening Plane = Rise of 4.9 m (16 ft) in 15.2 m (50 ft) of depth, beginning 1.2 m (4 ft) above the floor. Mic Placement = 6.1 m (20 ft, red icon), 10.7 m (35 ft, blue icon) and 16.
CBT Quick Start Guide 12 Example #2 – Highly-Raked Seating CBT 70J in Broad Setting Trim Height = 5.
CBT Quick Start Guide 13 Example #2 – Highly-Raked Seating CBT 70J+70JE in Broad Setting Trim Height = 5.
CBT Quick Start Guide 14 Example #3 –Gentle Rake with Balcony Description – This example is also common for performance spaces and auditoriums. Shown are the CBT 100LA, CBT 70J and the CBT 70J+70JE combination. All are set at the Broad Vertical Coverage setting. Listening Planes = Main: Rise of 0.6 m (2 ft) in 9.1 m (30 ft) of depth, beginning 1.2 m (4 ft) above the floor. Balcony: Rise of 1.5 m (5 ft) in 7.6 m (25 ft) of depth, beginning 4.6 m (15 ft) above the original floor. Mic Placement = 6.
CBT Quick Start Guide 15 Example #3 – Gentle Rake with Balcony CBT 70J in Broad Setting Trim Height = 4.
CBT Quick Start Guide 16 Example #3 – Gentle Rake with Balcony CBT 70J+70JE in Broad Setting Trim Height = 5.
CBT Quick Start Guide 17 Example #4 –Three-Tiered Raked, Large Room Description –This is a larger room with a depth of 39.6 m (130 ft). The room could represent a venue with dual balcony or it could represent an auditorium with a front section having a gentle rake and a back having a steeper rake. Shown are the CBT 100LA, CBT 70J and the CBT 70J+70JE combination. All are set at the Broad Vertical Coverage setting. Listening Plane = Three tiers Mic Placement = 7.6 m (25 ft, red icon) and 19.
CBT Quick Start Guide 18 Example #4 – Three-Tiered Raked CBT 70J in Broad Setting Trim Height = 7.
CBT Quick Start Guide 19 Example #4 – Three-Tiered Raked CBT 70J+70JE in Broad Setting Trim Height = 7.
CBT Quick Start Guide 20 Design Conclusions Vertical Coverage Setting vs. Installation Height – In general, when the CBT speaker is set to the Narrow vertical coverage setting, the speaker tends to cover best when installed fairly low and angled at a fairly narrow down-tilt angle in relation to the seating plane.
CBT Quick Start Guide 21 How Far Each CBT Model “Throws” – Speaker “throw” has many possible definitions, some of which require knowledge of venue-specific factors, such as acoustics, seating plane particulars, or SPL differences between one listening location and another. One speaker-specific definition of “throw” would be the distance at which the speaker can project a useful sound level.
CBT 70J-1 Constant Beamwidth Technology™ Two-Way Line Array Column with Asymmetrical Vertical Coverage Key Features: Asymmetrical vertical coverage sends more sound toward far area of room to make front-toback sound levels more consistent. Components: Sixteen 25 mm (1 in) soft dome tweeters and four 125 mm (5 in) high-power LF drivers, arranged coaxially. Patent-pending Constant Beamwidth Technology™ provides constant directivity up to the highest frequencies and reduces out-ofcoverage lobing.
CBT 70J-1 Two-Way Line Array Column with Asymmetrical Vertical Coverage Specifications: System: Components: Four 130 mm (5 in) LF drivers Sixteen 25 mm (1 in) HF drivers Frequency Range (-10 dB)1: 60 Hz – 20 kHz Coverage: Vertical (selectable via switch) Narrow Mode: 25° (2 kHz - 16 kHz) (±10°) Broad Mode: 45° (750 Hz - 16 kHz) (±10°) Horizontal 150° (500 Hz – 8 kHz, ±20°) Sensitivity (2.
CBT 70J-1 Two-Way Line Array Column with Asymmetrical Vertical Coverage Broad Setting Narrow Setting Horizontal 1/3 Octave Polars 0° 0 330° 0° 0 330° 30° -6 30° -6 300° 300° 60° 60° 200 Hz 200 Hz 250 Hz 270° 240° 250 Hz 270° 90° 315 Hz 400 Hz 400 Hz 240° 120° 210° 90° 315 Hz 120° 210° 150° 180° 0° 0 330° 150° 180° 0° 0 330° 30° -6 30° -6 300° 300° 60° 60° 500 Hz 500 Hz 630 Hz 270° 240° 630 Hz 270° 90° 800 Hz 1 kHz 1 kHz 240° 120° 210° 90° 800 Hz 120°
Broad Setting Narrow Setting Vertical 1/3 Octave Polars 90° 120° 90° 120° 60° 150° 60° 150° 30° 30° 200 Hz 200 Hz 250 Hz 180° -6 250 Hz 180° 0° 0 -6 315 Hz 0° 0 315 Hz 400 Hz 210° 400 Hz 210° 330° 240° 330° 240° 300° 270° 90° 120° 300° 270° 90° 120° 60° 150° 60° 150° 30° 30° 500 Hz 500 Hz 630 Hz 180° -6 630 Hz 180° 0° 0 -6 800 Hz 0° 0 800 Hz 1 kHz 210° 1 kHz 210° 330° 240° 330° 240° 300° 270° 90° 120° 300° 270° 90° 120° 60° 150° 60° 150° 30
CBT 70J-1 Two-Way Line Array Column with Asymmetrical Vertical Coverage Broad Setting Narrow Setting Frequency Response: Frequency Response: 40 100 40 90 30 90 30 80 20 80 20 70 10 70 10 60 20 100 1000 10000 SPL (dB) 100 0 20000 60 20 100 Frequency (Hz) Beamwidth: -6 dB Beamwidth (degrees) Vertical 10 20 100 1000 10000 Vertical 10 20 20000 100 10 10 100 1000 10000 Directivity Index (DI), dB 100 Directivity Factor (Q) Directivity Index (DI), dB Directivity, Q 2
CBT 70J-1 Two-Way Line Array Column with Asymmetrical Vertical Coverage Dimensions: Dimensions in mm [in] 70 [2.75] 170 [6.7] 237 [9.3] 94 [3.7] 127 [5.0] 127 [5.0] 694 [27.4] 127 [5.0] 127 [5.0] M6x1.0P (10 places) 165 [6.5] Wall Bracket Ø7.2 [Ø0.3] 70 [2.75] 208.4 [8.2] 88 [3.5] Ø6.5 [Ø0.26] Tilt Angle Adjustment: Slot ( ±15°, continuous ) Pre-Set Angles ( 5° increments ) 254 [10.0] Toward Loudspeaker Toward Wall 177 [7.
How to Obtain Warranty Performance The JBL Warranty on professional loudspeaker products (except for enclosures) remains in effect for five years from the date of the first consumer purchase. JBL amplifiers are warranted for three years from the date of original purchase. Enclosure and all other JBL products are warranted for two years from the date of original purchase.
