JBL AC28 Datasheet
Compact 2-way Loudspeaker
Key Features:
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Compact enclosure
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Dual 205 mm (8 in) LF transducers
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120° x 60° Progressive Transition™ Field
Rotatable Waveguide with a 25 mm (1 in) exit
compression driver
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Dual Neutrik NL4 connectors plus
screw terminals
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Multiple Attachment Points for Ultimate
Flexibility
Applications:
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Performing Arts Facilities
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Houses of Worship
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Sports Facilities
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Multi Media Spaces
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Retail Spaces
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Presentation Suites
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Educational Facilities
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Portable Audio-Visual Systems
The AC28/26 is a compact full-range
loudspeaker system designed to provide
maximum bandwidth and SPL in a single
system package and yet be visually unobtrusive.
The enclosure design allows for installation
very close to walls and ceilings making it an
ideal choice for under balcony, column, or
wall mounting. The high frequency device
is a 1” exit compression driver integrated
into a newly designed 120° x 60° rotatable
PT™ (Progressive Transition) waveguide
providing even coverage throughout the
intended listening area. The combination
exhibits smooth power response resulting
in extremely natural voicing. The AC28/26
utilizes dual 8” Symmetrical Field Geometry
(SFG™) LF Transducers each with a copperclad aluminum edge wound 2.5” voice coil
and a copper-clad pole piece that improves
performance by reducing voice coil inductance
and distortion. Filtered Array Technology
(FAT™) is utilized to independently control
the dual woofers for magnitude and phase
response resulting in smoother power response
and constant coverage. To further enhance the
flexibility and performance of the AC28/26,
JBL engineers have designed a user selectable
crossover network to ensure complete
accuracy of the high-frequency coverage
pattern regardless of whether the loudspeaker
is being used in the vertical or in the horizontal
orientation when the horn is rotated.
The rugged multiply hardwood enclosure is
designed to work in the vertical plane as well
as in the horizontal plane. Mounting points are
provided for an optional U-bracket and for an
OmniMount® type bracket. The AC28/26 is
also equipped with attachment points located
on the bottom of the enclosure for a stand
mount accessory.
The rugged plywood enclosure features
JBL’s textured DuraFlex™ finish and is
equipped with a heavy duty powder coated
steel, foam-backed grille.
AC28/26
System with 2 - 8” LF
Specifications:
System:
Frequency Range (-10 dB): 53 Hz - 20 kHz
Frequency Response (+/-3 dB): 65 Hz - 20 kHz
Horizontal Coverage: 120°
Vertical Coverage: 60°
Directivity Factor (Q): 8.1 (avg. 500 Hz - 16 kHz)
Directivity Index (DI): 6.9 dB (avg. 500 Hz - 16 kHz)
System Sensitivity1: 94 dB SPL/1W/1m
Rated Maximum SPL (1m)2: 120 dB
System Nominal Impedance: 8 Ohms
Long-Term System Power Rating3:
(Continuous/Program/Peak): 375 W / 750 W / 1500 W
AES Standard Power Rating4: 700 W
Crossover: 2.1 kHz
Transducers:
Low Frequency Driver:
High Frequency Driver: 1 x 2408H-1 25 mm (1 in) exit compression driver, 38 mm (1.5 in) voice
High-Frequency Waveguide: PT-D126HF-1 (field rotatable)
Physical:
Enclosure: 12 mm and 15 mm exterior grade multi-ply hardwood plywood
Suspension Attachment: 6 x M8 points; 1 top, 3 bottom, 2 rear.
Finish: Black DuraFlex™ finish. White (-WH) available upon request.
Optional Weather Resistant Versions5: WRC & WRX available upon request
Grille: Powder coated 16 gauge perforated steel, acoustically transparent foam
Input Connectors: Neutrik Speakon® NL4 (2 wired in parallel), plus CE-compliant covered
Environmental Specifications: Mil-Std 810; IPx3 per IEC529. For higher environmental ratings, use
Dimensions (H x W x D): 679.5 x 238.0 254.0 mm
Weight: 18.6 kg (40.9 lb)
Optional Accessories: MTU-28 U-Bracket
1
On axis SPL measured in far field and referenced to 1 meter by inverse square law. Average from 300 Hz to 16 kHz.
2
Calculated based on system sensitivity and continuous power handling.
3
IEC shaped pink noise, 6 dB crest factor, 100 hour duration.
4
AES standard 2 hour duration, with IEC system noise spectrum.
5
WRC for outdoor placement where the loudspeaker will be sheltered from direct exposure to the elements. WRX for direct exposure
or extreme environments, such as tropical or beach, or in areas with salt air, extreme high humidity or rapid changes in temperatures.
See WRC/WRX configuration sheet for details.
JBL continually engages in research related to product improvement. Changes introduced into existing products without notice are a
routine expression of that philosophy.
2 x JBL 228J, 205 mm (8 in) SFG™ driver with 64 mm (2.5 in) edge wound
voice coil
coil
4 x M8 rear for MultiMount® MM-120-BT.
backing (grille cloth backing on white units)
barrier strip terminals. Barrier terminals accept up to 5.2 sq mm (10
AGW) wire or max width 9 mm (.375 in) spade lugs. NL4’s +1/-1 in
parallel with barrier strip (+2/-2 loop through).
WRC or WRX.
(26.75 x 9.37 x 10 in)
365469-001, M8 x 38mm Tee Knob Thumbscrew Kit for use with
BMB-200k or K&M 195/8 stand mount accessory.
u AC28/26 Compact 2-way Loudspeaker System with 2 - 8” LF
360
-6 dB Beamwidth (degrees)
20
100
Directivity Index (DI), dB
10
10
10
Attenuation (dB)
20000
105
SPL (dB)
AC28/26 V
AC28/26 V 2p
0000
100
Impedance (Ohms)
AC28/26 V
Beamwidth
100
Horizontal
10
Vertical
20 100 1000 1000020000
Frequency (Hz)
Directivity Index, Q
10
0
20 100 1000 1000020000
Frequency (Hz)
Frequency Response, 1W/1m
10
Directivity Factor (Q)
1
Vertical Orientation
Horizontal Off-Axis Frequency Response
0
-10
Attenuation (dB)
-20
-30
20 100 1000 1000020000
Frequency (Hz)
Vertical Up Off-Axis Frequency Response
0 deg
10 deg
20 deg
30 deg
40 deg
50 deg
60 deg
70 deg
80 deg
95
85
75
65
20 100 1000 10000
2 half space
4 free field
Frequency (Hz)
Impedance
10
1
20 100 1000 100002
Frequency (Hz)
0
-10
-20
-30
20 100 1000 1000020000
Frequency (Hz)
0 deg
10 deg
20 deg
30 deg
40 deg
Vertical Down Off-Axis Frequency Response
0
-10
Attenuation (dB)
-20
-30
20 100 1000 1000020000
Frequency (Hz)
Measurements obtained in full passive crossover mode with no signal processin g.
Graphs are from unaltered measured data.
0 deg
10 deg
20 deg
30 deg
40 deg
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