Control®28T-60 High Output Indoor/Outdoor
Isolation transformer for
Components: 8” Polypropylene
coated woofer, 1” Titanium coated
horn loaded tweeter
Built-in InvisiBall ® mounting
Weather resistant enclosure and
90° x 90° high frequency horn
Overload Protection Circuitry
The Control® 28T is the largest of
JBL Professional’s Control Contractor
Series indoor/outdoor loudspeakers.
Its rich sonic character makes the
Control® 28T a perfect choice for
restaurants, health clubs, under balcony,
outdoor theme & water parks,
or other applications where foreground/
background music and paging
are required. The Control 28T can
be used in either 70.7V or 100V
distributed-line sound systems. Taps
are provided at 60W, 30W and 15W
(plus a 7.5W tap for use on 70.7V
The unique InvisiBall mounting
hardware is included in each system
and makes short work of permanent
installation. The InvisiBall mounting
method adds the benefit of vertical
rotation of up to ±37° and horizontal
rotation of up to ±44°. Because
InvisiBall adjustments are made
through a hidden access behind the
logo badge, the grill never needs to
be removed, while providing a high
degree of theft deterrence as well.
Weather resistance is maximized by
coating the woofer cone in
polypropylene and terminating its circumference
in JBL’s WeatherEdge™, a
seamless, rubberized extension of the
woofer surround that provides added
protection to critical transducer elements.
The polycarbonate tweeter
diaphragm is reinforced with a thin
film of titanium for added rigidity and
endurance against sun, salt and moisture.
Zinc plated grilles resist rusting
in the harshest conditions.
Available in black (Control 28T-60) and white (Control 28T-60-WH). The
Control® 28T readily accepts a variety of paints and finishes to match any
Control® 28T-60 High Output, Indoor/Outdoor, Background/Foreground Speaker
Frequency Response in half-space
with 70.7V input, taps #1 through
#4. For 100V input, raise each
curve 3 dB. Beamwidth
Horizontal Off Axis Frequency Response
Vertical Off Axis Frequency Response (up)
Vertical Off Axis Frequency Response (down)
Horizontal 1/3 Octave Polars
The loudspeaker shall consist of a 200mm (8 in) low frequency transducer,
25mm (1 in) high frequency transducer, and frequency dividing
network installed in a ported enclosure. The low frequency voice coil
shall be 32 mm (1-1/4 in) in diameter.
Performance specifications of a typical production unit shall be as follows:
Usable frequency response shall extend from 55 Hz to 15 kHz
(10 dB below rated sensitivity, in half-space, with no external equalization).
The loudspeaker shall be equipped with a transformer for use in
either 70.7V or 100V distributed-line sound systems with taps selectable
by rotary switch. Taps shall be nominally 7.5W @ 70V (15W @ 100V),
15W @ 70V (30W @ 100V), 30W @ 70V (60W @ 100V), and 60W @ 70V
(not used @ 100V). The frequency dividing network shall have a
crossover frequency of 2.8 kHz. Rated power capacity shall be at least
175 watts continuous program power, defined as 3dB above a test signal
of filtered random noise conforming to international standard IEC268-5
(shaped pink noise with a peak-to-average ratio of 6dB), for 100 continuous
The system shall be protected against damage from occassional overpowering
via full range series lamps that limits the power to the network
and transducers. The high frequency transducer shall be hornloaded
to more evenly cover a nominal 90° horizontal by 90° vertical
The enclosure shall be constructed of high-impact polystyrene for protection
against the elements in outdoor applications, and for paintability.
The grille shall be completely zinc-coated for resistance against rusting,
shall be bake-painted black, and shall be secured via screws to keep it
in place when facing downward.
The low frequency transducer shall have a polypropelene cone and a
butyl rubber surround which shall extend seamlessly over the edge of
the speaker frame for protection against the elements. The high frequency
transducer shall be constructed of polycarbonate, reinforced with a
titanium film for additional weather resistance. The system shall withstand
Mil Spec 810 testing with specified time durations for exposure to
the following environments with no effect on its acoustical performance
or structural integrity: salt spray (method 509.3), temperature -19°C to
49°C (method 501.3 and 502.3), 95% humidity (method 507.3) and ultraviolet
The system shall have a IEC 529 splashproof
rating of IP-X4.
For theft deterrence, the installation access area shall be hidden
behind a snap-out cover, and the access area shall be on the front of the
loudspeaker for ease of installation and adjustment. The loudspeaker
shall be rotatable over a minimum of ±35° in all directions via a balltype
mounting system. The ball mechanism shall be internal to the cabinet
to allow low-profile mounting and better stability via a short moment
arm. The logo shall be rotatable for proper orientation when the loudspeaker
is mounted horizontally or vertically.
The external wiring connectors shall be spring loaded and gold plated,
and shall accept bare wire, single or dual banana-type connectors
with 19 mm (3/4 in) spacing. Overall cabinet dimensions shall be no
greater than 380 mm (15.0 in) high by 280 mm (11.0 in) wide by 220
mm (8.6 in) deep and shall weigh no more than 6.5 kg (14.3 lbs).
The finish shall be a paintable lighly textured black.
The system shall be the JBL Model Control 28T-60 with included
InvisiballTM mounting system.