1828T
1828C
Convertible Drivers
General Product Description
The 1828T and 1828C are heavy-duty convertible drivers
for use in medium power public address installations.
The drivers have rugged phenolic diaphragms, 1.5 inch
diameter voice coils, and “rim centered” ferrite magnet
structures for long life and reliability under extreme operating
conditions.
The transformer model (1828T) includes connections for
70V/25V distributed systems and a power tap select panel.
The exterior is finished in durable waterproof paint, and all
metal parts have been treated for resistance to high humidity
and fungus.
Ideal for both indoor and outdoor applications, these drivers
are well suited for any installation requiring rugged and
reliable performance.
Architects’ and Engineers’ Specifications
The loudspeaker(s) shall be of the compression-driver type
having a rugged phenolic diaphragm and a high-temperature
rated one and one-half inch voice coil.
The loudspeaker(s) shall exhibit essentially flat power
response from 400 to 3,000 Hz with a smoothly rolled-off
response beyond. Their sensitivity, when mounted on a
FC100 horn, will be 105 dB (1 W/1 M) with a 500 to 5,000
Hz pink noise signal applied.
The loudspeaker(s) will be capable of handling a 30 watt,
500 to 5,000 Hz pink noise signal with a 6 dB crest factor for
a period of eight hours.
Specifications:
Frequency Response:
............................................ 260 -10,000 Hz ±5 d8 (see Figure 2)
Power Handling, 8 Hours, 6 dB Crest Factor:
............................................... 30 watts (500-5,000 Hz pink noise)
Impedance, Nominal:
...................................................... 8 ohms
Minimum:
............................. 6.5 ohms (FC100 horn)
Sound Pressure Level at 1 Meter, 1 Watt Input Averaged, Pink
Noise Band-Limited from 300-3,000 Hz:
.................................................................... 105 dB (FC100 horn)
Voice Coil Diameter:
........................................ 3.81 cm (1.50 in.)
Magnet Weight:
................................................... 0.28 kg (0.62 lb)
Magnet Material:
................................................ Strontium ferrite
Flux Density:
............................................................... 1.25 Tesla
Construction:
Rugged weatherproof finish for outdoor use
Mechanical Construction of Driver:
1-3/8"-18 x 7/8”- long thread allows the 1828 to be mounted
on any horn
Dimensions, 1828T:
Height: ................................................. 12.7 cm (5.0 in.)
Width: .................................................. 10.2 cm (4.0 in.)
Depth: .................................................. 13.3 cm (5.3 in.)
Dimensions 1828C:
Diameter: ............................................... 8.3 cm (3.3 in.)
Height: ................................................. 10.2 cm (4.0 in.)
Net Weight:
1828T: ..................................................... 2.3 kg (5.0 lb)
1828C: ..................................................... 2.2 kg (4.7 lb)
Shipping Weight:
1828T: ...................................................... 2.5 kg (5.5 lb)
1828C ..................................................... 2.4 kg (5.2 lb)
Recommended Horns:
FC100
Cobreflex IIB
Cobreflex III
COMMERCIAL
The 1828T shall have a height of 12.7 cm (5.0 in.), a width
of 10.2 cm (4.0 in.), and a depth of 13.3 cm (5.2 in.).
The 1828C shall have a diameter of 8.31 cm (3.3 in.), and a
height of 10.2 cm (4.0 in.). Both shall have a throat opening
of 2.54 cm (1 .0 in.) with a 1-3/8”-18 thread for mounting.
The loudspeakers are the 1828T which includes a 70V/25V
line matching transformer (see Table 1) and weighs no more
than 2.3 kg (5 lb), and the University Sound 1828C, which
has a nominal impedance of 8 ohms and weighs no more
than 2.2 kg (4.7 lb).
