Electro-voice 1828T, 1828C User Manual

1828T

1828C

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.

Convertible Drivers

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).

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

Installation

For use with compound horns, remove both protective plastic caps
and the plastic foam loading plug from the rear. Note: front end is
the one with wiring terminals.

Next, screw the large horn section onto the rear of the driver and
the small section onto the front. Hand tighten to slightly compress
rubber gaskets.

For use with all other horn types, rear cap and foam plug are left in
place and firmly hand tightened with horn attached to the front
directly to the driver terminals.

Transformer Model (1828T)

A transformer and power selection panel is installed in the base of
the housing. Power taps for the transformer are listed in Table 1.

Low-Frequency Driver Protection

When frequencies below the low-frequency cutoff for the horn
assembly are fed to the driver, excessive current may be drawn by
the driver. For protection of driver, amplifier, and transformer (if
driver with built-in transformer is used), capacitor(s) in series with
driver, or transformer primary are recommended. Table 1 indicates

recommended values. The values shown are for 200 Hz. Values
for other frequencies can be determined by using the formula:

C

C

x 200

C =

200

[

f f = New Frequency

For drivers without transformers: 8-ohm driver, 25 V - 100

= Values shown in the following table

200

]

mf

150 Vdc or 150 V non-polarized electrolytic, or two 150 Vdc
electrolytics of two times required value in series, back to back,
for 70 volt lines.

Table 1. Series Protection Capacitors for 200 Hz and Below

seniLtloV-07seniLtloV-52

rewoPecnadepmIecnaticapaCecnadepmIecnaticapaC

W036615

W513332
W85261
W405215.0

fm
fm
fm

fm

W2--2132
W1--5261

W2/1--05215.

--

--

-­6515

fm
fm
fm

fm

Distortion Response - Plane Wave Tube (1 inch)

Figure 1.

(3 watt input)

Figure 3.

Impedance Response - Plane Wave Tube (1 inch)

USA 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
Canada 705 Progress Avenue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: [phone], FAX: [phone]
Switzerland Keltenstrasse 11, CH-2563 IPSACH, Switzerland, Phone: [phone]. FAX: [phone]
Germany Hirschberger Ring 45, D94315, Straubing, Germany, Phone: [phone], FAX: [phone]
France Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: [phone], FAX: [phone]
Australia Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: [phone], FAX: [phone]
Hong Kong Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: [phone], FAX: [phone]
Japan 2-5-60 Izumi, Suginami-ku,Tokyo, Japan 168, Phone: [phone], FAX:[phone]
Singapore 3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: [phone], FAX: [phone]
Mexico Av. Parque Chapultepec #66-201, Col. EI. Parque Edo. Mex. 53390, Phone: [phone], FAX: [phone]
UK 4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: [phone], FAX: [phone]
Africa, Mid-East 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
Latin America 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]

www.electrovoice.com • Telex Communications, Inc. • www.telex.com

© Telex Communications, Inc. 02/2001

Part Number 38109-851 Rev A

Distortion Response - FC100 Horn

Figure 2.

(1 watt / 1 meter)

Figure 4.

Impedance Response - FC100 Horn

For customer orders, contact the Customer Service department at

For warranty repair or service information, contact the Service

For technical assistance, contact Technical Support at 866/78 AUDIO

Please refer to the Engineer ing Data Sheet for warranty information.

800/392-3497 Fax: [phone]

Repair department at 800/685-2606

Specifications subject to change without notice.

U.S.A. and Canada only.