Electro Voice Speaker 405 4T User Manual

405 Series  
4-inch Full-Range  
High Performance  
Ceiling Loudspeakers  
COMMERCIAL  
General Product Description  
The EV (Electro-Voice®) Model 405-8H and 405-4T  
loudspeakers are compact 4" speakers that provide the  
utmost in performance obtainable from speakers of this size.  
Clear, intelligible speech and good music reproduction are  
ensured because of the extended 60 - 15,000 Hz range.  
The loudspeaker has an 8-ohm voice coil.The model 405-4T  
has a factory mounted matching transformer allowing the  
loudspeaker to be run from 70.7 V or 100 V transmission  
lines, drawing 0.5, 1, 2, or 4 watts.  
These quality loudspeakers are designed for continuous,  
trouble-free service. The die cast aluminum frame houses  
a magnetic structure fabricated of heavy gauge steel. The  
small size of the speakers allows either front or rear  
mounting in walls, partitions, ceilings, and into volumes as  
low as 0.1 cubic feet.  
Specifications:  
Voice Coil: ................................................................................ Copper  
Voice Coil Support Material: ............................................. Kapton®**  
Cone Excursion: ........................................ 0.125" max. peak to peak  
Terminals:  
Power Rating: ............. 16 watts continuous pink noise (above 50 Hz)  
Frequency Response: ...................................................60 - 15,000 Hz  
Pressure Sensitivity: ........................................................... 90 dB SPL  
measured at one meter on axis with 1 watt input of pink noise, band-limited  
from 500 - 3000 Hz (Ref.: 20 µPa)  
Speaker :............................... 5.2 mm (0.205 in.) spade lug type  
Transformer: .................................................................... Pigtails  
Mounting Data:  
Maximum SPL: .................................................. 102 dB for 16W @ 1M  
Impedance: .................................................................................8 ohms  
70.7/100 Volt Taps: ................................ 0.5, 1, 2, 4 watts (405-4T only)  
Insertion Loss: ............................................ 1.0 dB max. (405-4T only)  
Transformer Frequency Response: ............... 1 dB, 100 - 10,000 Hz  
........................................................................................... (405-4T only)  
Nominal Free-Air Cone Resonance: ........................................ 120 Hz  
Nominal Distribution Pattern: ......................................................... 90°  
*Distribution Pattern With Polar to Planer Correction:  
107' at 2 kHz 69' at 4 kHz  
Baffle Opening:  
96.8 mm (3.812 in.) diameter (rear mounted)  
104.8 mm (4.125 in.) diameter (front mounted)  
Mounting Bolt Centers:  
4 equally spaced slots 90° apart on 120.7 mm (4.75 in.) diameter  
circle  
Dimensions:  
Diameter: ................................................... 134.9 mm (5.312 in.)  
405-8H: ...............................................54.0 mm (2.125 in.) depth  
405-4T: .............................................103.2 mm (4.063 in.) depth  
Weight:  
Voice Coil Diameter: .................................................. 25.4 mm (1.0 in.)  
Magnet Structure:  
Magnet Type: ....................................................................... Ferrite  
Magnet Weight: ............................................................ 9.4 ounces  
Flux Density: .................................................................. 1.05 tesla  
Construction:  
405-8H: ........................................................ 2 lbs 1 oz. (0.94 kg)  
405-4T: .......................................................... 2 lbs 9 oz. (1.2 kg)  
Color: .......................................................................................... Black  
Frame (Basket):.......... Structurally reinforced die-cast aluminum  
Cone: .......................................................................... Molded fiber  
Cone Suspension: ............................. High-compliance foam surround  
** Kapton® is a registered trademark of DuPont.  
 
Architects’ and Engineers’ Specifications  
MODEL 405-4T  
MODEL 405-8H  
The loudspeaker shall meet the following performance and  
structural criteria.Power rating, 4 watts.Frequency response,  
uniform from 60 to 15,000 Hz.Pressure sensitivity, 90 dB-SPL  
when measured at one meter on axis with 1 watt input of  
bandlimited pink noise from 500 to 300 kHz (Ref.: 20 uPa).  
Impedance, 8 ohms. Nominal free-air cone resonance, 90  
Hz.The voice coil shall have a diameter of 1" and shall operate  
in a magnetic field of 1.05 tesla derived from a ferrite (V)  
magnet weighing at least 9.4 ounces. The loudspeaker shall  
be able to perform efficiently in a volume as low as 0.1 cubic  
feet. The loudspeaker frame shall be of die cast aluminum  
construction.The speaker terminals shall be of the spade lug  
type. Dimensions, 5.312" diameter x 4.063" deep. Weight, 2  
pounds, 9 ounces.  
The loudspeaker shall meet the following performance and  
structural criteria.Power rating, 16 watts.Frequency response,  
uniform from 60 - 15,000 Hz. Pressure sensitivity, 90 dB-SPL  
when measured at one meter on axis with 1 watt input of  
band-limited pink noise from 500 to 3000 Hz (Ref.: 20 µPa).  
Impedance, 8 ohms. Nominal free-air cone resonance, 90  
Hz.The voice coil shall have a diameter of 1" and shall operate  
in a magnetic field of 1.05 tesla derived from a Ferrite (V)  
magnet weighing at least 9.4 ounces. The loudspeaker shall  
be able to perform efficiently in a volume as low as 0.1 cubic  
feet. The loudspeaker frame shall be of die cast aluminum  
construction.The speaker terminals shall be of the spade lug  
type. Dimensions, 5.312" diameter x 2.125" deep. (See page  
2)  
A 70/25-volt line transformer shall be incorporated for use in  
distributed systems, and shall have a frequency response of  
+1 dB from 100 to 10,000 Hz, with maximum insertion loss  
of 1.0 dB and primary wattage taps of 4, 2, 1 and 0.5 watts.  
The loudspeaker shall be the EV (Electro-Voice®) Model  
405-8H.  
The loudspeaker shall be the EV (Electro-Voice®) Model  
405-4T.  
Recommended Connections  
The 405-8H is a nominal 8-ohm impedance loudspeaker with  
a 16-watt input capability.The 405-4T utilizes an 4-watt, 70.7-,  
100-volt universal line-matching transformer with power taps  
ranging from 1 to 4 watts.  
output. The frequency response of a 405 in a typical  
0.5-cubic-foot back enclosure is shown in Figure 1.  
Mounting  
Recommended Enclosures and Baffles  
The 405 may be front or rear mounted against either surface  
of its mounting flange and requires a 110-mm (4.35-in.)  
diameter cutout and a 120-mm (4.72-in.) bolt circle, as shown  
below. Normal fasteners up to 5 mm (0.20 in.) will fit through  
the four holes in the frame.The 405 is designed for mounting  
on standard ceiling speaker baffles.  
The 405-8H, 405-4T are designed to fit on standard 4-inch  
ceiling speaker baffles. Additionally, these loudspeakers will  
accommodate the use of any standard back enclosure with a  
diameter of 5.5 inches or greater and a depth of at least 4.5  
inches. Larger back volumes will increase the low-frequency  
Mounting Dimensions  
405-8H  
134.9 mm (5.312 in.)  
54.0 mm (2.125 in.)  
405-4T  
134.9 mm (5.312 in.)  
103.2 mm (4.063 in.)  
104.8 mm (4.125 in.)  
96.8 mm (3.812 in.)  
A
B
C
D
E
F
Loudspeaker Diameter  
Loudspeaker Depth  
Baffle Opening Diameter (Front Mounted)  
Baffle Opening Diameter (Rear Mounted)  
Bolt Circle Diameter  
104.8 mm (4.125 in.)  
96.8 mm (3.812 in.)  
120.7 mm (4.75 in.)  
120.7 mm (4.75 in.)  
Bolt Hole Slots  
5.2 mm (0.20 in.) x 6.4 mm (0.25 in.)  
5.2 mm (0.20 in.) x 6.4 mm (0.25 in.)  
Dimensions  
 
Frequency Response  
Impedance Response  
Beamwidth vs Frequency  
Directivity and Q  
USA  
12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-884-4051, FAX: 952-884-0043  
Canada  
Switzerland  
Germany  
France  
Australia  
Hong Kong  
Japan  
705 Progress Avenue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: 416-431-4975, 800-881-1685, FAX: 416-431-4588  
Keltenstrasse 11, CH-2563 IPSACH, Switzerland, Phone: 41/32-331-6833. FAX: 41/32-331-1221  
Hirschberger Ring 45, D94315, Straubing, Germany, Phone: 49 9421-706 392, FAX: 49 9421-706 287  
Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: 33/1-6480-0090, FAX: 33/1-6480-4538  
Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: 61/2-9648-3455, FAX: 61/2-9648-5585  
Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: 852-2351-3628, FAX: 852-2351-3329  
2-5-60 Izumi, Suginami-ku,Tokyo, Japan 168, Phone: 81-3-3325-7900, FAX:81-3-3325-7789  
U.S.A. and Canada only.  
For customer orders, contact the Customer Service department at  
800/392-3497 Fax: 800/955-6831  
For warranty repair or service information, contact the Service  
Repair department at 800/685-2606  
Singapore  
Mexico  
UK  
3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: 65-746-8760, FAX: 65-746-1206  
Av. Parque Chapultepec #66-201, Col. EI. Parque Edo. Mex. 53390, Phone: (52) 5358-5434, FAX: (52) 5358-5588  
4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: 44 181 640 9600, FAX: 44 181 646 7084  
Africa, Mid-East 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7424, FAX: 952-887-9212  
Latin America 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7491, FAX: 952-887-9212  
For technical assistance, contact Technical Support at 866/78 AUDIO  
Please refer to the Engineering Data Sheet for warranty information.  
Specifications subject to change without notice.  
© Telex Communications, Inc. 02/2001  
Part Number 38109-934 Rev A  
 

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