Electro-Voice 405-8H, 405-4T User Manual

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.

405 Series

4-inch Full-Range

High Performance

Ceiling Loudspeakers

COMMERCIAL

Specifications:

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)

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

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:

Frame (Basket): .......... Structurally reinforced die-cast aluminum

Cone: .......................................................................... Molded fiber

Cone Suspension: ............................. High-compliance foam surround

Voice Coil: ................................................................................ Copper

Voice Coil Support Material: ............................................. Kapton®**

Cone Excursion: ........................................ 0.125" max. peak to peak

Terminals:

Speaker : ............................... 5.2 mm (0.205 in.) spade lug type

Transformer: .................................................................... Pigtails

Mounting Data: 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:

405-8H: ........................................................ 2 lbs 1 oz. (0.94 kg)

405-4T: .......................................................... 2 lbs 9 oz. (1.2 kg)

Color: .......................................................................................... Black

** Kapton® is a registered trademark of DuPont.

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Architects’ and Engineers’ Specifications

MODEL 405-8H

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

The loudspeaker shall be the EV (Electro-Voice®) Model 405-8H.

MODEL 405-4T

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.

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 405-4T.

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.

Recommended Enclosures and 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

output. The frequency response of a 405 in a typical

0.5-cubic-foot back enclosure is shown in Figure 1.

Mounting

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.

Dimensions

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