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 Pa). 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)

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.

 

Mounting Dimensions

405-8H

405-4T

 

 

 

 

A

Loudspeaker Diameter

134.9 mm (5.312 in.)

134.9 mm (5.312 in.)

 

 

 

 

B

Loudspeaker Depth

54.0 mm (2.125 in.)

103.2 mm (4.063 in.)

 

 

 

 

C

Baffle Opening Diameter (Front Mounted)

104.8 mm (4.125 in.)

104.8 mm (4.125 in.)

 

 

 

 

D

Baffle Opening Diameter (Rear Mounted)

96.8 mm (3.812 in.)

96.8 mm (3.812 in.)

 

 

 

 

E

Bolt Circle Diameter

120.7 mm (4.75 in.)

120.7 mm (4.75 in.)

 

 

 

 

F

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

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Electro-Voice 405-4T, 405-8H specifications Architects’ and Engineers’ Specifications, Recommended Connections, Mounting

405-4T, 405-8H specifications

Electro-Voice is well-regarded in the audio industry for its innovation and quality, and the Electro-Voice 405-8H and 405-4T drivers are prime examples of the brand's commitment to delivering superior sound reproduction. The 405-8H and 405-4T are high-performance compression drivers designed to meet the demands of professional audio applications, including live sound reinforcement and installed sound systems.

The Electro-Voice 405-8H features an impressive 8-ohm impedance, making it compatible with a variety of amplifiers. With a power handling capacity of 250 watts, this driver can deliver excellent sound pressure levels without compromising clarity. The 405-4T, on the other hand, operates at a lower impedance of 4 ohms, which allows for increased power handling, reaching up to 400 watts. This makes the 405-4T particularly suitable for applications where maximum efficiency and output are paramount.

Both models utilize advanced neodymium magnet structures, which contribute to their lightweight design while maintaining high efficiency. This characteristic is especially important for touring applications where weight can significantly impact transportation and setup times. The neodymium magnets also enhance the drivers' magnetic flux, resulting in improved responsiveness and overall performance.

One of the standout features of the 405 series is the patented phase plug design. This technology minimizes phase distortion, ensuring that the sound remains true to the original source across all frequencies. Coupled with a high-frequency response that extends to 20 kHz, these drivers excel in delivering clear, articulate sound even in challenging acoustic environments.

The diaphragm construction is another area where the Electro-Voice 405 drivers shine. They utilize a lightweight yet durable diaphragm material that ensures high sensitivity and quick transient response. This results in a sound output that is both dynamic and detailed, perfect for crisp vocals and intricate instrumentals.

Furthermore, the 405-8H and 405-4T are designed with versatility in mind. They can be integrated into a wide range of cabinets and configurations, making them suitable for various applications, from large concert systems to smaller events. Their robust construction also ensures long-lasting durability, allowing for consistent performance in rigors of touring or permanent installations.

In summary, the Electro-Voice 405-8H and 405-4T drivers represent the culmination of advanced technology and quality craftsmanship. With features such as neodymium magnets, phase plug design, and durable diaphragm materials, they deliver unparalleled sound quality and reliability, making them a top choice for audio professionals worldwide.