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Figure 1, One-Third-Octave Polar Response Charts
Measurements were made in a 1.5 ft
3
closed enclosure.
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.
Wiring Diagam
T4-504
V07V001
W0.4
nworBdeR
W0.2
deRegnarO
W0.1
egnarOwolleY
W5.0
wolleYA/N
nommoC
kcalBkcalB
smhO8
etihWetihW
nommoC
kcalBkcalB
Dimensions
snoisnemiDgnitnuoMH8-504T4-504
A
retemaiDrekaepsduoL).ni213.5(mm9.431).ni213.5(mm9.431
B
htpeDrekaepsduoL).ni521.2(mm0.45).ni360.4(mm2.301
C
)detnuoMtnorF(retemaiDgninepOelffaB ).ni521.4(mm8.401).ni521.4(mm8.401
D
)detnuoMraeR(retemaiDgninepOelffaB).ni218.3(mm8.69).ni218.3(mm8.69
E
retemaiDelcriCtloB).ni57.4(mm7.021).ni57.4(mm7.021
F
stolSeloHtloB).ni52.0(mm4.6x).ni02.0(mm2.5 ).ni52.0(mm4.6x).ni02.0(mm2.5
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
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.