Electro-Voice 409-ENGINEERING DA User Manual

General Product Description

The Electro-Voice® 409 series loudspeaker systems are
two-way loudspeakers with 8-inch low-frequency cones
and high temperature voice-coil assemblies coaxially
mounted with wide-dispersion cone tweeters. The dual
magnet construction allows each speaker to be structurally,
magnetically, electrically and mechanically independent of
the other. The 409 series utilize a single section crossover
network, centered at 2500 Hz, providing 6 dB of attenuation
for each element outside the operating range.

The 409-8E is an 8 ohm, 32 watt speaker. The 409-ST (with
15700 transformer) and the 409-4T (with 15704 transformer)
both offer a selection of 0.5, 1, 2 and 4W. The 409-8T (with
15708 transformer) offers a selection of 1, 2, 4 and 8W. The
409-16T (with 15716 transformer) offers 2, 4, 8 and 16W
and the 409-32T (with 15732 transformer) offers a 4, 8, 16,
32W selection.

Architects’ and Engineers’ Specifications

409 Series Loudspeakers. The loudspeaker shall have an
8-inch low-frequency cone and a high temperature voice
coil assembly coaxially mounted with a wide dispersion
cone tweeter. The loudspeaker shall meet the following
criteria. AES power rating shall be 32 watts of band limited
pink noise (85 Hz to 18 kHz, 6 dB crest factor). Frequency
response, uniform from 85 Hz to 18 kHz. Pressure
sensitivity, 97 dB SPL at 1 meter (95 dB at 4 feet) on axis
with one watt of band-limited pink noise from f3 kHz (ref.

409 Series

8-inch Premium

High Performance Ceiling

Loudspeakers

20 uPa). Minimum impedance, 6.0 ohms. The
loudspeaker shall be 8.13 in (20.6 diameter and in (_cm)
deep and shall weigh lbs (_ kg). For dimensions see
next page.

The loudspeakers shall be EV (Electro-Voice®) models
409-8E, 409-ST (with 15700 transformer), 409-4T (with
15704 transformer), 409-8T (with 15708 transformer),
409-16T (with 15716 transformer) and the 409-32T (with
15732 transformer).

COMMERCIAL

Specifications:

Power Rating: ........................... 32 watts, 85 Hz - 18kHz, AES method

Frequency Response: ........................................................ 85 - 18 kHz

Pressure Sensitivity: ........................................................... 97 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: .................................................. 112 dB for 32W @ 1M

Impedance:

Minimum ............................................................................. 6 ohms

Nominal .............................................................................. 8 ohms

Components:

8-inch, high-efficiency, low frequency driver with a coaxially mounted

2.5 inch cone tweeter.

Crossover Network:

Two-way at 2500 Hz with 6 dB per octave tweeter protection

Input Terminals:

Speaker: ................................... 0.212 in. push-on type connectors

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: 206.5 mm (8.13 in.)

Net Shipping

Depth Weight Weight

409-8E 83 mm (3.25 in.) 2.8 lbs (1.3 kg) 3.3 lbs (1.5 kg)

409-ST 98 mm (3.86 in.) 3.1 lbs (1.4 kg) 3.6 lbs (1.6 kg)

4094T 105 mm (4.13 in.) 3.3 lbs (1.5 kg) 3.8 lbs (1.7 kg)

409-8T 114 mm (4.50 in.) 4.0 lbs (1.8 kg) 4.5 lbs (2.0 kg)

409-16T 124 mm (4.86 in.) 4.5 lbs (2.0 kg) 5.0 lbs (2.3 kg)

409-32T 137 mm (5.38 in.) 5.0 lbs (2.3 kg) 5.5 lbs (2.5 kg)

Finish:

Black

Transformer Specifications

Frequency Response:

15700: .................................................... 100 Hz to 10 kHz, +/-1 dB

15704, 15708, 15716, 15732: ................. 50 Hz to 15 kHz, +/-1 dB

Insertion Loss:

15700: .................................................................................... 1.0 dB

15704, 15708, 15716, 15732: ............................................... 0.5 dB

Secondary Impedance: .......................................................... 8 ohms (all)

Primary Impedances and Power Drawn, nominal 70v:

409 Theile-Small Parameters

Free Air Resonance, fs: ......................................................... 90 Hz

Equivalent Volume Compliance, Vas: .................................. 0.61 ft.

Total Q, Qts: ............................................................................. 1.54

Electrical Q, Qes: ..................................................................... 1.78

Mechanical Q, Qms: ............................................................... 11.53

Volume Displacement, VD................................................... 1.95 in

Reference Efficiency: ............................................................ 0.71%

3

3

00751
40751

)W5.0(mhok01)W0.1(mhok5)W0.2(mho0052

)W0.1(mho0005)W0.2(mho0052)W0.4(mho0521

)W0.2(mho0052)W0.4(mho0521)W0.8(mho526)W61(mho213

)W0.4(mho0521)W0.8(mho526)W61(mho213)W23(mho651

807516175123751

)W0.8(mho526

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

)W0.4(mho0521

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
in Figure 7. 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