Electro-Voice T18 - User Manual

T18
Subwoofer
• DL18MT Manifold Technology
TM
woofer for reliable, extended low-
frequency output
• Subwoofer for augmenting the
low-frequency performance of
EV stage systems
• Natural high-frequency roll-off
• 400-watt long-term power capacity
• Rugged, road-ready cabinet; metal
grille; black carpet finish
• Neutrik Speakon
®
and
1
/
4
-inch phone
jack inputs
•1
3
/
8
-inch stand mount in top allows
use of satellite system
Impedance,
Nominal:
8 ohms
Minimum:
6.6 ohms
Input Connectors:
Two Neutrik Speakon
®
NL4MPR-V and two
1
/
4
-in. phone jacks, all in parallel
Supplied Accessory:
Neutrik Speakon
®
NL4FC input cable
connector
Mounting:
Top surface contains stand mount
receptacle for use with satellite speaker
system
Materials,
Enclosure:
Black, carpet-covered
3
/
4
-in. void-free
plywood
Grille:
Black perforated metal
Enclosure Dimensions (see Figure 3),
Height:
83.3 cm (32.8 in.)
Width:
63.0 cm (24.8 in.)
Depth:
60.9 cm (24.0 in.)
Shipping Dimensions,
Height:
86.4 cm (34.0 in.)
Width:
65.5 cm (25.8 in.)
Depth:
65.5 cm (25.8 in.)
Net Weight:
49.4 kg (109 lb)
Shipping Weight:
54.0 kg (119 lb)
DESCRIPTION
The Electro-Voice T18 is a 400-watt subwoofer
loudspeaker system which combines the at-
tributes of both horn-loaded and vented-box
designs. It utilizes the unique SubScoop
TM
cabi-
net construction with a newly revised DL18MT
woofer, as used in the Manifold Technology
®
concert systems. The design behaves like a
horn over much of its range, but without the time
delay and weight problems usually associated
with conventional designs. Vented-box prin-
ciples take over for the lowest octave and assist
in producing exceptionally high levels of clean,
punchy bass from a subcompact box. The
reverse woofer orientation has been used to
optimize the rear chamber volume and de-
crease the horn flare rate for extended low-end
performance.
The T18 can be used to augment the bass
performance of any Electro-Voice stage sys-
tem. (This may involve the use of appropriate
electronics and crossovers.) A 1
3
/
8
-in. stand-
mount receptacle on the top surface of the T18
allows satellite speaker systems such as the
T52 and T22 to be used (see Figure 4).
USE IN MULTIPLES
The T18 may be used in multiples to increase
acoustic output. A 6-dB increase in maximum
acoustic output occurs when two speaker sys-
tems are placed side by side and paralleled,
yielding a 4-ohm load. For operation at very-low
frequencies, the woofer cones “mutually couple,”
acting as one system with twice the effective
cone area and power-handling capacity of a
single system. Increasing the cone area doubles
the efficiency, providing a 3-dB increase in
sound pressure level. The doubled power ca-
pacity provides the potential for an additional
3-dB gain in maximum acoustic output.
SPECIFICATIONS
Typical Axial Frequency Response (swept
one-third-octave pink noise, anechoic
environment, 4 volts at 10 feet, normalized
for 1 watt/1meter; see Figure 1):
45-250 Hz
Low-Frequency 3-dB-Down Point:
45 Hz
Usable Low-Frequency Limit
(10-dB-Down Point):
33 Hz
Half-Space Reference Efficiency:
6.0%
Long-Term Average Power-Handling
Capacity per ANSI/EIA RS-426-A 1980
(see Power-Handling Capacity section):
400 watts
Maximum Woofer Acoustic Output:
24 watts
Sensitivity (SPL at 1 meter, 1 watt input,
anechoic environment, band-limited pink
noise signal, 50 to 200 Hz):
99 dB
Dispersion Angle Included by 6-dB-Down
Points on Polar Responses:
Essentially omnidirectional
Distortion, 0.1 Full Power Input (see
Figure 2),
Second Harmonic,
100 Hz: –52 dB, 0.25%
Third Harmonic,
100 Hz: –44 dB, 0.63%
Transducer Complement:
DL18MT
Box Tuning Frequency:
38 Hz
Recommended Crossover Frequency:
250 Hz or below
Recommended Crossover Slope:
12 dB per octave

Summary

Subwoofer Specifications and Description

Technical Specifications Overview

Details key performance metrics including frequency response, sensitivity, power handling, and impedance.

Product Description and Design

Explains the T18 subwoofer's horn-loaded and vented-box design, DL18MT woofer, and road-ready features.

Using Multiple Subwoofers

Discusses benefits of using multiple T18 units for increased acoustic output and mutual coupling.

Technical Details and Operation

Crossovers and Amplifiers

Recommends active crossovers and suitable amplifiers for optimal T18 subwoofer performance.

Speaker Protection

Advises using a high-pass filter to protect the T18 and maximize output below tuning frequency.

Enclosure Construction

Describes the robust, carpet-covered plywood cabinet with protective metal grille and hardware.

Connections and Wiring

Details the Neutrik Speakon and 1/4-inch phone jack inputs and recommended cable configurations.

Using with Satellite Systems

Explains how to use the built-in stand mount for satellite speakers and safety guidelines.

Power Handling Test

Details the ANSI/EIA RS-426-A 1980 power handling capacity and test voltage for the T18.

Architects and Engineers Specifications

System Requirements

Specifies horn-loaded design, DL18MT woofer, frequency range, output levels, and enclosure materials.

Mounting and System Name

Details the 13/8-in. stand mount and identifies the system as the Electro-Voice T18 subwoofer.

Uniform Limited Warranty

Warranty Coverage and Duration

Covers defects in materials/workmanship for 5 years for speakers, 3 years for electronics.

Exclusions and Limitations

Lists exclusions such as exterior finish, misuse, unauthorized repairs, and incidental damages.

Obtaining Warranty Service

Procedure for obtaining service including proof of purchase and shipping instructions.

Electro-Voice T18 Specifications

General

Type	Subwoofer
System Power Handling (Continuous/Program/Peak)	400 W / 800 W / 1600 W
Nominal Impedance	8 ohms
LF Transducer	18 in (457 mm) woofer
Connectors	Neutrik Speakon NL4MP
Enclosure Material	Plywood
Grille	Steel
Axial Sensitivity	98 dB (1W/1m)