Data Sheet

ManualsBrandsEV Manuals1515" Woofer

ELECTRO-VOICE

MARK IVMARK IV

MARK IV company

600 Cecil Street, Buchanan, Michigan 49107

MANUFACTURING PLANTS AT BUCHANAN, MI NEWPORT, TN SEVIERVILLE, TN OKLAHOMA CITY, OK GANANOQUE, ONT.

Litho in U.S.A. Part Number 531999 — 9434

provide a new system 3-dB-down point that is

about 0.7 that of the original. To achieve a

similar response extension without equaliza-

tion would require an enclosure at least

twice

the size.

The equalization required is a second-order

underdamped high-pass filter with a Q of 2 at

the enclosure tuning frequency. This charac-

teristic provides a boost of 6 dB at tuning and a

12-dB-per-octave roll-off below. The roll-off pro-

tects the woofer from overexcursion due to

subpassband signals (see below). Note that

the boost does not affect system instantaneous

peak output, which is related only to the

speaker’s displacement ability and effective

diaphragm area.

Pro Sound Facts No. 7, noted earlier, describes

a number of step-down enclosures and the

associated peak boost frequencies for the DL

loudspeaker covered by this engineering data

sheet. The Electro-Voice XEQ-2 and XEQ-3

active crossover/equalizers offer step-down

equalization with a variety of peak-boost fre-

quencies, appropriate for a broad range of

specific systems. XEQ-2 and XEQ-3 engineer-

ing data sheets are available from Electro-

Voice.

SUBPASSBAND SPEAKER PROTECTION

Below the enclosure tuning frequency, cone

excursion increases rapidly. Since acoustic

output is also falling rapidly, there is no utility in

driving the system with signals much below

tuning frequency. While such signals may be in

the program material, they are often extrane-

ous, such as a dropped microphone. The step-

down equalization described in the Step-Down

Operation section provides the required protec-

tion. If step-down equalization is not used, the

Electro-Voice EX-24, XEQ-2 and XEQ-3 elec-

tronic crossover/equalizers can also provide

subpassband protection. The 3-dB-down points

are 30 Hz (EX-24 and XEQ-2) and 16 Hz or 32

Hz (XEQ-3).

Other high-pass filters are available, and one-

third-octave equalizers can also be effective at

providing the required protection.

USE IN MULTIPLES

Cone loudspeakers may be stacked for greater

acoustic output and a narrower beamwidth. (It

is assumed that all cones are operating in

unison or in phase. )

At relatively low frequencies (below about 150

Hz for typical enclosures) stacking produces

additional acoustic output without altering dis-

persion. When a common signal is applied, a 6-

dB increase in maximum acoustic output is

possible.

This increase occurs because the cones “mu-

tually couple,” acting as one cone with twice the

area (therefore, twice the efficiency) and twice

the power-handling capacity of a single cone.

This mutual coupling occurs when the fre-

quency is such that the center-to-center dis-

tance between the two woofer manifolds is less

than about one-half wavelength.

MOUNTING

The DL15X may be front- or rear-mounted

against either surface of its mounting flange

and requires a 353 mm (13.9 in.) diameter

cutout and a 371 mm (14.6 in.) bolt circle.

Normal fasteners up to 6 mm (1/4 in.) will fit

through the eight holes in the frame. Front

mounting is simplest using the optional SMH-1

speaker mounting kit.

ELECTRICAL CONNECTIONS

The DL15X is fitted with a pair of plated, frame-

mounted connectors with color-coded ends.

Electrical connection is made by pushing down,

inserting wire completely through the rectangu-

lar slot and releasing pressure. One conductor

of #9 stranded, #8 AWG solid, a pair of twisted

#15 AWG stranded or a pair of #14 AWG solid

conductors will fit.

AES RECOMMENDED PRACTICE

The DL15X’s specifications conform to the “AES

Recommended Practice for Specification of

Components Used in Professional Audio and

Sound Reinforcement” (AES2-1984/ANSI

S4.26-1984). This recommended practice was

developed over a number of years by consult-

ants, manufacturers and government agencies

from around the world, so that the detailed

performance information required in profes-

sional applications could be provided in a uni-

fied format. The recommended practice has

been published in the October, 1984, issue of

the

Journal of the Audio Engineering Society

(vol. 26, pp. 771-780). Individual copies of the

recommended practice are available from the

Audio Engineering Society, 60 East 42nd Street,

New York, New York 10165, USA. Also ap-

pearing in this issue is an article which com-

ments on the recommended practice from an

engineering point of view (C.A. Henricksen,

“Engineering Justifications for Selected Por-

tions of the AES Recommended Practice for

Specification of Loudspeaker Components,”

pp. 763-769). The comments in this article will

be particularly of interest to those not involved

in the day-to-day design and testing of loud-

speakers.

ARCHITECTS’ AND ENGINEERS’

SPECIFICATIONS

The low frequency woofer shall have a nominal

diameter of 350 mm (15 in.), an overall depth of

165 mm (6.48 in.) and weigh less than 8.6 kg

(19.6 lb). The frame shall be constructed of

strong, deformation-resistant die-cast alumi-

num. The magnet assembly shall incorporate

PROTEF

protection, a TIR

(Thermo Induc-

tive Ring) and FDD

(Flux Demodulation De-

vice) to reduce inductive coupling and increase

power handling. The cone and dust dome should

withstand use in damp and humid conditions.

The voice coil shall have a diameter of 63.5 mm

(2.5 in.), a winding depth of 15.2 mm (0.6 in.)

and be made of edge-wound aluminum ribbon.

The voice-coil former shall be made of aero-

space-grade polyimide laminate and bonded

with high-temperature epoxy adhesives. The

performance specification of a representative

production unit shall be as follows: measured

sensitivity (SPL at 1 m (3.3 ft) with 1 watt input,

100- to 800-Hz pink noise) shall be in excess of

98 dB. The reference efficiency shall be at least

4.63%. The usable response shall be 45 to

3,000 Hz, and the nominal impedance shall be

8 ohms. The EIA rated power shall be 400

watts. The low-frequency transducer shall be

the Electro-Voice DL15X.

UNIFORM LIMITED WARRANTY

Electro-Voice products are guaranteed against

malfunction due to defects in materials or work-

manship for a specified period, as noted in the

individual product-line statement(s) below, or in

the individual product data sheet or owner’s

manual, beginning with the date of original

purchase. If such malfunction occurs during the

specified period, the product will be repaired or

replaced (at our option) without charge. The

product will be returned to the customer pre-

paid. Exclusions and Limitations: The Limited

Warranty does not apply to: (a) exterior finish or

appearance; (b) certain specific items described

in the individual product-line statement(s) be-

low, or in the individual product data sheet or

owner’s manual; (c) malfunction resulting from

use or operation of the product other than as

specified in the product data sheet or owner’s

manual; (d) malfunction resulting from misuse

or abuse of the product; or (e) malfunction

occurring at any time after repairs have been

made to the product by anyone other than

Electro-Voice or any of its authorized service

representatives. Obtaining Warranty Service:

To obtain warranty service, a customer must

deliver the product, prepaid, to Electro-Voice or

any of its authorized service representatives

together with proof of purchase of the product in

the form of a bill of sale or receipted invoice. A

list of authorized service representatives is

available from Electro-Voice at 600 Cecil Street,

Buchanan, MI 49107 (616/695-6831 or 800/

234-6831). Incidental and Consequential

Damages Excluded: Product repair or replace-

ment and return to the customer are the only

remedies provided to the customer. Electro-

Voice shall not be liable for any incidental or

consequential damages including, without limi-

tation, injury to persons or property or loss of

use. Some states do not allow the exclusion or

limitation of incidental or consequential dam-

ages so the above limitation or exclusion may

not apply to you. Other Rights: This warranty

gives you specific legal rights, and you may

also have other rights which vary from state to

state.

Electro-Voice Speakers and Speaker Sys-

tems are guaranteed against malfunction due

to defects in materials or workmanship for a

period of five (5) years from the date of original

purchase. The Limited Warranty does not apply

to burned voice coils or malfunctions such as

cone and/or coil damage resulting from improp-

erly designed enclosures. Electro-Voice active

electronics associated with the speaker sys-

tems are guaranteed for three (3) years from

the date of original purchase. Additional details

are included in the Uniform Limited Warranty

statement.

Service and repair address for this product:

Electro-Voice, Inc., 600 Cecil Street, Buchanan,

Michigan 49107 (616/695-6831 or 800/234-

6831).

Specifications subject to change without no-

tice.