Electro-Voice MTH-1 User Manual

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MTH-1

Biampable,

Mid/High Coaxial Module

Speaker System

• Two-way mid/high horn-loaded

system

• 350-watt long-term power capacity

• Rotatable coaxial mid/high section

• Rugged, road-ready cabinet; metal

grille; black carpet finish

• High "Q" system for increased

intelligibility

• Neutrik Speakon

inputs

• Biampable

• When combined with the MLT-1 or

MTL-1X, forms an MT-1 system

which is a highly efficient and

compact system

Description

The Electro-Voice MTH-1 is a 350-watt,

two-way, constant directivity horn-loaded,

high-efficiency main loudspeaker system.

The system may be biamplified or used full

range with the internal passive crossover.

The MTH-1 mid/high module, combined

with an MTL-1 or MTL-1X low-frequency

system, forms a high-output sound reinforce-

ment for a club, large hall, or outdoor events

in a compact package which can be used eas-

ily by a two-person crew.

The 60° x 40° high- and mid-frequency horns

are coaxially mounted and are easily rotated

together, allowing the horizontal and verti-

cal coverage patterns to be interchanged. The

high “Q” pattern gives increased intelligi-

bility. Combined with the trapezoidal enclo-

sure, the high “Q” and rotatable horns give

many options in placing this versatile enclo-

sure in tight spaces.

The high-frequency section operates above

1,600 Hz. The DH2T compression driver is

coupled to the HP64M 60° x 40° constant-

directivity horn for smooth and extended

high-frequency performance to 16,000 Hz.

The HP64M is a polypropylene horn with ex-

ceptional strength and performance. The

horn/driver combination is securely mounted

to the mid horn by a heavy-duty steel bracket.

The mid-frequency section operates between

160 Hz and 1,600 Hz. This horn-loaded sec-

tion uses a DL10X. A proprietary phase plug

(U.S. Patent No. 4,718,517) is used to ex-

tend the high-end output and blend

seamlessly into the coaxial high-frequency

section.

Crossover

To optimize performance with a low-fre-

quency system, such as the MTL-1, the

MTH-1 should be used in conjunction with

an active crossover with a minimum slope

of 12-dB-per-octave and a crossover fre-

quency of 160 Hz. Due to the high efficiency

of the MTH-1, less amplifier input is needed

to achieve a given sound output level.

Biamping

The MTH-1 can be biamped by removing the

input panel and following the instructions

given. The usable frequency ranges for the

individual sections are 125-2,000 Hz for the

mid-frequency band and 1,200-16,000 Hz for

the high-frequency band. Minimum cross-

over slopes of 12-dB-per-octave are recom-

mended. A protection capacitor with a 3-dB-

down point of 1,100 Hz is in included in the

high-frequency section when in biamp mode.

The usable frequency response of the over-

all biamped system is 125-16,000 Hz, the

same response that is expected with the pas-

sive setup. For maximum performance of the

MTH-1 in a full-range application, the addi-

tion of the MTL-1 low-frequency loud-

speaker system is recommended. This com-

bination forms the MT-1 full-range high-

level sound-reinforcement system. For use

as an MT-1 system, the Electro-V oice's Dx34

Digital Signal Processing unit or XEQ-3

electronic crossover/equalizer/time delay unit

with the EQMT1 plug-in modules may be

used for crossing over the two sections.

Amplifier Power recommendations

As noted in the Power-Handling section,

below, the MTH-1 has a random-noise power

capacity of 350-watts long term (1,400 watts

peak) per EIA RS-426-A 1980. The follow-

ing guidelines will help relate this to an ap-

propriate power amplifier output rating.

1. To use the MTH-1 to full capacity,

skilled experts in sound system installation

and operation will obtain the best results if

the power amplifier is 2.0 to 4.0 times the

long-term average noise power rating of the

MTH-1 Biampable, Mid/High Coaxial Module Speaker System

MTH-1 Biampable, Mid/High Coaxial Module Spealer System

speaker system. For the MTH-1, this is 700

to 2,800 watts.

The caution cannot be made strongly

enough, however, that this arrangement

is only for experts or those who can disci-

pline themselves against “pushing” the

system for ever-higher sound levels and

who can avoid “accidents” such as cata-

strophic feedback or dropped micro-

phones.

2. A more conservative, “normal” ampli-

fier size, which will produce audible results

nearly equal to those of the “expert” recom-

mendation, is 1.0 to 1.4 times the long-term

average noise power rating of the speaker.

For the MTH-1, this is 350 to 490 watts.

3. To be very conservative, one can use an

amplifier rated at 0.5 to 0.7 times the long-

term average noise power rating of the loud-

speaker. For the MTH-1, this is 175 to 245

watts.

Request P.A. Bible Addition No. Two

(“Power- Handling Capacity”) for more

background on these recommendations.

Speaker Protection

A self-resetting high-frequency protection

circuit, Electro-Voice's PRO

™

circuit, is in-

cluded in the MTH-1 to prevent against ac-

cidental overdrive and improve reliability. If

the input power to the high-frequency driver

exceeds the nominal rating, the protection

circuit is activated and reduces the power

delivered to the driver. The system will re-

main in this mode of operation until the in-

put power is reduced to a safe level.

Frequency Response

The MTH-1’s axial frequency response was

measured in Electro-Voice’s large anechoic

chamber at a distance of 3 meters (10 feet)

with a swept sine-wave input. Figure 2 has

been averaged and corrected for 1 watt at 1

meter.

Enclosure Construction

Intended to be used as a portable speaker sys-

tem, the MTH-1 is ruggedly constructed of

3/4-inch, void-free plywood. All joints are

dado cut, and the cabinet is finished with a

densely-woven, abuse-resistant carpet that is

both attractive and highly durable. A full-

length steel grille protects the system from

damage. Large, heavy-duty metal corner pro-

tectors, firmly secured rubber feet, and re-

cessed handles complete the picture, ensur-

ing that the MTH-1 speaker system is ide-

ally suited for a long and reliable life on the

road.

MTH-1 Connections

The MTH-1 is equipped with two paralleled

Neutrik Speakon

NL4MD-V connectors,

selected for their ability to reliably deliver to

the speaker components the high currents

delivered by high-wattage power amplifiers.

The NL4FC is a four-pin mating connector

for the NL4MD-V, and Figure 5 shows how

the usual two-conductor speaker cable

should be wired to pins 1+ and 1– of the con-

nector. Two typical connectors at the power

amplifier end of the cable are shown: banana

and 1/4-inch phone plugs. (The banana plug

provides the more reliable connection.)

Full-range pin arrangements are:

1– = IN (–)

1+ = IN (+)

2– = Not Used

2+ = Not Used

Biamp pin arrangements are:

1– = MB (–)

1+ = MB (+)

2– = HF (–)

2+ = HF (+)

To find your local Neutrik dealer, contact:

Neutrik USA, Inc.

195-S3 Lehigh Ave.

Lakewood, NJ 08701

908/901-9488

Service

In the unlikely event the MTH-1 requires

service, the woofers can be replaced or

serviced from the front. A service data sheet

is available from Electro-Voice.

Power-Handling

The MTH-1 comes in full-range mode. This

switchable to biamp mode. In biamp mode,

the long-term average power-handling ca-

pacity is as follows:

Mid Frequency: 300 watts

High Frequency: 60 watts

Electro-Voice components and systems are

manufactured to exacting standards, ensur-

ing they will hold up, not only through the

most rigorous of power tests, but also through

continued use in arduous, real-life conditions.

The EIA Loudspeaker Power Rating Full

Range (EIA RS-426-A 1980) uses a noise

spectrum which mimics typical music and

tests the thermal and mechanical capabili-

ties of the components. Electro-Voice will

support relevant additional standards as and

when they become available. Extreme, in-

house power tests, which push the perfor-

mance boundaries of the woofers, are also

performed and passed to ensure years of

trouble-free service.

Specifically, the MTL-1 passes EIA RS-426-

A 1980 with the following values:

= 7.6 (1.15 x R

)

E(MAX)

= 350 watts

Test voltage = 51.5 volts rms,

103.1 volts peak

The “peak” power-handling capacity of a sys-

tem is determined by the peak test voltage

amount. For the MTH-1, a 103.1-volt peak

test voltage translates into 1,400-watts short-

term peak power-handling capacity. This is

the equivalent of four times the “average”

power-handling capacity, and is a peak that

can be sustained for only a few milliseconds.

However, this sort of short duration peak is

very typical in speech and music. Provided

the amplifier can reproduce the signal accu-

rately, without clipping, the system will also

perform accurately and reliably, even at these

levels.

Suspending MTH-1 Enclosures

The MTL-1 has been developed in conjunc-

tion with the HSMT-1 series of hanging hard-

ware. The HSMT-1 kit allows the MTH-1

to be hung safely in a variety of orientations.

The combination of the HSMT-1 kit and

MTL-1 enclosure has been certified by an

independent structural engineer to be safe

and secure. Each HSMT-1 kit consists of a

tube, two brackets, two eyebolys and the nec-

essary fasteners. The installer must assemble

the HSMT-1 kit by first drilling two holes in

MTH-1 Biampable, Mid/High Coaxial Module Speaker System

MTH-1 Biampable, Mid/High Coaxial Module Spealer System

to the MTH-1 enclosure, in predefined posi-

tions, and then screwing the brackets onto

the steel tube, which passes through the en-

closure. Full instructions are included with

each HSMT-1 kit. A single MTH-1 requires

two HSMT-1's to suspend it horizontally or

vertically, both singly and in multiples.

A maximum of two cabinets can be sus-

pended in this manner. Vertical is defined

by having the central EV logo in its correct

orientation as delivered, although the logo

is rotatable to allow it to remain upright in

either rotation. Full attention must be given

to the instructions and limitations in the

HSMT-1 kit instruction sheet.

Architects' and Engineers'

Specifications

The loudspeaker shall be a horn-loaded type.

The mid frequencies shall be reproduced with

one 300-watt (EIA RS-426-A 1980) DL10X

254-mm (10-in.) woofer mounted on a

60° x 40° constant-directivity horn. The sys-

tem will reproduce the frequencies from 160

to 16,000 Hz. The system shall be capable

of producing average sound levels in excess

of 130 dB in the long term, and short-term

peaks of 136 dB.

The enclosure shall be constructed of black,

carpeted, multilayer plywood and have a

metal grille which attaches with four screws.

The dimensions shall be 591 mm (23.3 in.)

tall, 572 mm (22.5 in.) wide, and 758 mm

(29.9 in.) deep. The system shall weigh

43.1 kg (95 lb).

The loudspeaker system shall be the

Electro-Voice MTH-1.

Limited Warranty

Electro-Voice products are guaranteed

against malfunction due to defects in mate-

rials or workmanship for a specified period,

as noted in the individual product-line

statement(s) below, or in the individual prod-

uct data sheet or owner’s manual, beginning

with the date of original purchase. If such

malfunction occurs during the specified pe-

riod, the product will be repaired or replaced

(at our option) without charge. The product

will be returned to the customer prepaid.

Exclusions and Limitations: The Limited

W arranty does not apply to: (a) exterior fin-

ish or appearance; (b) certain specific items

described in the individual product-line

statement(s) below, or in the individual prod-

uct data sheet or owner’s manual; (c) mal-

function 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 Service or any of its authorized ser-

vice representatives. Obtaining Warranty

Service: To obtain warranty service, a cus-

tomer must deliver the product, prepaid, to

Electro-Voice Service or any of its autho-

rized 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 avail-

able from Electro-V oice Service at 600 Cecil

Street, Buchanan, MI 49107 (800/234/6831

or FAX 616/695/4743). Incidental and

Consequential Damages Excluded: Prod-

uct repair or replacement and return to the

customer are the only remedies provided to

the customer. Electro-Voice shall not be li-

able for any incidental or consequential dam-

ages including, without limitation, injury to

persons or property or loss of use. Some

states do not allow the exclusion or limita-

tion of incidental or consequential damages

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-V oice 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 origi-

nal purchase. The Limited W arranty does not

apply to burned voice coils or malfunctions

such as cone and/or coil damage resulting

from improperly designed enclosures.

Electro-Voice active electronics associated

with the speaker systems are guaranteed for

three (3) years from the date of original pur-

chase. Additional details are included in the

Uniform Limited Warranty statement.

Electro-Voice Electronics are guaranteed

against malfunction due to defects in mate-

rials or workmanship for a period of three

(3) years from the date of original purchase.

Additional details are included in the Uni-

form Limited W arranty statement.

For warranty repair, service information, or

a listing of the repair facilities nearest you,

contact the service repair department at: 616/

695-6831 or 800/685-2606.

For technical assistance, contact Technical

Support at 800/234-6831 or 616/695-6831,

M-F, 8:00 a.m. to 5:00 p.m. Eastern Stan-

dard time.

Specifications subject to change without no-

tice.