Electro-Voice MM2 User manual

MM2
MM2F
Submergence-Proof
Speakers
General Product Description
The Models MM2 and MM2F are submergence-proof
speakers rated at 25 watts, for use in public address or paging
applications.
The drivers employ a diaphragm with a phenolic impregnated
linen-base and 2.0-inch voice coil, with a “W” shaped Alnico
V magnet structure.
The MM2 is equipped with a serrated swivel mounting bracket
and the MM2F is made with six holes in its outer flange for
flush mounting.
The voice-coil/diaphragm assembly is protected by a special
anti-fungicide treatment and is easily accessible for cleaning
by removal of the diecast reflector on the front of the speaker.
The MM2 (MM2F) is self-draining and designed to withstand
fungus, dust, salt spray, live steam, and gases. It is built to
penetrate high noise levels in boiler rooms, mines, railroads,
etc.
Architects’ and Engineers’ Specifications
The loudspeaker shall be integral driver and
submergence-proof speaker with a phenolic impregnated
linen-base diaphragm and rugged two-inch voice coil.
The axial frequency response will extend from 800 to 5,000
Hz and the horn shall exhibit a low-frequency cutoff of 600
Hz. Sound pressure level will be 104 dB (1 W/1 M) with an
800 to 5,000 Hz pink noise signal applied. Dispersion shall
be 82° for the MM2/MM2F.
Outer housing shall be spun aluminum and center assembly
of diecast aluminum. All metal parts of speaker shall be of
anodized aluminum with baked-on acrylic for maximum
protection.
Specifications:
Frequency Response: ................................. 800-5,000 Hz ±5 dB
Power Handling, 8 Hours, 6 dB Crest Factor:
............................................... 25 watts (500-5,000 Hz pink noise)
Impedance: ..................................................... Nominal: 16 ohms
Sound Pressure Level at 1 Meter, 1 Watt Input Averaged, Pink
Noise Band-Limited from 500 to 5,000 Hz:
............................................................................................ 104 dB
Horizontal Beamwidth:
............................... 82° @ 2 kHz (see Figure 2)
Vertical Beamwidth:
............................... 82° @ 2 kHz (see Figure 2)
Directivity Factor Rθ θ
θ θ
θ (Q): ..................................... 10.25 @ 2 kHz
Usable Low-Frequency Limit: ......................................... 600 Hz
Construction:
Heavy-gauge spun aluminum case and die-cast aluminum
center assembly. All metal speaker parts are of anodized
aluminum with baked-on acrylic paint. Diaphragm is phenolic
impregnated linen-base.
Voice-Coil Diameter: ............................................ 5.1 cm (2.0 in.)
Magnet Weight: .................................0.93 kg (0.42 lb) with plates
Magnet Material: ............................................................. Alnico V
Flux Density: ............................................................... 1.30 Tesla
Dimensions:
Diameter:
MM2 .................................................... 15.2 cm (6.0 in.)
MM2F ................................................. 18.4 cm (7.3 in.)
Depth:
MM2 .................................................... 12.8 cm (5.0 in.)
MM2F ................................................... 9.5 cm (3.8 in.)
Net Weight:
MM2 ........................................................ 2.4 kg (5.3 lb)
MM2F ..................................................... 2.8 kg (6.0 lb)
Shipping Weight:
MM2 ........................................................ 2.8 kg (6.0 lb)
MM2F ..................................................... 4.1 kg (9.0 lb)
COMMERCIAL
Mounting of the MM2 shall be by means of a swivel bracket
capable of at least 90° vertical adjustment.
Mounting of the MM2F shall be by means of six 7/32 inch
diameter holes around a 6.625 inch diameter circle on the
flange.
MM2 dimensions shall be 15.2 cm (6.0 in.) in diameter, by
12.8 cm (5.0 in.) deep. Net weight shall not exceed 2.4 kg
(5.3 lb). The loudspeaker shall be the MM2.
MM2F dimensions shall be 18.4 cm (7.3 in.) in diameter, by
9.5 cm (3.8 in.) deep. Net weight shall not exceed 2.8 kg
(6.0 lb). The loudspeaker shall be the MM2F.

USA 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-88 - 051, FAX: [phone]
Canada 705 Progress Avenue, Unit 6,Scarborough, Ontario, Canada, M1 H2 X1,Phone: [phone].FAX: [phone]
Switzerland Keltenstrasse 11, CH-2663 IPSACH, Switzerland, Phone: [phone]. FAX: [phone]
Germany Hirschberger Ring 5, 09 315, Shooting, Germany, Phone: [phone], Fax: [phone]
France Parc de Courcerin, Alice Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: [phone], FAX: [phone]
Australia Unit 23, Block C. Slough Business Park, Slough Avenue, Silverwater, N S.W. 2128, Australia, Phone: [phone], FAX: [phone]
Hong Kong Unit E & F, 211F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong. Kowloon, Hong Kong, Phone: [phone], FAX: [phone]
Japan 2-5-601zumi,Suginami-ku,Tokyo,Japan 168,Phone:[phone],FAX:[phone]
Singapore 3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 08705, Phone: [phone], FAX: [phone]
Mexico Av.Parque Chapultepec #66-201, Col. FI.Parque Edo Mex.53390, Phone: [phone] . FAX: [phone]
UK , The Willows Centre, Wdlow Lane, Mitcham, Surrey CR 1 UK, Phone: [phone], FAX: [phone]
Africa Mid-East 12000 Portland Ave South, Burnsville, MN 55337, Phone:[phone] , FAX: [phone]
Latin America 120011 Portland Ave South, Burnsville, MN 55337, Phone:[phone], FAX: 952-887, 9212
www.electrovoice.com • Telex Communications, Inc. • www.telex.com
© Telex Communications, Inc. 02/2001
Part Number 38109-846 Rev A
U.S.A. and Canada only.
For customer orders contact the Customer Service department at
800/392-3497 Fax: [phone]
For warranty repair or service information contact the Service
Repair department at 800/685-2606
For technical assistance contact Technical Support at 1(866)78AUDIO
Please refer to the Engineering Data Sheet for warranty information.
Specifications subject to change without notice.
Installation
MM2
A serrated swivel mounting bracket with locking nut is furnished for
installing the MM2 and is designed so the speaker can be moved
through an angle of at least 90°. Three mounting holes are present
in the base of the mount.
MM2F
The MM2F is provided with six mounting holes 7/32 inch in diameter
around a 6.625 inch circle, to be installed behind a 6-1/8 inch
diameter hole.
Directional Performance
The directional characteristics of the MM2/MM2F were measured
by running a set of polar responses in a large anechoic chamber.
The test signal was 1/3-octave-band-limited pseudo-random pink
noise centered at the ISO standard frequencies indicated in Fig. 1.
Additional typical data is provided in Figure 2 that indicates 6 dB-
down beamwidth versus frequency for the MM2/MM2F.
Frequency Response
Figure 3 shows the axial frequency response of the MM2/MM2F. It
was measured at a distance of 1 meter, using a swept sine wave.
Low-Frequency Driver Protection
When frequencies below the low-frequency cutoff for the horn
assembly are fed to the driver, excessive current may be drawn by
the driver. For protection of the driver and amplifier, a capacitor in
series with driver is recommended.
For drivers without transformers:
16-ohm driver 25 V - 100 mf
150 Vdc or 150 V non-polarized electrolytic, or two 150 V electrolytics
of two times required value in series, back to back, for 70-volt lines.
Figure 1
MM2F Polar Response
Figure 2
MM2F Beamwidth vs. Frequency
Figure 3
MM2F Frequency Response (1 watt at 1 meter)