Electro-Voice MH660P Specifications

SPECIFICATIONS
Typical Axial Frequency Response (swept
one-third-octave plnk noise, anecholc
envlronment, 4 volts at 10 feet, normalized
for 1 watt, 1 meter into mld-bass driver;
see Figure 1):
150-20,000 Hz
Low-Frequency 3-dB-Down Point:
150 Hz
Usable Low-Frequency Limit (10-dB-down
point):
140 Hz
Recommended Crossover Frequencies:
160 Hz, 1,600 Hz
Crossover Slopes per Octave, Suggested:
24 dB
Recommended Signal Delay,
Mid Bass: 0.00 msec
High Frequency: 0.60 msec
Long-Term Average Power-Handling
Capacity (see Power Handling section),
Mid Bass
(per ANSl/ElA RS-426-A):
300 watts
High Frequency
(per AES2-1984/ANSI S4.26-1984):
60 watts
Sensitivity (SPL at 1 meter, 1 watt input,
anechoic environment, band-limlted pink-
noise signal),
Mid Bass: 107 dB
High Frequency: 111 dB
Impedance,
Nominal (mid bass/high frequency):
16 ohms/8 ohms
Minimum (mid bass/high frequency):
11 ohms/6 ohms
Average Efficiency,
Mid Bass:
25%
High Frequency:
25%
Maximum Long-Term Average Mid-Band
Acoustic Output:
75 watts
Beamwidth (angle Included by 6-dB-down
points on polar responses, Indicated one-
third-octave bands of pink noise; see
Figure 2), 600 to 20,000 Hz Horizontal or
Vertical:
60 degrees +/- 25
Directivity Factor R, (a), 500- to 20,000-Hz
Median (see Figure 3):
18.2
Directivity Index D,, 500- to 20,000-Hz
Median (see Figure 3):
12.6 dB (+3.8 dB, -4.0 dB)
Distortion (120 dB SPL at 1 meter from
mid-bass horn uslng typlcal music
spectrum; see Figure 4),
Second Harmonic,
1,000 Hz: less than 1%
10,000 Hz: less than 1%
Third Harmonic,
1,000 Hz: less than 1%
10,000 Hz: less than 1%
Transducer Complement,
Mid Bass:
DL10X-SH 25.4-cm (10-in.) driver with
K e v l a r epoxy composite cone on
rotatable MH660 6 0 x 60 degree horn
High Frequency:
DH2As2 compression driver on HP66
6 0 x 6 0 degree horn coaxially mounted
to a mid-bass horn
Polarity (all drivers):
A positive voltage applied to the positively
marked input terminal produces a positive
acoustic pressure at the front of the system
1. Kevlar is a registered trademark of DuPont.
MH660C
Coaxial Constant-
Directivity Horn System
High-output high-quality music and
speech for stadiums and performing-arts
venues
Large, correctly sized horn mouths
provide uniform directivity control to
500 Hz, for Increased intelligibility under
difficult acoustic conditions
High "Q" for increased intelligibility
Suspension system for safe and easy
installation
DH2As2 2-inch compression driver for
extended high-frequency performance
Short throw/fill-in when used with the
very-large-format MH stadium horn
systems
Input Connectlons,
Mid Bass/High Frequency:
Screw terminals (#10) on barrier strip;
each driver can be individually accessed;
high-frequency driver has blocking
capacitor for protection
Construction,
Main Horn Bell:
One-piece black polyester and
fiberglass laminate with composite
reinforcement
Hanging Hardware:
4-point, black , 10-gauge polyester-
powder-coated steel
Dimensions,
Height:
68.6 cm (27.0 in.)
Wldth:
68.6 cm (27.0 in.)
Depth:
71 . 1 cm (28.0 in.)
Net Weight:
27.2 kg (60 lb)
Shipping Weight:
33.6 kg (74 lb)
DESCRIPTION
The Electro-Voice MH660C is a two-way horn-
loaded speaker system for permanent installa-
tion. Because the mouth dimensions of both
the mid-bass and high-frequency horns were
correctly chosen and are large enough with
respect to the wavelengths reproduced, the
MH660C provides unifon directivity control
down to 500Hz. This super directivity control
increases speech intelligibility and musical clar-
ity in difficult acoustic environments. Other
horn systems wlth smaller radlatlng areas
simply cannot provlde the hlgh degree of
directional control associated with the
MH660C.