Altec mr ii 594a hf horn

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ALTEC ® MR |I 594A MANTARAY®CONSTANT

LANSING

DIRECTIVITY HORN

DESCRIPTION

The Altec Lansing MR || 594A is a 90° x 40° mid/
high-frequency horn with efficient low-frequency
loading down to 500 Hz, having excellent
directivity control over the full frequency range to
16 kHz.

The result of a continuing research project by
Altec Lansing, the MR ll 594A is a radical depar-
ture from previous horn designs. The geometry of
the MR ll 594A minimizes the problem of high-
frequency beaming and maintains uniform dis»
persion at all frequencies within the rated
frequency bandpass. This greatly benefits the lis-
teners sitting off-axis of a MANTARAY horn, as
they will hear the same sound quality as listeners
sitting on-axis.

Performance is shown graphically in the MR ||
594As test results. Polar patterns look nearly iden~
tical at all frequencies from 2 kHz to 16 kHz. Fre
quency response curves show similar uniformity
both on-axis and off-axis.

The MANTARAY horn is constructed of heavy-
duty, weather resistant General Electric Noryl'.
This construction material results in a horn design
that is surprisingly light weight, yet extremely rug-
ged and non-resonant, A steel driver/horn mount-
ing bracket is included for ease of mounting.

SPECIFICATIONS

Nominal Dispersion

Angle: 90° x 40°

Dispersion Angle

vs. Frequency: See Figure 1

Mean Dispersion

Angle- Horizontal Vertical
(2 kHz to
16 kHz): 93° (+10°, -- 13°) 40" (+8, -6°)
Standard
Deviation (a): 7' 5"

Polar Patterns: See Figure 6

Solid Angle Coverage

(1 to 2 kHz): See Figure 5

Frequency Response: See Figures 2 8: 3
Directivity Index

(DI): See Figure4
Directivity Factor

(Q or Ra): See Figure 4
Mean Directivity (Q)

(2 kHz to 16 kHz): 12.9 (+4.6, -3.4)

(See Figure 4)
Useable Low
Frequency Limit:
Pressure Sensitivity

500 Hz

dB (SPL): Measured on axis 10 feet
from the horn mouth with
one watt (E x I) of pink noise
band-limited from 500 Hz to
16 kHz and calculated to one
meter equivalent by inverse
square law.
Driver Power level 1 Meter 4 Feet
288 1 watt 110 108
15 watts 122 120
290 1 watt 108 106
100 watts 128 126
291 1 watt 109 107
40 watts 125 123

12.76 (32.41 cm) high
22.875 (58.10 cm) wide
12.5 (31.75 cm) deep

Dimensions:

Weight: 4.6 lbs. (2.1 kg)
Accessories: 25544 adapter
REFERENCE LITERATURE

"The Mantaray Horns, C. A. Henricksen and M.
Ureda, ]. Audio Eng. Soc, vol. 26, p 629-634 (1978
Sept.)

Apparent Apex Theory: Far-Field Polar Character-
istics at Close Proximity," M. Ureda, I. Audio Eng.
Soc. (Abstracts), vol. 26, p 988 (1978 Dec.)
Coverage of Multiple Mantaray Horns," M. Ureda
and T. Uzzle, Tech. Letter #262, Altec Lansing.

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