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ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The motors shall be large format high frequency compression
drivers. These drivers shall have an operating bandwidth of 500
Hz – 16 kHz. The minimum power handling capability of the
drivers shall be 40 W AES (160 W peak). One driver shall have a
minimum impedance of 8 ohms (between 4 kHz and 5 kHz),
and the other driver shall have a minimum impedance of 16 ohms
(between 4 kHz and 5 kHz). The voice-coil for the drivers shall
be an edge-wound, aluminum ribbon, which is 2.83 inches
(72 mm) in diameter. These drivers shall have a diaphragm that
features an all-metal, Pascalite dome and tangential compliance.
The magnetic gap of these drivers shall have a flux density of 2.05
T, resulting from a 6.7 lbs. (3.0 kg) ferrite magnet. A Tangerine
phasing-plug with thirteen radial acoustic slots shall provide the
proper phase relationship between sound emanating from the
center and edges of the diaphragm's dome on these drivers. The
entire diaphragm and voice-coil assembly for these drivers shall be
field replaceable without requiring special tools, because
adjustable dowel pins shall allow each voice coil to be precisely
centered in the magnetic gap. The driver shall be 7.7 inches
(196 mm) in diameter by 3.88 inches (99 mm) deep, excluding the
As we are continually striving to improve Altec Lansing products, specifications are subject to change without notice.
Please visit www.altecpro.com for the latest information on Altec Lansing Professional products.
SPECIFICATION NOTES
1 The frequency response of the loudspeaker is measured at a distance of no less than 3 meters to obtain full range data. The level is then corrected to be
equivalent to a 2.83 V 1 m measurement.
2 The limits of the frequency response are referenced to -10 dB of the loudspeaker's rated sensitivity.
3 The sensitivity of the loudspeaker is the log based average SPL taken over the intended bandwidth of operation for the loudspeaker with a 2.83 V swept sine
stimulus. The data is measured and level corrected in a manner consistent with note 1.
4 The power handling capacity of the loudspeaker is tested using a full range form of AES Standard 2-1984. The test stimulus is band limited (500 Hz – 16 kHz) pink
noise with a 6 dB crest factor. The applied RMS voltage is determined using the minimum impedance of the loudspeaker. The amplifier used to drive the
loudspeaker has a minimum operating headroom of 6 dB referenced to the RMS voltage.
5 The peak output level of the loudspeaker is calculated based on the sensitivity and the peak power handling capabilities of the loudspeaker.
6 The coverage angles for the loudspeaker are taken as the -6 dB points of the directivity response and averaged from 500 Hz – 16 kHz.
7 The minimum impedance of the loudspeaker is taken over its intended band of operation.
8 The distortion measurements of the loudspeaker are performed at a distance of 1 m with RMS input voltages corresponding to 10% of rated power handling
calculated using minimum loudspeaker impedance. The distortion percentages are log based averages from 500 Hz – 10 kHz.
VISIT WWW.ALTECPRO.COM FOR
• Authorized EASE data on all Altec Lansing Professional loudspeakers
• Specification sheets in .pdf format. Download page 1 of the specification sheet for you submittals.
• One paragraph A&E Specifications in .doc format
AW1072 REV02
FREQUENCY RESPONSE AND IMPEDANCE MAGNITUDE OF 399-8B ON MR II 594B
© 2003 Altec Lansing Professional
1000 W. Wilshire Blvd., Suite 362
Oklahoma City, Oklahoma 73116
Phone: 1-405-848-3108 • Fax: 1-405-848-3217
Web: www.altecpro.com • Email: proinfo@alteclansing.com
one inch (25.4 mm) depth of the mounting studs. The driver shall
weigh 20.6 pounds (9.3 kg).The high frequency compression
drivers shall be the Altec Lansing model 399-8B and the Altec
Lansing model 399-16B.
The projectors shall be constant-directivity mid and high
frequency horns. These horns shall have an operating bandwidth
of 500 Hz – 20 kHz. One horn shall have a mean horizontal
dispersion angle of 60° and a mean vertical dispersion angle of
40°. The other horn shall have a mean horizontal dispersion angle
of 90° and a mean vertical dispersion angle of 40°. When the
399-B series drivers are coupled to the 90° x 40° horn, this
TM
combination shall have a sensitivity of at least 110 dB, when
measured on-axis, at a distance of one meter, with a one Watt
input. When the 399-B series drivers are coupled to the 60° x 40°
horn, this combination shall have a sensitivity of at least 112 dB,
when measured on-axis, at a distance of one meter, with a one
Watt input. The constant-directivity mid and high frequency horns
shall be the Altec Lansing model MR II 564B and the Altec Lansing
model MR II 594B.
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R O F E S S I O N A l
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