ARCHITECT’S AND ENGINEER’S SPECIFICATIONS
The loudspeaker shall be a multi-purpose 15 inch /
381
mm low
frequency cone driver. The loudspeaker shall have an operating
bandwidth of 27 Hz - 3.4 kHz with a sensitivity of 99 dB when
measured at a distance of one meter. The power handling
capability shall be 250 W AES (1,000 W peak). Nominal
impedance shall be 8 ohms with a minimum impedance of 6.5
ohms at 160 Hz. The nominal free-air resonance shall be 29 Hz.
The dimensions shall be 15.875 inches (403 mm) in diameter by
6.625 inches (168 mm) deep. The loudspeaker shall weigh 21
pounds (9.5 kg). The loudspeaker shall be the Altec Lansing
Professional model 4156-8A.
FREQUENCY RESPONSE
IMPEDANCE
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.
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. A near field measurement of the loudspeaker is performed for frequencies below
500 Hz. This data is then combined with the full range measurement to give an accurate composite frequency response curve.
2 The limits of the frequency response are referenced to -10 dB of the loudspeakers 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 AES Standard 2-1984. The test stimulus is band limited (30 Hz – 300 Hz) 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 maximum output level of the loudspeaker is calculated based on the sensitivity and the power handling capabilities of the system.
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 1% and 10%
of rated power handling calculated using minimum loudspeaker impedance. The distortion percentages are log based averages from 50 Hz –
1 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
SPECIFICATION NOTES
AW1078 REV0
2
© 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: [email protected]
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