Altec Lansing LF215-4A User Manual

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PR OFE S S IONA L

LF215-4A

FEATURES - THE ALTEC LANSING DIFFERENCE

• Dual 15” / 380mm Low Frequency Speaker

•High Performance 500 W AES / 2,000 W Peak Power Handling

Excellent Broadband Efficiency – 103 dB SPL, 1 W 1 m

Matching Footprint To Altec’s DE6412 & DE9412

Strong 13-PlyBirch Paintable Cabinet

Steel Reinforced Suspension Points

Forged Eyebolt Suspension Kit Included

Available in Charcoal Gray or White Finishes

GENERAL PRODUCT DESCRIPTION

The LF215-4Ais a dual 15” / 380mm subwoofer with the same footprint as the Altec Lansing DE6412 and DE9412 Duplex® full-rangespeaker systems. In addition to its use with Altec’s DE &DS-seriesfull-rangespeaker systems, theLF215-4Acan be easily incorporated intocomponent-basedsound systems. TheLF215-4Ahas been designed to provide extended low frequency performance in Auditoriums, Performing Arts Centers, Houses

of Worship, or any facility requiring low frequency reinforcement for full-rangemusic reproduction.

Two of the Altec model 4156-8A15” / 380mm woofers

are used in the LF215-4A.The drivers may be connected in parallel (for a single four ohm load) or driven individually (for two, eight ohm loads) via a switch and separate driver inputs. This robust component has been designed to deliver tight, punchy low frequency reproduction in vented speaker cabinets. The4156-8Ahas a corrosion resistantdie-castframe andmoisture-resistantcone for maximum durability in all environments.

The 13-plybirch plywood enclosure is paintable, and features steel reinforced suspension points. Altec Lansing includes a forged eyebolt suspension kit with each subwoofer. Input connections are via barrier strip or Neutrik® Speakon® connectors. TheLF215-4Ais offered in either charcoal grey or white, with contrasting cloth covered metal grille. Altec Lansing includes neutral grille cloth with each subwoofer, allowing you to dye the cloth to integrate the subwoofer into the surroundings.

The LF215-4Ais designed to work in conjunction with Altec’s DE6412 and DE9412 Duplex® 12”/300mmfull-rangespeaker systems. Presets are available for the Altec Lansing 4048A

4-inx8-outDSP Processor, allowing the system designer to easily incorporate theLF215-4Aintomulti-channelapplications.

FREQUENCY RESPONSE 1, 2

42 Hz - 650 Hz (±3 dB)

USABLE LOW FREQUENCY LIMIT (-10dB)1, 2

33 Hz

SENSITIVITY 3

103 dB SPL, (2.00 V input)

POWER HANDLING 4

500 W continuous; 2,000 W peak

MAXIMUM OUTPUT (1 m) 5

130 dB SPL continuous; 136 dB SPL peak

TRANSDUCER COMPONENTS

2x 15 in. Woofers (4156-8A)

IMPEDANCE 7

Nominal:

4.0

Minimum:

3.5

Ω at 41 Hz

HARMONIC DISTORTION 8

1% rated power

 

2nd Harmonic

0.30%

3rd Harmonic

0.40%

THD

0.63%

10% rated power

 

2nd Harmonic

1.38%

3rd Harmonic

0.49%

THD

1.54%

 

 

INPUT CONNECTIONS

2x 4 position barrier strip and 2x NL4

CONTROLS

Drivers in Parallel or Split Mode switch

ENCLOSURE MATERIALS & FINISH

18 mm, 13 ply Birch Plywood Finished with Charcoal Grey or White Catalyzed Polyurethane

SUSPENSION SYSTEM 9

Working Load Limit (maximum weight applied to uppermost mounting point): tbd lbs. (tbd kg)

(12) 3/8 in.-16Threaded Mounting Suspension Points (3 each top & bottom and 2 each sides & back)

DIMENSIONS

37.50 in. (H) x 24.13 in. (W) x 26.13 in. (D) x 10.13 in. (W rear)

953 mm (H) x 613 mm (W) x 664 mm (D) x 257 mm (W rear)

WEIGHT

Net

115 lbs. (52.3 kg)

Shipping

138 lbs. (62.7 kg)

1000 W. Wilshire Blvd., Suite 362 • Oklahoma City, Oklahoma 73116 • Phone: 1-405-848-3108• Fax:1-405-848-3217• www.altecpro.com

ARCHITECTS & ENGINEERS SPECIFICATION

The loudspeaker system shall be a low frequency, multipurpose trapezoid enclosure consisting of two 15-inch /380mm cast frame loudspeaker components with moistureresistant cones. The loudspeaker system shall have an operating bandwidth of 42 Hz - 650 Hz with a sensitivity of 103 dB when measured at a distance of one meter. The power handling capability shall be 500 W AES (2,000 W peak). Nominal impedance shall be 4.0 ohms with a minimum impedance of 3.5 ohms at 41 Hz. The unit shall be a trapezoid enclosure constructed of 18 mm

birch plywood with a cloth covered metal grille. The cabinet shall include integral steel-reinforcedsuspension points. Forged shoulder machinery eye bolts shall be included to facilitate the suspension of the speaker system. The dimensions shall be 37.50 inches (953 mm) high by 24.13 inches (613 mm) wide by 26.13 inches (664 mm) deep. The loudspeaker system shall weigh 115 pounds (52.3 kg). The loudspeaker system shall be the Altec Lansing Professional modelLF215-4A.

LF215-4A

Altec Lansing Professional

Oklahoma City, OK 73116

A division of Altec Lansing Technologies, Inc., Milford, PA 18337-0277• Made in China

PARALLEL

MODE

SPLIT

+

-

+

-

 

 

 

 

 

INPUT

 

 

 

 

PARALLEL MODE

 

 

 

 

4 OHMS

 

 

 

PIN 1 +

SPLIT MODE

 

 

 

2x 8 OHMS

 

 

 

PIN 1 -

PARALLEL MODE

 

 

BOTTOM

PARALLEL MODE

 

 

 

DRIVER

 

TOP DRIVER

 

 

SPLIT MODE

TOP DRIVER

SPLIT MODE

 

 

 

SPLIT MODE

 

 

 

 

PIN 2 PIN 2

+

-

BOTTOM

DRIVER

SPLIT MODE

+ - +-

As we are continually striving to improve Altec Lansing products, specifications are subject to change without notice. Please visit www.altecpro.com for the lastest information on Altec Lansing Professional products.

MOUNTING DIMENSIONS

26.10 [663.05]

16.19 [411.26]

1.71 [43.40]

6.33 [160.76]

18.70 [475.02]

6.65 [169.01]

37.40 [950.00]

9.47 [240.47]

 

10.10 [256.65]

 

5.1 [128.33]

 

1.7 [43.40]

26.11 [663.28]

16.64 [422.71]

DENOTES CENTER OF MASS

7.56 [192.14]

DIMENSIONS ARE IN INCHES.

DIMENSIONS SHOWN IN ( ) PARENTHESES ARE IN MILLIMETERS.

15

11.9 [301.51]

9.47 [240.47]

24.1 [612.10]

SPECIFICATION NOTES

1 The frequency response of the loudspeaker system 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 2.0 V 1 m measurement. A near field measurement of the loudspeaker system 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 -3dB of the systems rated sensitivity.

3 The sensitivity of the loudspeaker system is the log based average SPL taken over the intended bandwidth of operation for the system with a 2.0 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 system is tested using a full range form of 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 system. The amplifier used to drive the system has a minimum operating headroom of 6 dB referenced to the RMS voltage.

5 The maximum output level of the loudspeaker system is calculated based on the sensitivity and the power handling capabilities of the system.

7 The minimum impedance of the loudspeaker system is taken over its intended band of operation.

8 The distortion measurements of the loudspeaker system are performed at a distance of 1 m with RMS input voltages corresponding to 1% and 10% of rated system power handling calculated using minimum system impedance. The distortion percentages are log based averages from 30 Hz – 300 Hz.

9 Before attempting to suspend the loudspeaker system, consult a certified structural engineer. This loudspeaker system can fall from improper suspension, resulting in serious injury and property damage. Maximum enclosure rigging angle is 45°. Use only the correct mating hardware, forged shoulder machinery eye bolt, Mil Spec MIL 51937-3.All associated rigging is the responsibility of others.

VISIT WWW.ALTECPRO.COM FOR

Authorized EASE® data on Altec Lansing Professional speakers.

Specification sheets in .pdf format. Download page 1 of the specification sheet for your submittals.

One paragraph A & E Specifications in .doc format.

 

PR OFE S S IONA L

 

© 2003 Altec Lansing Professional

 

1000 W. Wilshire Blvd., Suite 362

 

Oklahoma City, Oklahoma 73116

 

Phone: 1-405-848-3108• Fax:1-405-848-3217

AW1139 REV01

Web: www.altecpro.com • Email: proinfo@alteclansing.com