Altec Lansing 3124 User's Manual
Contents
1. ALTEC LANSING Hummen DESCRIPTION The Altec Lansing Model 3124 12 inch low frequency loudspeaker is part of Altec s new generation of woofers Each loudspeaker in this line was engineered for a particular purpose The 3124 is designed specifically for the repro duction of low frequencies with minimum distortion in a compact enclosure When used as an integral component of the 8124 Loudspeaker System 3 cubic foot vented enclosure full capability of the 3124 is achieved This system provides a 3 dB down frequency of 40 Hz with an optimum Thiele Small alignment Power capacity for the 3124 is 250 watts when measured by the new AES standard specifica tions The 3124 will handle 500 watts of program material when configured as the 8124 system or mounted in another suitable enclosure As with all Altec professional series woofers the 3124 is built with a structurally reinforced die cast frame The ferrite magnet structure coupled with an exceptionally high power voice coil pro vides low distortion even at very high sound pressure levels 3124 LOW FREQUENCY SPECIFICATIONS Frame Diameter Power Rating Frequency Response Hz Pressure Sensitivity 1 watt Ex I with pink noise band limited 100 1000 Hz Maximum Sound Pressure Full power E Z with pink noise band limited 40 400 Hz Impedance Recommended System Ma2. 2 March In 8124X Enclosure LITHO IN U S A 20 50 100 200 Hz 500 1000 2000 5000 10000 20000 10 20 50 100 200 Hz 500 1000 2000 5000 Figure 2 Impedance LOUDSPEAKER MOUNTING DIMENSIONS A Loudspeaker Diameter 1214 31 12 cm Br Depth When Front Mounted 5 12 7 cm Br Depth When Rear Mounted 534 14 6 cm ARCHITECT S AND ENGINEER S SPECIFICATIONS The low frequency loudspeaker shall meet the fol lowing criteria AES power rating up to 250 watts of band limited pink noise 40 400 Hz Frequency response uniform from 30 2000 Hz when mounted in a suitable enclosure Pressure Sensitivity 93 dB SPL when measured at 1 meter on axis from front edge of Altec Model 8124 Loudspeaker System containing one model 3124 speaker with one watt of band C Baffle Opening Diameter 111 28 26 cm D Bolt Circle Diameter 115 29 52 cm E Bolt Hole Slots 14 0 64 cm x 2 0 87 cm 8 slots spaced 45 apart limited pink noise from 100 1000 Hz Ref 0 0002 dyne cm Minimum impedance 8 ohms Nominal free air LF cone resonance 26 Hz The voice coil shall be 3 in diameter driven by a ferrite magnet having a flux density of 9 000 gauss Dimensions 12 diam eter x 5 deep Weight 18 5 pounds The low frequency loudspeaker shall be the ALTEC LANSING Model 3124 ALTEC 1250 NORTH RED GUM STREET ANAHEIM CALIFORNIA 92806 ALTEC CORPORATION 1283 5M Revisi
3. on 3 AL 2415 42 02 024897
4. ximum Excursion Before Damage Peak to Peak Voice Coil Diameter Thiele Small Parameters Free Air Resonance fs Equivalent Volume Compliance Vas Total Q Qrs Electrical Q Qes Mechanical Q Qws Reference Efficiency no D C Resistance Re Peak Linear Displacement Xmax Peak Linear Volume Displacement Vp Effective Surface Area of Driver Diagram Sp Additional Parameters Effective Piston Diameter Voice Coil Inductance BL Factor Magnet Type Magnet Weight Flux Density Mounting Information Baffle Opening Diameter Mounting Bolt Circle Diameter Loudspeaker Depth front mounting Loudspeaker Depth rear mounting Weight AES power rating measured E Z where E 45V Z 82 band limited 40 400 Hz LOUDSPEAKER 12 500 watts program material 250 watts continuous pink noise band limited 30 2000 91 dB at 4 feet 93 dB at 1 meter 113 dB at 4 feet 115 dB at 1 meter 8 ohms nominal 8124 3 ft System F 40 Hz 1 44 in 3 in 26 Hz 6 6 ft 0 27 0 32 2 92 1 1 6 4 ohms 0 25 in 19 6 in 78 5 in 10 0 in 4 3 mH 15 3 ferrite 48 oz 9 000 gauss 11 28 26 cm 115s 29 52 cm 5 12 7 cm 53 4 14 6 cm 18 5 Ibs 8 4 kg AES Recommended Practice Specification of Loudspeaker Components Used in Professional Audio and Sound Rein forcement See J Audio Eng Soc Vol 30 No 3 198
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