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Each loudspeaker in this line was engineered for a particular purpose. The 3124 is designed specifically for the reproduction 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 specifications. 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 provides low distortion even at very high sound pressure levels. Frequency Response (Hz) : Pressure Sensitivity (1 watt (E x 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: Maximum Excursion Before Damage (Peak to Peak): Voice Coil Diameter: Thiele-Small Parameters— Free-Air Resonance (fs) : Equivalent Volume Compliance (Vas): Total Q (Qts) : Electrical Q (QEs): Mechanical Q (Qms): Reference Efficiency (ij0) D. C. Resistance (Re): Peak Linear Displacement (XMax) : Peak Linear Volume Displacement (VD): Effective Surface Area of Driver Diagram (So): 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: 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 ft3) System F3: 40 Hz 1.44 in. 3 in. 26 Hz 6.6 ft3 0.27 0.32 2.92 1.1% 6.4 ohms 0.25 in. 19.6 in.3 78.5 in.2 10.0 in. 4.3 mH 15.3 ferrite 48 oz. 9.000 gauss 11 Va" (28.26 cm) 115/s" (29.52 cm) 5" (12.7 cm) 5-3/4" (14.6 cm) 18.5 lbs (8.4 kg) *AES power rating measured E7Z where E — 45V, Z — 8^, band-limited 40-400 Hz. (AES Recommended Practice Specification of Loudspeaker Components Used in Professional Audio and Sound Reinforcement. See J. Audio Eng. Soc., Vol. 30, No. 3, 1982 March.) “In 8124X Enclosure. LOUDSPEAKER MOUNTING DIMENSIONS (A) Loudspeaker Diameter: 12V4" (31.12 cm) (Bf) Depth When Front Mounted: 5" (12.7 cm) (Br) Depth When Rear Mounted: 53/4" ('14.6 cm) ARCHITECT'S AND ENGINEER'S SPECIFICATIONS The low frequency loudspeaker shall meet the following 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: 11 Vs" (28.26 cm) (D) Bolt Circle Diameter: 115A" (29.52 cm) (E) Bolt Hole Slots: 1A" (0.64 cm) x %" (0.87 cm) 8 slots spaced 45° apart. limited pink noise from 100-1000 Hz (Ref.: 0.0002 dyne/cm2). 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-eterx 5" deep. Weight, 18.5 pounds. The low frequency loudspeaker shall be the ALTEC LANSING Model 3124. ALTEC L_AISISirslG 1250 NORTH RED GUM STREET, ANAHEIM, CALIFORNIA 92806 ALTEC CORPORATION LITHO IN U.S.A. 1283-5M Revision 3 AL-2415 42-02-024897...