Altec Lansing A6 Series User's Manual
Contents
1. Unpack the 8256X cabinet This cabi net is sealed at the factory do not attempt to take it apart or remove the back panel Turn the cabinet so the short side with out fiberglass lining is up drill a hole in the top avoiding the diagnonal brace This hole should be just large enough to pass four wires through the second loudspeaker as shown in Figure 2 Feed the attached red and black wires through the hole drilled in the top of the cabinet Step 2 or through one of the bass reflex ports install the second loudspeaker in the remaining baffle opening and secure it with the eight screws packed with the loudspeaker A6 SERIES LOUDSPEAKER SYSTEMS 12 13 14 15 16 connectors from these wires and replace them with those packed with the 288 8K Place the N1285 8A on top of the cabi net facing left or right if the speaker wires are routed through a port in the baffle put the N1285 8A on the same side Set the frequency switch of the N1285 8A to 500 Hz or 800 Hz Wire the N1285 8A according to Figure 2 If the amplifier to be used cannot safely drive a 5 ohm load wire the sys tem as shown in Figure 3 using a 15067 autoformer If you wish to attach the N1285 8A to the cabinet let the front panel of the network hang over the side of the cabinet drill or punch twao pilot holes and install two wood screws to secure the network Decide how much power loss is accept able in the line b2. etween the amplifier and the loudspeaker select a wire gauge according to Altec Lansing Technical Letter 265A Attach the wires to the input terminals of the 7 Lift the cabinet upright and place it in N1285 8A network NOTE the position it will occupy Do not drill this hole if the loud 17 Adjust the tilt of the HF horn for great speaker is to be installed behind 8 Unpack the two brackets and driver est uniformity of direct sound in the the screen in a motion picture cradle from the hardware kit Assemble audience area loosen the nuts and theatre them with two bolts two lockwashers raise or lower the driver cradle as and two 7 16 nuts See Figure 1 Set necessary retighten nuts The interconnecting wires are packed the assembly on top of the cabinet approximately centered with the driver 18 Operate the loudspeaker and adjust Locate the four longest wires one red cradle toward the rear of the cabinet the H F LEVEL control on the N1285 wire one green wire two black wires 8A until the best spectral balance is 9 Upack the 288 8K HF driver and the HF achieved Unpack the two 3156 LF loudspeakers horn MRII564 MRII594 or MRI15124 Attach a green and black wire to the Place the gasket packed with the 19 If there is sufficient front to back terminals of one loudspeaker See 288 8K around its sound exit hole clearance around the loudspeaker Figure 2 install the 288 8K on the horn securing adjust phasing of the drivers accordi
3. ion 42 02 035593 Specifications and components subject to change without notice Overall performance will be maintained or improved ALTEC 42 02 035639 42 07 035639 REVISION 2 LITHO IN U S A 1091 1 7M ALTEC LANSING CORPORATION LANSING a MARK IV company 10500 W Reno Ave Oklahoma City OK 73126 22 If it becomes necessary to recone the RED WHITE 3156 loudspeakers use a R3156 recone kit follow service instructions in Altec K Lansing publication 42 02 035594 Va 23 If it becomes necessary to repair the 8256X cabinet construction plans are given in Altec Lansing Applications Note 12 Individua copies of this and all Altec Lansing publications are available without charge from Altec Lansing Box 26105 Okla homa City OK 73126 0105 500 800 1200 N1285 8A Figure 1 Horn Mounting Assembly Figure 2 Wiring Diagrams for Four Ohm Operation RED 288 8K 500 800 1200 INPUT h eU OUTPUT L ud N1285 8A o Figure 3 Wiring Diagram with 15067 Autoformer
4. ng it with the three lockwashers and 9 16 to Altec Lansing Applications Note 9 Lay the 8256X cabinet on its back nuts provided This will require the front lip of the HF panel Mount one 3156 loudspeaker in horn to overhang the front edge of the one baffle opening of the cabinet 10 Engage the lip flange of the horn in the cabinet about 7 attach the loudspeaker with eight screws packed with the loudspeaker Note that the flange of the loudspeaker is outside the cabinet with the frame and magnet structure protruding into the cabinet Route the green and black wires of the loudspeaker through the opposite baf fle opening attach the wires to the second 3156 loudspeaker Also attach red and black wires to the terminals of 11 two ears of the mounting brackets and swing the driver down into the cradle CAUTION The magnet will pull the cradle toward the driver as it is lowered into position Attach the short black and white wires packed with the N1285 8A network to the terminals on the 288 8K It will be necessary to remove one pair of crimp 20 21 After locating the horn position mark location of the four holes in the mount ing brackets drill or punch pilot holes in the cabinet for the four wood screws provided in the hardware kit If it becomes necessary to replace the diaphragm voice coil assembly in the 288 8K driver use a 23763 diaphragm follow service instructions in Altec Lansing publicat
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