Altec Lansing 9444B User Manual
Page 2
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Table of Contents
1 ELECTRICAL.................................................................................................................................................
1.1 120 V ac, 50/60 Hz Power Connections......................................................................................................
1.2 220/240 V ac, 50/60 Hz Power Connections...............................................................................................
2 INSTALLATION............................................................................................................................................
2.1 Rack Mounting ...........................................................................................................................................
2.2 Ventilation ...................................................................................................................................................
3 SIGNAL CONNECTIONS................................................................................................................................. -
3.1 Input Connections ........................................................................................................................................... -
3.2 Line Outpxrt Connections...........................................................................................................................
3.3 Output Connections........................................................................................................................................ 2
3.4 Output Cable Selection................................................................................................................................... -
3.4.1 Calculating Power Losses with 8 ohm Loads......................................................................................
3.4.2 Calculating Power Losses with 4 ohm Loads...................................................................................... 3
3.0 Damping Factor...........................................................................................................................................
3.5.1 Calculating the Maximum Length of Cable for a Specified Damping Factor..................................... • i
3.6 Speaker Protection Fuse Selection..............................................................................................................
3.7 Compression Driver Protection Capacitors ................................................................................................
5 PROTECTION SYSTEMS ............................................................................................................................
5.1 Load Protection Circuitry............................................................................................................................
5.2 Amplifier Protection Circuitry ....................................................................................................................
5.3 Protect Indicator...........................................................................................................................................
6 OPERATION..................................................................................................................................................
6.1 Dual Mode of Operation.................................................................................................................................... .
6.2 Bridge Mode of Operation .............................................................................................................................. P
7 IN CASE OF PROBLEMS .............................................................................................................................
8 SPECIFICATION................................................................................................................................................ S
9 SERVICE INFORMATION........................................................................................................................... L2
9.1 Trimpot Adjustments.......................................................................................................................................2
9.2 Equipment Needed........................................................................................................................................ ;2
9.3 Adjusting R39, the LF Cancel Trimpot.......................................................................................................
9.4 Adjusting R26, the BIAS Trimpot................................................................................................................... ù
9.5 Adjusting R23 and R24, the Negative and Positive Current Limit Trimpots.............................................. 3
9.6 Checking the Short Circuit Current ............................................................................................................ . ^
9.7 Ordering Replacement Parts .......................................................................................................................
9.8 Factory Service ... .......................................................................................................................................
9.9 Technical Assistance ..................................................................................................................................
10 THE 9444B/SA ..............................................................................................................................................
Operating and Service Instructions for the Altec Lansing 9444B Power Amplifier
ALTEC LANSING^ CORPORATION • a Mark TV Company