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Altec Lansing 4200A manual

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Table of contents for the manual

  • Page 1

    6125A 4200A Mul ti-channel power a mplifiers Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr ofessional ofessional ofessional ofessional ofessional 1000 W . Wilshire Blvd. Suite 362 Oklahoma City , OK 73116 USA A division of Altec Lansing T echnologies Inc, Milford P A 18337-0277 Made In USA[...]

  • Page 2

    2 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier T able O f Co ntents 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 UNP ACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 AC POWER REQUIREME[...]

  • Page 3

    3 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier CAUTI ON RI S K O F ELEC T RI C SH O CK DO NO T OPE N The lightning flash with arrowhead symbol, within an equalateral triangle, is intended to alert the user to the presence of uninsulated "danger - ous voltage" within the product's enclosure that may be of sufficient [...]

  • Page 4

    4 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 1. INTRODUCTION The 6125A and 4200A po wer amplif iers combine the ef ficienc y of a MOSFET high-speed switching output stage with the sophistication of modern microprocessor and DSP technology to produce a multi-channel amplifier with unprecedented versatility and po wer in a single [...]

  • Page 5

    5 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 4. CABLE REQUIREMENTS 4.1 Input Cables Be sure to use shielded cable whether balanced or unbalanced. Shielding which is properly grounded will protect the signal from outside electrical interference such as RF , fluor escent lighting, and computer/display emis- sions. As a general rul[...]

  • Page 6

    6 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 6. FRONT P ANEL FEA TURES 6.1 Po wer Switc h When the unit is switched on there is a f iv e sec- ond delay , during which time the PR O TECT circuit will activ ate, disconnecting the speakers from the amplifier output. When turning off the amplif ier, the load is remo ved instantly , [...]

  • Page 7

    7 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 7. REAR P ANEL FEA TURES 7.1 Input Connectors The 6125A and 4200A inputs use balanced two piece "Euroblock" style connectors. It is recommended that balanced input connections be used whenev er possible to take full adv antage of the amplifier's common mode rejection pr[...]

  • Page 8

    8 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 7.5 Input Level Contr ols Input Le vel Controls attenuate input signal from 0dB d o wn to - ∞ . F or best per f o r manc e , A ltec r ecommends that the lev el contr ols be operated at full lev el (0 dB at- tenuation). In STEREO mode, each le vel control corresponds directly to the [...]

  • Page 9

    9 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 7.9 A C Inlet The 6125A and 4200A amplifiers can be conf ig- ured by the customer for operation at either 115V A C or 230V A C mains. Switching from one to the other simply requires the following ste ps: 1.) Unplug the amplifier from the w all and re- mov e the power cord from the rea[...]

  • Page 10

    10 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier In all cases, the amplifier will restart the signal processing module after a short delay and will reconnect the speakers after se veral seconds if no further f ault con- ditions exist. This allows the serv o circuitry to bring any residual DC offsets to zero before speak ers are con[...]

  • Page 11

    11 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 9.1 Six Channel Setup 9.2 Dual Mono Setup Outputs  ! " # $  ! " # $ I np u t Se cti on : Up to Six D iff erent I np uts St ereo /M ono Swit ches - Out Dual B r idge Swit ches - Out Lev els Co ntr ols - Used Per I np ut Cha nne l Sp ea ke r Ou t puts - Up To Six Differ[...]

  • Page 12

    12 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 9.3 Bridged Mono Setup 9.4 T ypical P A Setup Outputs  ! # I np u t Se cti on : Up to Three Diffe rent Inpu ts St ereo /M ono Sw itc hes - In Dual/Brid ge Switches - In Levels C ontrols - Only C hannels 1, 3, or 5 Used Minimum Speaker Load Per Bridged Channel Pair = 8 9 Amp lifie [...]

  • Page 13

    13 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 10. DESIGN THEORY The 6125A and 4200A amplifiers are based on stereo driv er modules tha t use digital processing to gener- ate a spread-spectrum switching pattern between about 200KHz and 1.5MHz, depending on input signal ampli- tude and frequency . This ov ercomes the self-limiting[...]

  • Page 14

    14 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 11.2 Distorted Sound 1.) Clip LED is flashing r e gularl y Amplif ier is being ov erdriven. T urn down the in- put le vel control, or reduce the output lev el from the sig- nal source. 2.) Clip LED is not flashing at all Amplifier input signal may be e xceeding input headroom, which [...]

  • Page 15

    15 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 13. SPECIFICA TIONS *P ow er Output (Maximum A verage Po wer , 0.1% THD, 1KHz) Rated Per Channel, T wo Channels Driv en 6125A 4200A 4 ohm: 250 W atts RMS 400 W atts RMS 8 ohm: 150 W atts RMS 275 W atts RMS Mono Bridged (1 Channel) 8 ohm: 500 W atts RMS 800W a tts RMS Rated Per Channe[...]

  • Page 16

    Printed in USA 6125A-0 0503 Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Pr ofessional ofessional ofessional ofessional ofessional 1000 W . Wilshire Blvd. Suite 362 Oklahoma City , OK 73116 USA A division of Altec Lansing T echnologies Inc, Milford P A 18337-0277 Made In USA Operating Manual 6125A and 4200A Mult[...]