662A Mic/Line Mixer Power Altec Lansing Pr ofessional Professional 1000 W. Wilshire Blvd.
Operating Manual -1662A Mic/Line Mixer Table Of Contents 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 UNP ACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 PA 3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 FRONT P ANEL CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Manual -1662A Mic/Line Mixer 1. INTRODUCTION Congratulations on your purchase of an Altec Lansing 1662A mic/line mixer, a professional, studio quality solution to everday mixing needs. The 1662A features six mic/line inputs with mic input pad, TRS insert points, and +48V phantom power. Each channel has up to 60dB input gain, separate treble and bass controls, level, and an output channel assign switch for sending any channel to either or both outputs.
Operating Manual -1662A Mic/Line Mixer 4. FRONT P ANEL CONTROLS PANEL 4.1 Input Gain S w i t c h This three position switch sets the operating level of the input preamp to +20db, +40dB, or +60dB. Best signal to noise ratio is obtained with higher gain settings. It is therefore desirable to set the gain switch as high as possible while still leaving 20dB of headroom for signal peaks.
Operating Manual -1662A Mic/Line Mixer Power clipping, detecting excessive signal level on any critical audio path within the master section. If all outputs are turned down and there is still clipping, then one or more inputs needs to be turned down. 4.8 Phantom Power LED The phantom power switch is on the back panel. When the switch is pressed in, the LED is lit and +48VDC is applied to all six mic inputs for use with condenser microphones.
Operating Manual -1662A Mic/Line Mixer 6. REAR P ANEL FEA TURES PANEL FEATURES 6.1 Micr ophone Input Microphone The 1662A microphone input is an active balanced type with a nominal impedance of 1200 ohms. Its noise performance is best with a 200 ohm microphone. The mic input connector is a 3-pin Euroblock with the shield on (G), the (+) in-phase connection on (+), and the (-) outof-phase connection on (-).
Operating Manual -1662A Mic/Line Mixer the use of mic inputs on channels five or six, but only one level controls both the mic and RCA inputs. The RCA sum inputs have a nominal operating level of -10dBu to match most consumer audio sources. 6.5 Outputs The Euroblock "A" and "B" outputs are controlled by the output level master controls. They are active servo-balanced with a nominal operating level of +4dBu into any load, and are capable of driving long lines. Outputs can be used balanced or unbalanced.
Operating Manual -1662A Mic/Line Mixer 8. TYPICAL APPLICA TION: APPLICATION: In the setup shown here, the 1662A is used to mix typical sound sources that might be found in a church, small club, gym, school theater or similar environment. Channels 1-4 are used for vocal microphones, while the remaining two channels are used for stereo program tracks. "B" output is used for main loudspeakers, and "A" output is used for speakers in another location, such as ceiling speakers in a hallway.
Operating Manual -1662A Mic/Line Mixer 10. SPECIFICA TIONS SPECIFICATIONS PEAK INDICA TORS INDICATORS DISTOR TION DISTORTION Peak Clip indicator on each input channel and left and right outputs, illuminates 3dB below clipping THD at +4 dBu, 20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . <0.01% IMD (SMPTE) at +4dBu . . . . . . . . . . . . . . . . . . . . . . . . . <0.01% HUM & NOISE (20Hz-20KHz at max pr eamp gain) preamp PHANTOM POWER +48 VDC applied to all Mic Inputs, switchable on rear panel.
Operating Manual -1662A Mic/Line Mixer 12. 1662A Block Diagram Input Channels 1-4 Input Clip Indicator Mic Gain +20 +40 +60 Output Meters Output A Mic Input EQ Channel Level Bass Treble Level Mic Preamp -20dB Pad +12dB max 0dB Mid Output Assign 5 A A+B B Output Level +12dB max +1.6dB Mid + G Level Insert Point Output Meters Output B Input Channels 5-6 Input Clip Indicator Mic Gain +20 +40 +60 5 Output Level +12dB max +1.
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Operating Manual -1662A Mic/Line Mixer Altec Lansing Professional 1000 W. Wilshire Blvd.
