User manual ALTEC LANSING 299-16A HF DRIVER

[. . . ] In the event that damage has occurred, immediately notify your dealer so that a written claim to cover the damages can be initiated. The right to any claim against a public carrier can be forfeited if the carrier is not notified promptly and if the shipping carton and packing materials are not available for inspection by the carrier. Save all packing materials until the claim has been settled. 3. AC POWER REQUIREMENTS The 1662A mixer will perform normally from 93 to 125 volts AC, 50-60Hz (some export models are wired for 240 Volts and are labeled accordingly). [. . . ] If the clip LED is still flashing, turn down the input gain. 4. 2 Clip Indicator Input Clip LEDs are peak sensitive and monitor all critical points within the input channel. The clip LED turns on whenever any portion of the audio path within the input channel reaches a level 3 dB below actual clipping. 4. 3 Tr eble and Bass Contro l s Tr Contro These controls are used for broad EQ changes to each input channel. Channel EQ consists of a high shelf control (treble) at 8KHz, and a 90Hz low shelf control (bass). EQ boost or cut is ±12dB at these frequencies. 4. 4 Input Assign Switch This switch selects the output routing for each input channel. Each input can be routed to Output A, B, or both. Contro 4. 5 Input Level Contro l This knob adjusts the level of each channel. If a channel's level control is always turned up to 9 or more, try increasing the gain first. Conversely, if the level control is consistently turned down to 1 or less, decrease the gain setting first. Remember that the gain setting should be set as high as possible while still allowing 20dB of headroom. REAR PANEL FEATURES Microphone 6. 1 Microphone Input 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 (-). If the input is unbalanced, or single ended (meaning there is only one signal wire with a shield) connect the signal wire to (+), and connect the shield to both (-) and (G). 6. 3 Channel TRS Insert A 1/4" stereo phone jack insert point allows a device such as a remote level controller, graphic equalizer, noise gate, compressor/limiter, or direct out recording device to be used with one or more input channels. The 1662A TRS (tip-ring-sleeve) insert jacks use the tip for output and ring for the returning input. These signals will be unbalanced, so cable length should be at a minimum to maintain low noise. +- G To use the TRS insert as a Direct Line Output (pre EQ) for recording individual channels, make a special cable with tip and ring connected at the 1662A end and a tip-sleeve mono plug at the other end. Connecting tip and ring at the mixer insert jack is necessary for uninterrupted signal within the mixer when using direct line outputs. Tip Ring Sleeve (Ground) Stereo Phone Plug Euroblock Connector System 6. 2 Input Pad +- G 6. 4 Sum Inputs The RCA sum inputs on channels five and six are typically used for auxillary audio sources such as a disc or tape player, summing a stereo source into a mono signal for each channel's input. Using the sum inputs does not prevent The input pad is a 20dB attenuation switch for extremely loud microphone or line level inputs. It should normally be left in the "out" position for best signal to noise ratio, but can be used when the input is being clipped with the gain and level control at minimum. 6 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. [. . . ] 7. 4 Excessive hum This is usually caused by "ground loops" in the system wiring. A complex sound system with many sources separated by significant distance and using several power outlets has many opportunities for this problem to occur. If possible, every component in the system should be plugged into the same AC circuit with a common ground. Use balanced input and output connections between widely separated components. 7 Operating Manual -1662A Mic/Line Mixer APPLICATION: 8. [. . . ]