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7

Operating Manual -1662A Mic/Line Mixer

channel gain and/or press in the pad switch on the
rear panel.  There are many gain adjustments in
the mixer itself and probably several others in
other system components which makes it possible
to overdrive an input section and then incorrectly
try to reduce the gain of the output section.  The
best way to approach setting gains is to establish
the operating level of input stages first by setting
their gain as high as possible but leaving about
20dB of headroom for loud peaks, then move on to
set the master gain to produce a good meter
reading.  Proceed to set the gain of equalizers,
limiters, crossovers, and amplifiers following the
mixer in the same manner, always working toward
the later stages of the system.

7.3 Excessive Noise

7.3 Excessive Noise

7.3 Excessive Noise

7.3 Excessive Noise

7.3 Excessive Noise

If the noise is in the form of hiss, the

problem is usually due to an input stage set for
insufficient gain and then compensating for it
by increasing the level.  Try increasing gain and
reducing level.  Also, check that the -20dB rear
panel pad switch is not unnecessarily enabled.

7.4 Excessive hum

7.4 Excessive hum

7.4 Excessive hum

7.4 Excessive hum

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.

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

6.5 Outputs

6.5 Outputs

6.5 Outputs

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.  For unbalanced
output, connect the shield to 

both (-) and (G).

6.6 +48V Phantom Power Switch

6.6 +48V Phantom Power Switch

6.6 +48V Phantom Power Switch

6.6 +48V Phantom Power Switch

6.6 +48V Phantom Power Switch

This switch a48VDC to all six mic

inputs for condenser microphones.  Phantom
power will not affect most dynamic mics, which
may be used along with condenser mics.

7. TROUBLESHOOTING TIPS

7. TROUBLESHOOTING TIPS

7. TROUBLESHOOTING TIPS

7. TROUBLESHOOTING TIPS

7. TROUBLESHOOTING TIPS

7.1  No Sound

7.1  No Sound

7.1  No Sound

7.1  No Sound

7.1  No Sound

Check the AC power.  Is the power switch

on?  Check the level meters.  If they are
operating, the problem is between the mixer
and the later components in the system.  If there
is no meter activity, check to see that you really
have an input signal and that it is on the desired
channel.

7.2 Distorted Sound

7.2 Distorted Sound

7.2 Distorted Sound

7.2 Distorted Sound

7.2 Distorted Sound

Something is being overdriven in the signal

path.  If the clip indicators are active, reduce the

Summary of Contents for 1662A

Page 1: ...g Pr Altec Lansing Pr Altec Lansing Pr Altec Lansing Professional ofessional ofessional ofessional ofessional 1000 W Wilshire Blvd Suite 362 Oklahoma City OK 73116 USA A division of Altec Lansing Technologies Inc Milford PA 18337 0277 Made In USA Power ...

Page 2: ...ND CABLES 5 6 6 6 6 6 REAR P REAR P REAR P REAR P REAR PANEL FEA ANEL FEA ANEL FEA ANEL FEA ANEL FEATURES TURES TURES TURES TURES 6 7 7 7 7 7 TROUBLESHOOTING TIPS TROUBLESHOOTING TIPS TROUBLESHOOTING TIPS TROUBLESHOOTING TIPS TROUBLESHOOTING TIPS 7 8 8 8 8 8 TYPICAL APPLICA TYPICAL APPLICA TYPICAL APPLICA TYPICAL APPLICA TYPICAL APPLICATION TION TION TION TION 8 9 9 9 9 9 DIMENSIONS DIMENSIONS DIM...

Page 3: ...st 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 3 AC POWER REQUIREMENTS 3 AC POWER REQUIREMENTS 3 AC POWER REQUIREMENTS 3 AC POWER REQUIREMENTS The 1662A mixer will perform normally from 93 ...

Page 4: ...s 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 4 4 Input Assign Switch 4 4 Input Assign Switch 4 4 Input Assign Switch 4 4 Input Assign Switch This switch selects the output routing for each input channel Each input ...

Page 5: ...d for individual channel insert points and RCA jacks are used for sum inputs Two conductor twisted pair shielded cable is best for all audio connections that use Euroblock assemblies Belden No 8412 or its equivalent is an excellent cable due to its heavy Power construction This type of cable should be used for all portable applications Snake cables containing multiple shielded pairs can be used fo...

Page 6: ...inimum 6 3 Channel TRS Insert 6 3 Channel TRS Insert 6 3 Channel TRS Insert 6 3 Channel TRS Insert 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...

Page 7: ...system should be plugged into the same AC circuit with a common ground Use balanced input and output connections between widely separated components 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 6 5 Outputs 6 5 Outputs 6 5 Outputs 6 5 O...

Page 8: ...o 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 9 DIMENSIONS 9 DIMENSIONS 9 DIMENSIONS 9 DIMENSIONS 9 DIMENSIONS 1662A Mic Line Mixer Four Vocal Mic Inputs EQ Limiter Crossover Amplifier etc Full Range Loudspeaker 1662A Small Sound Reinforcement System Accompaniment Tracks Cassette Player VCR CD DVD...

Page 9: ...AK INDICA PEAK INDICATORS TORS TORS TORS TORS Peak Clip indicator on each input channel and left and right outputs illuminates 3dB below clipping PHANTOM POWER PHANTOM POWER PHANTOM POWER PHANTOM POWER PHANTOM POWER 48 VDC applied to all Mic Inputs switchable on rear panel Maximum total current draw 60mA Maximum single channel current draw 10mA Gradual power up and down to eliminate pops WEIGHT WE...

Page 10: ...6dB Mid Output Level Level 5 Output Assign Input Channels 5 6 12dB max 0dB Mid Channel Level A A B B Input Clip Indicator Output Meters Servo Balanced Output Mic Input Mic Preamp 20dB Pad Mic Gain 20 40 60 Insert Point EQ Bass Treble Level G 12dB max 1 6dB Mid Output Level Level 5 Sum Input 5 R L Output A Output B Phantom Power 48V To All Mic Inputs 12 1662A Block Diagram 12 1662A Block Diagram 12...

Page 11: ...11 Operating Manual 1662A Mic Line Mixer ...

Page 12: ...tec Lansing Professional Altec Lansing Professional Altec Lansing Professional Altec Lansing Professional Altec Lansing Professional 1000 W Wilshire Blvd Suite 362 Oklahoma City OK 73116 USA A division of Altec Lansing Technologies Inc Milford PA 18337 0277 Made In USA ...

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