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Altec Lansing
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3300A
User Manual
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User Manual
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Altec Lansing 3300A User Manual

LArslSING
sound
of
3300A
Mixing Consoles
Operating Instructions
ALTEC LANSING CORPORATION
a MAKK IV company
Operating Instructions for the Altec Ixmsing 3300A Series Mixing Consoles
TABLE OF CONTENTS
1 ELECTRICAL.............................................................................................................................................................. 3
1.1 120 Vac, 50/60 Hz Power Connections.................................................................................................................
1.2 100, 220, 240 Vac, 50/60 Hz Power Connections ................................................................................................. 3
2 INSTALLATION.......................................................................................................................................................... 3
2.1 Rack Mounting................................................................................................................................................... . 3
2.2 Ventilation.................................................................................................................................................... . - 3
3 SIGNAL CONNECTIONS.......................................................................................................................................... 3
3.1 Input Connections ..............................................................................................................................................- 3
3.2 Output Connections .............................................................................................................................................. 4
3.3 Insert Connections............................................................................................................................................... 4
4 OPERATION................................................................................................................................................................ 4
4.1 Input Channel Controls
4.2 Output Section Controls........................................................................................................................................ 3
4.3 Rear Panel Input Connectors .................................................................................................................... * - ■ • 7
4.4 Rear Panel Output Connectors.............................................................................................................................. 9
4.5 Rear Panel Switches............................................................................................................................................ 10
......................................................................
-................................................................ 4
S
5 MOVEABLE REAR PANEL ON THE 3308A MIXER .......................................................................................... 11
6 WRITE-ON LABELS..................
7 SYSTEM SPECIFICATIONS
. 11
. 12
8 SERVICE INFORMATION........................................................................................................................................... 16
8.1 Ordering Replacement Parts............................................................................................................................... 16
8.2 Factory Service .................................................................................................................................................. 16
8.3 Technical Assistance........................................................................................................................................... 16
8.4 Schematics.......................................................................................................................................................... 16
8.5 Component Parts Listing .................................................................................................................................... 24
TABLE OF ILLUSTRATIONS
Figure 1. Typical input connections ........................................................................................................................... . , , . 3
Figure 2. Typical output connections .................................................................................................................................. 3
Figure 3. Typical insert connections
.................................................................................................................................. 4
Figure 4, Input channel controls........................................................................................................................................... 4
Figure 5. Output section controls ................................................................................................................................... - 6
Figure 6. Rear panel input connectors ..............................................................................................................................
8
Figure 7. Rear panel output connectors................................................................................................................................ 9
Figure 8, Rear panel switches.......................................................................................................................................... , lO
Figure 9. 8308A moveable rear panel................................................................................................................................ 11
Signal Flow Diagram......................................................................................................................................................... 13
Transformer Primary Wiring Diagram............................................................................................................................. 16
Mixing Console Wiring Diagram.................................................................................................................................. • 17
Input Board Schematic....................................................................................................................................................... 18
Sub Board Schematic......................................................................................................................................................... 19
Main Board Schematic....................................................................................................................................................... 20
Monitor Board Schematic.................................................................................................................................................. 21
Relay Board Schematic...................................................................................................................................................... 22
Power Supply Board Schematic......................................................................................................................................- 22
Display Board Schematic .................................................................................................................................................. 23
ALTEC LANSING^ CORPORATION * a Mark IV Company
Operating Instructions for the Altec Lansing 3300A Series Mixing Consoles
1 ELECTRICAL
1.1 115 Vac 50/60 Hz Operation Tlie mixing console is provided with
the voltage select switch in the 115 Vac position. Its power supply design allows it to be powered from 100 Vac to 120 Vac lines in this switch posi tion.
1.2 230 Vac 50/60 Hz Operation
The mixing console may be powered by line volta^s from 220 Vac to 240 Vac by switching the voltage select switch to tlie 230 Vac position. How ever, the ac line fuse must be changed. Refer to Table I for proper fiise value.
WARNING: Veri^ that the voltage
select switch is in the desired position, and the proper fuse is in place for the intended ac line voltage
BEFORE applying power to the
mixing console.
2 INSTALLATION
2.1 Rack Mounting The 3308A mixer may be placed in a
standard 19 inch equipment rack. It requires 17,5 inches of vertical speice (10 standard EIA vertical rack spaces). For more information on rack-mount installation, refer to Section 5 and Figitre 9 of this manual.
2.2 Ventilation
The 3300A series mixii^ consoles should not be used in areas where the ambient temperature exceeds
eO^C (140°F).
Table I. Fuse Selection Chart
I
iOO niA/250 V
300 mA)2M> V
230 niA)250 V
AC LINE
FUSE
AC LINE
VOLTAGE
100 V— 120 V
(8 anii 16 ch only)
100 V — 120 V
eh only)
220 V — 2<I0 V
3 SIGNAL CONN liCTIONS
3.1 Input Connections Balanced microphc -ne inputs may hi
made to the 3-pin XLR-^jqje con nector. Balanced line inputs may hi made to the Vi-inch phone (TRS connector. For single-ended inputs strap the low (—) input (pin 3 oi XLR or Ring on %-inch phone) h ground. Otherwise;, the electronically balanced input stage will see 5 dl less input signal level than with i balanced input. Refer to Figure 1 fo: typical input connect ions.
BALANCED LO-Z MIC
UNBALANCED LO-Z MIC
BAUINCED
LINE
LEVEL
SOURCE
UNeALANCED
LINE
LEVEL
SOURCE
m
UNBALANCED
LINE
LEVEL
SOURCE
UNBALANCED
LINE
LEVEL
SOURCE
M 1*1
J LA
HOT
HI 1+1 p
1
LC H
Y V 1
NC
jjCEL
Not recoABendfid foi* rtm? over 6 feet.
HOT
Not rocoauendeit for runs over B feet.
HPT
-e-r&
J
NC
p---------------—
J
----------------------------
-----------------
^ HI-Z
—UNBALANCED
r^LINE
J INPUT
LO-Z MIC
INPUT
LO-Z
MIC
INPUT
HI-Z
BALANCED LINE INPUT
HI-Z BALANCED LINE INPUT
1 HI-Z
BALANCED LINE INPUT
NC
1
1 balanced
Í load
:;);B ALANCEO
__
:.::3AUNCED
__
BALANCED
—1 LOAD
BALANCED
—^ LOAD
UNBALANCED
___
SERVO­BALANCED OUTPUT
SERVO­BALANCED OUTPUT
Mot reconaentfea for runs over 6 feet.
HL-Vl-
^RVO-
BALANCED OUTPUT
Not recommeniied for runs over ipo feet. BALANCED
UNBALANCED OUTPUT
Not reconnenoed for runs dver 6 feet.
UN8AU1NCED r OUTPUT ^
Not recoradended (or runs over 5 feet
UNBALANreO 1
1
--------
____________-
-------
— —
3"
CGH
OUTPUT <dll|^H!i
“i
LOAD
LOAD
^ LOAD
-
Figure 1. Typical input connections.
ALTEC LAVS/VG* CORBORATJOti • a Mark IV Company
Figure 2- Typical output connections.
Operating Instructions for the Altec Lansing 3300A Series Mixing Consoles
3.2 Output Connections The main outputs of the mixing con
sole are electronically servo­halanced. Bzilanced output connec tions may be made to the male 3-pin XLR-type connectors. For single­ended outputs, strap the low (—) output (pin 3 on XLR or Ring on ‘/cl inch phone) to ground. Otherwise, the electronically servo-balanced output stage will produce 6 dB less output signal level than with a balanced output connection. Unbalanced connections may be made to the other Vi-inch phone (TRS) connectors. Refer to Figure 2 for typical output connections.
3.3 Insert Connections Signal processing equipment may
easily be inserted in the signal path by using the Vi-inch phone (TRS) in sert connectors. The external device must have line level unbalanced in puts and outputs. The output signal from the mixing console is on the
Tip and the input signal is on the
Ring. Tlie Sleeve is ground. Refer to
Figure 3 for a typical insert
connection.
4 OPERATION
4.1 Input Channel Controls (Refer to Figure 4.)
The input channel is the beginning of the signal amplification chain of the mixer. Each input channel will accept one signal source which may be equalized, have effects added and sent to the monitor and main ^stem for the audience to hear. Each input hcis a low-impedance microphone in put (the 8-pin XLR connector) and a high-impedance microphone or line input (V«-inch phone jack). The line input will accept signals from an
instrument, high-impedance micro phone, tape/CD player, keyboard or electronic drums or eilmost any other audio source. Always make sure that the channel fader (see Figure 4)
I IMUU.ANCCO
j 1 IWVT
1 wjtS/t
EXTEBNiL EFFECTS
PROCESSOR
^
____
pL.
CHANNEL
“X
h
Y
Aid SUB
•^IS
Figure 3. Typical insert coimection.
and/or master faders (see Figure 5) are down before plugging or unplug ging input sources.
1. TRIM Control: This control adjusts the gain of the input amplifier to accommoriaie the wide variation in signal strength presented to the mixer by the endless variety of signal sources.
1110 TRIM control allows the amplification of each individual input source to be optimized. Correct setting of the TRIM control results in the best signal-to-noise ratio (no iiiss), the greatest dynamic range, and the freedom from overload dis tortion.
To set the TRIM control correctly, first set the channel fader at minimum and depress the channel PFL switch. Make sure the source (mic, instrument) that is plugged into the channel is used at its nominal performance level. Increase the TRIM level until the level of the PFL meter reaches 0 VU. Gradually bring the channel fader up to Uie desired listening level, 'iliis insures that nominal level is maintained throughout the input channel.
If the level is too low in :e
trim’s gain circuit, hiss . ill
occur. If the level is too high in the TRIM circuit, overloac' is­tortion will occur. Keeping ‘-e channel faders at nominal 1( el
with proper setting of the TT ; ' T control will keep the sy^’- n sounding its best and Is quietest.
ALTEC LANSING^ CORPORATION • a Mark IV Company
Operating Instructions for the Altec Lansing 3300A Series Mixing Consoles
2. EQ Controls: Equalization can be more simply described as so phisticated tone control. The EQ circuits used in the 3300A series have a substantial amount of sound shaping capability.
This wide range ceui be a bonus when dealing with widely­varying instrument signals, poor acoustics or other problems. The EQ should be used sparingly, however, for the best results. Too liberal use of the EQ can cause phasing problems, add noise, and use up a lot of ampli
fier power. 2A- HIGH EQ: The high EQ
circuit is a shelving type filter at 10 kHz with a ±15 dB rzuige. It controls the treble content of the input signal Turning the control counterclockwise decreases the amount of treble, clockwise increases it.
2B. MID EQ: The mid EQ cir
cuit is a peaking type filter with a ±15 dB range. It controls the midrange con tent of the input signal.
Turning the control coun
terclockwise decreases the amount of midrange, clock wise increases it.
2C. MID Frequency: The mid
frequency circuit controls the frequency range from 300 Hz to 5 kHz of the MID EQ control. By vary ing the FREQUENCY, dif ferent tonal perspectives can be created. The sweep­able frequency gives much more control flexibility.
2D. LOWEQ: The low EQ cir
cuit is a shelving type filter
at 100 Hz with a ±15 dB
range. It controls the bass
content of the input signal. Turning the control coun
terclockwise decreases the
amount of bass, clockwise
increases it.
8. MONITOR Send: The monitor send control sets the level of that input signal in the monitor mix. It is independent of all input channel controls except the TRIM control. It is not affected by the channel EQ controls or slide fader. Thus, it is independent of, zmd not affected by, changes in the main
or house mix.
4. AJJX Sends: Ilie AUX 1 send
control sets the level of that signal in the AUX 1 mix and is {x>st-fader, which means that it is affected by the gain setting of the fader. The AUX 1 send may also be used as a mono send for recording.
The AUX 2 send control sets the level of that input signal in the
AUX 2 mix and is switchable
PRE or POST fader. In the PRE position, it serves as another MONITOR OUT, and in the POST position, another EFFECTS OUT.
5. PAN Control: Short for "pan oramic potentiometer", this con trol allows the channel’s input signal to be placed within the stereo image by assigning more or less of the signal to the left or right subgroup controls. Turn ing the panpot to the left of
center moves the apparent source toward the left channel. Turning the panpot to the right of center moves the apparent source towzird the right channel. Centering the control makes the apparent source centered be tween the channels. If all inputs are panned center, the result is mono.
Some users p>an all the instru ments to one side and the vocals to the other and use the sub
group controls to valance them.
6. PFL: PFL(pre-fader listen) allows the open : to preview any pre-fader sij, individually or in combinaLi- through the headphone out . To activate the PFL simply ' >press the ap propriate switcl: The status indicator will . iit indicating which pre-fader signals are be ing monitored. hen the PFL circuit is engag ' by depressing a PFL switch, ^ th the right meter and the headphone circuit will monitor the audio level of the selected cha;:ael(s).
In the normal position (all PFL
switches off), tile right meter monitors the METER switched bus, and the headphone circuit
monitors the out put of the SUB
L and SUB outputs. The audio level of ,.he headphone
jack is controlled by the
PHONES conlrri.
7. Channel PEA^ LED: The channel PEAK IjED monitors the input channel circuit for clipping or overload (both before and after the EQ section). If it lights, the sign;:, is bordering on distortion. 'Ihis will be heard in the output as aarsh, blaring sound on voiame peaks. This might be caused by excessive
boost in he channel equalization controls, or a TRIM control setting that is too high for the input signal Generally, readjusting the TRIM control will cure '.is undesired condition.
8. Channel Fader: The slide fader controls the output level of the channel as it is fed to the subgroups. Tl.;: control should be normally set around the "0" mark (nomiiia. level). At this point, the signal level is high enough to K.eep noise from creeping in and low enough to insure plenty of headroom and
ALTEC LANSING* CORPORATION • a Mark IV Company
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