Powered Mixers
10
5
0
10
MASTER
MAINMAIN
MONITOR / MAINMONITOR / MAIN
0dB
0dB
-12dB
63Hz
160Hz
400Hz
1KHz 2.5KHz
6.4KHz
16KHz
-12dB
SIX CHANNEL POWERED MIXER
WITH 24BIT DIGITAL EFFECTS
DSP24
DIGITAL EFFECTS
BIT
PA324
Owners Manual
0
0
0
0
0
0
0
15
0
15 15
0
0
15 15
5
01
5
01
5
01
PAD
LINE
MIC
CHANNEL 1
HIGH
15
15
MID
15 15
LOW
15 15
MONITOR
0
01
EFX
0
01
LEVEL
0
01
30dB
PAD
0dB
LINE
MIC
CHANNEL 2
15
15
15
15
15
0
0
0
5
MONITOR
5
5
LEVEL
30dB
0dB
0
0
MID
MID
MID
15 15
15 15
0
0
0
0
LOW
LOW
LOW
15 15
15 15
5
5
MONITOR
MONITOR
0
0
0
01
01
5
5
EFX
EFX
EFX
0
0
01
5
01
PAD
LINE
MIC
CHANNEL 3
0
0
01
5
LEVEL
LEVEL
0
0
01
30dB
30dB
PAD
0dB
0dB
LINE
MIC
CHANNEL 4
HIGH
HIGH
HIGH
15
0
15 15
0
0
15 15
5
01
5
01
5
01
PAD
LINE
MIC
CHANNEL 5
HIGH
HIGH
15
MID
LOW
MONITOR
0
EFX
0
LEVEL
0
30dB
0dB
15
0
15 15
0
0
15 15
5
01
5
01
5
01
PAD
LINE
MIC
CHANNEL 6
17
SAMSON
26
5
3
15
4
MONITOR / MAIN
DIGITAL EFFECTS
MID
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
LOW
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
DIGITAL EFFECTS
MONITOR
0
01
EFX
0
01
LEVEL
0
01
30dB
0dB
EFX OUT
FOOTSWITCH
MAIN
DSP24
BIT
5
5
EFX SEND
0
0
01
5
TAPE IN
EFX/RETURN
0
+12dB
5
5
AUX IN
0dB
0
0
01
EFX/RETURN
-12dB
121
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
POWER
CLIP-20 -10 -7 -4 0 +6+3
MODE
MAIN
BRIDGE
ON
MAIN MAIN
OFF
MAIN
MONITOR
5
0
01
MASTER
+12dB
5
0dB
0
01
MASTER
-12dB
2
®
Safety Instructions
Caution: To reduce the hazard of electrical
shock, do not remove cover or back.
No user serviceable parts inside. Please refer all
servicing to qualified personnel.
WARNING: To reduce the risk of fire or electric shock, do not expose this unit to rain or moisture.
The lightning flash with an arrowhead symbol within an equilateral triangle, is intended to alert the user to the
presence of uninsulated "dangerous voltage" within the products enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
Important Safety Instructions
1. Please read all instructions before operating the unit.
2. Keep these instructions for future reference.
3. Please heed all safety warnings.
4. Follow manufacturers instructions.
5. Do not use this unit near water or moisture.
6. Clean only with a damp cloth.
7. Do not block any of the ventilation openings. Install in accordance with the manufacturers instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding type plug has two blades and a third grounding
prong. The wide blade or third prong is provided for your safety. When the provided plug does not fit
your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on and pinched particularly at plugs, convenience receptacles and at the point at which they exit from the unit.
11. Unplug this unit during lightning storms or when unused for long periods of time.
12. Refer all servicing to qualified personnel. Servicing is required when the unit has been damaged in any
way, such as power supply cord or plug damage, or if liquid has been spilled or objects have fallen into
the unit, the unit has been exposed to rain or moisture, does not operate normally, or has been
dropped.
FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE FUSE
CAUTION
ATTENTION
UTILISER UN FUSIBLE DE
RECHANGE DE MÊME TYPE
WARNING
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE
RISQUE DE CHOC ELECTRONIQUE
AVIS
NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Table of Contents
Introduction 2
PA324 Features 3
Controls and Functions
Front Panel Layout 4
Front Panel Controls 5–9
PA324 Input and Output Connections 10–12
Operating the PA324 13–15
System Set-ups 16–17
PA324 Wiring Guide 18
Specifications 19
Block Diagram 20
Copyright 2001, Samson Technologies Corp.
Printed June, 2001
Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 9031
Syosset, NY 11791-9031
Phone: 1-800-3-SAMSON (1-800-372-6766)
Fax: 516-364-3888
www.samsontech.com
2
Congratulations on your purchase of the Samson PA324 powered mixer! The PA324 is a six
channel, 300 Watt powered mixer with built-in, 24 BIT DSP effects. Clean, clear sound reproduction with dazzling digital effects including Delay, Chorus and lush Reverb, packaged in a
rugged enclosure, ensure reliable high quality sound from performance to performance.
Optimized for live sound reinforcement and commercial installations, the PA324 is an ideal
mixer and power amp solution offering big sound in a compact package.
In these pages, you’ll find a detailed description of the features of the PA324 powered mixer,
as well a description of its front and rear panels, step-by-step instructions for its setup and use,
and full specifications. You’ll also find a warranty card enclosed—please don’t forget to fill it out
and mail it in so that you can receive online technical support and so we can send you updated information about these and other Samson products in the future.
With proper care and adequate air circulation, your PA324 will operate trouble free for many
years. We recommend you record your serial number in the space provided below for future
reference.
Serial number:
Date of purchase:
Should your unit ever require servicing, a Return Authorization number (RA) must be obtained
before shipping your unit to Samson. Without this number, the unit will not be accepted.
Please call Samson at 1-800-3SAMSON (1-800-372-6766) for a Return Authorization number
prior to shipping your unit. Please retain the original packing materials and if possible, return
the unit in the original carton and packing materials.
Introduction
3
PA324 Features
The Samson PA324 Powered Mixer is a comprehensive, all-in-one solution for live sound applications. Here are
some of its main features:
• Six Channel Powered Mixer.
• Built-in, 24-bit DSP with 8 Selectable Presets including Reverb, Delay and Chorus.
• Advanced circuit design, utilizing low noise operational amplifiers.
• 2 x 150 Watts, or 150 Watt Main / 150 Watt Monitor, or 300 Watts Bridged Power Operating Modes.
• Six Mic / Line Inputs with 1/4” Phone and XLR Connectors.
• Low Noise Mic Pre-amps with Phantom Power.
• 3-Band EQ on Each Channel.
* Effects and Monitor Sends on Each Channel.
• Dual 7-band Graphic Equalizer For Main / Monitor.
• Tape / CD Input.
• Durable Cabinet Covered in Tough Carpet.
• Large Rubber Feet and Corners plus Convenient Handle.
• Three-year extended warranty.
0
0
0
0
0
0
0
15
0
15 15
0
0
15 15
5
01
5
01
5
01
PAD
LINE
MIC
CHANNEL 1
HIGH
HIGH
15
15
15
0
MID
MID
15 15
0
0
LOW
LOW
15 15
5
MONITOR
MONITOR
0
0
01
5
EFX
EFX
0
0
01
5
LEVEL
LEVEL
01
0
0
30dB
30dB
PAD
0dB
0dB
LINE
MIC
CHANNEL 2
15
0
15 15
0
0
15 15
5
01
5
01
5
01
PAD
LINE
MIC
CHANNEL 3
HIGH
HIGH
15
15
15
0
MID
MID
15 15
0
0
LOW
LOW
15 15
5
MONITOR
MONITOR
0
0
01
5
EFX
EFX
0
0
01
5
LEVEL
LEVEL
01
0
0
30dB
30dB
PAD
0dB
0dB
LINE
MIC
CHANNEL 4
15
15 15
15 15
01
01
01
PAD
LINE
MIC
CHANNEL 5
HIGH
HIGH
15
0
MID
0
0
LOW
5
MONITOR
0
5
EFX
0
5
LEVEL
0
30dB
0dB
15
15 15
15 15
01
01
01
PAD
LINE
MIC
CHANNEL 6
17
SAMSON
26
5
3
15
4
0
MID
0
0
LOW
5
MONITOR
0
5
EFX
0
5
LEVEL
0
30dB
0dB
DIGITAL EFFECTS
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
DIGITAL EFFECTS
01
01
01
EFX OUT
FOOTSWITCH
MONITOR / MAIN
MAIN
DSP24
BIT
5
5
EFX SEND
0
0
01
5
TAPE IN
EFX/RETURN
0
+12dB
5
5
AUX IN
0dB
01
0
0
EFX/RETURN
-12dB
121
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
POWER
CLIP-20 -10 -7 -4 0 +6+3
MODE
MAIN
BRIDGE
ON
MAIN MAIN
OFF
MAIN
MONITOR
5
0
01
MASTER
+12dB
5
0dB
01
0
MASTER
-12dB
2
4
Controls and Functions
FRONT PANEL LAYOUT
CONFIGURES THE OUTPUT
OF THE POWER AMPS
• MAIN BRIDGED 300W X 1
• MAIN DUAL 150W X 2
MASTER CONTROL FOR THE
MODE SWITCH
AMOUNT OF SIGNAL SENT
TO THE DSP
14
• MAIN / MONITOR 150W X 2
MASTER VOLUME CONFOR MAIN/MONITOR
CHANNEL
VOLUME
MASTER VOLUME CONFOR MAIN CHANNEL
RETURN
EFFECTS RETURN CONFOR MAIN/MONITOR
CHANNEL
RETURN
VOLUME
27
28
29
EFFECTS RETURN CONFOR MAIN CHANNEL
30
CONTROLS THE OVERALL
VOLUME OF THAT CHANNEL
CONTROLS THE AMOUNT
OF SIGNAL SENT TO THE
DIGITAL EFFECTS PROCESSOR
CONTROLS THE AMOUNT
OF SIGNAL SENT TO THE
MONITOR OUT (JACK 26)
CONTROLS THE AMOUNT OF
BASS APPLIED TO THAT
CHANNEL
CONTROLS THE AMOUNT OF
MIDRANGE APPLIED TO THAT
CHANNEL
POWER LED
INDICATES STATUS OF
THE POWER SWITCH
ON / OFF
13
PHANTOM POWER
PROVIDES 48 VOLTS TO
THE XLR INPUTS FOR
POWERING CONDENSOR
MICROPHONES
12
INDICATES POWER AMP
MAXIMUM LEVEL
CLIP METER
11
MASTER LED METER
INDICATES THE AMOUNT OF
OUTPUT SIGNAL
10
PROVIDES DUAL 7-BAND
EQUALIZATION FOR THE
MAIN OR MAIN / MONITOR
GRAPHIC EQ
9
2 3 4 5 6 7 8 109 11 12 13 14
DSP24
BIT
POWER
DIGITAL EFFECTS
PA3 24
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
MONITOR / MAIN
SAMSON
POWERED MIXER
26
17
3
0
4
EFFECTSEFFECTS
5
DIGITAL EFFECTS
0 LARGE HALL
1 MEDIUM HALL
MID
HIGH
15
0
0
15
CHANNEL 6CHANNEL 6
MID
HIGH
15
0
0
15
CHANNEL 5CHANNEL 5
MID
HIGH
15
0
0
15
CHANNEL 4CHANNEL 4
MID
HIGH
15
0
0
15
CHANNEL 3CHANNEL 3
MID
HIGH
15
0
0
15
CHANNEL 2CHANNEL 2
MID
HIGH
15
0
0
15
CHANNEL 1CHANNEL 1
MAIN
MONITOR
MODE
MAIN
MAIN MAIN
BRIDGE
ON
OFF
MAIN
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
6 CHORUS + DELAY
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
+12dB
MONITOR / MAINMONITOR / MAIN
+12dB
EFX
7 STAIRWELL
15 15
15 15
15 15
15 15
15 15
15 15
5
5
EFX SEND
5
MONITOR
5
MONITOR
5
MONITOR
5
MONITOR
5
MONITOR
5
MONITOR
5
10
MASTER
0
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
0dB 0dB
-12dB
10
RETURN
0
10
TAPE IN
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
MAINMAIN
+12dB
10
5
MASTER
0
-12dB
1
2
1
2
TAPE I NAUX IN MAIN OUT MONITOR OUTREC OUT
AUX IN CONTROL
CONTROLS THE AMOUNT
20
22
EFFECTS OUTPUT JACK FOR
EFX OUT
19
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
0dB 0dB
-12dB
+12dB
10
5
RETURN
0
EFX
10
10
AUX IN
5
0
0
LEVEL
10
10
OUT
5
0
0
LEVEL
10
10
OUT
5
0
0
LEVEL
10
10
OUT
5
0
0
LEVEL
10
10
OUT
5
0
0
LEVEL
10
10
OUT
5
0
0
LEVEL
10
10
OUT
5
0
0
EFX OUT
FOOTSWITCH
MIC
LINE
IN
MIC
LINE
IN
MIC
LINE
IN
MIC
LINE
IN
MIC
LINE
IN
PAD PAD PAD PAD PAD
MIC
LINE
IN
PAD
EFFECTSEFFECTS
CHANNEL 6
CHANNEL 5
CHANNEL 4
CHANNEL 3
CHANNEL 2
CHANNEL 1
17 20 2118 19 26252423
15 16
SWITCHES THE EFFECTS
FOOTSWITCH
18
INPUT ATTENUATION SWITCH
PAD
17
INPUT FOR LINE LEVEL
LINE INPUT
16
MONITOR OUT
MONITOR SIGNAL
OF SIGNAL IN FROM AN
EXTERNAL AUDIO SOURCE
OUTPUT CONNECTOR
26
MAIN OUT
MIXER PREAMP SIGNAL
CONNECTING AN EXTERNAL
EFFECTS PROCESSOR
OUTPUT CONNECTOR
25
REC OUT
OUTPUT USED TO SEND
MAIN MIX TO AN EXTERNAL
ON OR OFF
RECORDER
24
USED TO CONNECT INPUT
FROM A TAPE DECK / CD / MD
TAPE IN
23
INPUT FOR MIXING
EXTERNAL SIGNALS
AUX I N
SIGNALS
22
CONTROLS THE AMOUNT OF
TREBLE APPLIED TO THAT
CHANNEL
SELECTS ONE OF THE EIGHT
DIGITAL EFFECTS
8
DIGITAL EFFECTS PRESETS
AVAILABLE
1
INPUT CONNECTOR FOR
LOW IMPEDANCE
BALANCED MICROPHONE
INPUT
XLR INPUT
15
CONTROLS THE AMOUNT OF
VOLUME FROM AN EXTERNAL
TAPE SOURCE
TAPE IN CONTROL
21
5
Controls and Functions
INPUT CHANNEL SECTION
The following section details each part of the PA324’s INPUT CHANNELS
including the 3-BAND EQ, the MONITOR and EXF sends, PAD and LEVEL
controls.
Channel Equalizer (HIGH MID LOW)
The PA324 input channels feature a 3-band equalizer allowing you to
adjust the high, mid, and low frequencies independently on each channel. The channel’s frequency response is flat when the knobs are in the
"12:00" position. Rotating the knob towards the right will boost the corresponding frequency band by 15dB, and rotating it towards the left will cut
the frequency by 15dB. The frequency centers, range of boost or cut,
and equalizer type for each band are as follows:
High: 12KHz +/- 15dB shelving type
Mid: 2.5KHz +/- 15dB peaking type
Low: 80Hz +/- 15dB shelving type
Monitor Send (MONITOR)
Each of the PA324’s channels include a MONITOR send which controls
the amount of that channel’s signal that is sent to the MONITOR bus.
The Input channel’s MONITOR sends are mixed together and are sent to
the speakers connected to the POWER AMP 2 A/B jacks if the POWER
AMP select switch is set to MAIN+MONITOR.
Effects Send (EFX)
The PA324 provides high quality, 24 Bit digital effects, and the level of effects can be set independently on
each channel. The channel’s EFX (Effects) knob controls the amount of signal that is sent to the EFX bus.
The signal of the EFX bus is routed to the DSP EFX section for onboard signal processing. The EFX signal can also be sent to an external effect device connected to the EFX OUT jacks located on the front
panel.
NOTE: The channel’s EFX signal is sent to the EFX bus from a location in the signal path after
the LEVEL
control (4). This is commonly referred as a POST FADER send. This means that the amount of signal
that is sent to the EFFECT bus will be affected not only by the setting of the EFX knob control, but it will
also be affected by the setting of the LEVEL control.
Level Control (LEVEL)
The LEVEL control adjusts the output volume of each channel.
Pad Switch (PAD)
The PAD switch attenuates the input signal by 30dB. When connecting a hot signal such as a line level
device to channels 1-6, or if the mic input is distorted, turn this switch on (the pressed-in position) and
readjust the LEVEL control.
1
2
3
4
5
1
2
3
4
5
FRONT PANEL CONTROLS
CHANNEL 1CHANNEL 1
0
15
0
15 15
0
0
15 15
5
MONITOR
0
5
0
5
0
OUT
IN
PAD
HIGH
15
LOW
10
10
LEVEL
10
MID
EFX
6
Effect Select Switch (DIGITAL EFFECTS)
The EFX switch allows you to select one of the eight built-in digital effects.
Simply rotate the EFX to choose the effect.
Effect Preset List
This section identifies the eight built- in DSP effects presets.
Master Effect Send (EFX SEND)
The EFX SEND control is used to send the effect mix bus to an external effect
device connected to the EFX OUT jack.
6
7
8
6
7
8
Tape In Level Control (TAPE IN)
This adjusts the amount of signal that is sent from the TAPE IN jacks to the
MAIN bus.
Aux In Control (AUX IN)
This adjusts the amount of signal that is sent from the AUX IN jacks to the
MAIN bus.
9
10
10
9
Controls and Functions
TAPE IN AND AUX IN SECTION
This allows you to adjust the level of the signal from an external device such
as a cassette recorder, or CD player or from an external effect device.
FRONT PANEL CONTROLS
24 BIT DIGITAL EFFECT SECTION
The PA324 features a built-in, 24 Bit Digital Effects processor with high quality,
studio grade effects like Delay, Chorus and Reverb. The following section
describes the features of the powerful on-board DSP.
EFFECTSEFFECTS
5
DIGITAL EFFECTS
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
0
17
26
3
4
5
EFX SEND
5
EFX SEND
5
TAPE IN
10
10
0
0
5
10
AUX IN
0
0
10
7
MONITOR SECTION
The PA 324 has two internal power amplifiers and
depending on the MODE selection switch, the amplifiers are fed from the MAIN or MONITOR bus signal.
The following section describes the MONITOR bus
operation, which allows you to adjust the overall tone
and volume, and specify the mix level of the built-in
effects.
Graphic Equalizer
The PA324’s 7-band Graphic Equalizer allows
you to contour the frequency response of the
MONITOR bus signal, providing a maximum of
+/-12dB of cut/boost for each frequency band.
This is an especially useful tool for cutting frequencies that cause annoying feedback. The
frequency response is flat when the sliders are
in the center position. Moving a slider in the
positive direction will boost that frequency by as
much as 12dB, and moving the slider in the
negative direction will cut that frequency by up
to 12dB. Once you set a frequency response
curve using the Graphic Equalizer, the EQ curve
is applied to both the MONITOR bus signal that
is sent to the monitor speakers, and the line
level signal which is sent from the MONITOR
OUT jack.
Effects Return Control (EFX RETURN)
The EFX RETURN control is used to adjust the level of the effect sound being sent back from the built-in
digital effect to the MONITOR bus. This allows you to hear the DSP effects in your monitor speakers.
Volume Control (MASTER)
The VOLUME level control is the overall master control for the MONITOR bus. The MONITOR level affects
both the MONITOR bus signal which is sent to the monitor speakers and the line level signal which is sent
from the MONITOR OUT jack.
Output Level Meter
The OUTPUT LEVEL METER allows you to monitor the level of the signal which is being sent to the MONITOR OUT jack and MONITOR POWER AMPLIFIER.
NOTE: To avoid distortion, adjust the VOLUME level control so that the 0 indicator LED lights occasionally.
11
12
13
14
11
12
13
14
Controls and Functions
FRONT PANEL CONTROLS
SAMSON
POWERED MIXER
MONITOR / MAIN
+12dB
EFX
5
EFX
0dB 0dB
10
0
RETURN
-12dB
+12dB
5
0dB 0dB
10
0
RETURN
-12dB
PA3 24
MAIN
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
MONITOR / MAINMONITOR / MAIN
MAINMAIN
1
2
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
1
2
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
DSP24
BIT
DIGITAL EFFECTS
POWER
MODE
BRIDGE
ON
MAIN MAIN
OFF
MAIN
+12dB
0
VOLUME
-12dB
+12dB
0
VOLUME
-12dB
5
5
MAIN
MONITOR
10
10
8
MAIN SECTION
The PA 324 has two internal power amplifiers and
depending on the POWER AMP selection switch, the
amplifiers are sent the MAIN or MONITOR bus signal. The following section describes the MAIN bus
operation, which allows you to adjust the over-all
tone and volume, and specify the mix level of the
built-in effects.
Graphic Equalizer
The PA324’s 7-band Graphic Equalizer allows
you to contour the frequency response of the
MAIN mix bus signal, providing a maximum of
+/-12dB of cut/boost for each frequency band.
This is an especially useful tool for cutting frequencies that cause annoying feedback. The
frequency response is flat when a slider are in
the center position. Moving a slider in the positive direction will boost that frequency by as
much as 12dB, and moving the slider in the
negative direction will cut that frequency by up
to 12dB. Once you set a response curve using the Graphic Equalizer, the EQ curve is applied to both the
MAIN bus signal that is output to the speakers, and the line level signal which is output from the MAIN OUT
jack.
Effects Return Control (EFX RETURN)
The EFX RETURN control is used to adjust the level of the effect sound being sent back from the built-in
digital effect to the MAIN mix bus. This allows you to hear the DSP effects in your monitor speakers.
Volume Control (MASTER)
The MASTER MAIN level control is the over-all volume control for the MAIN bus. The MAIN level affects
both the MAIN bus signal which is output to the speakers and the line level signal which is output from the
MAIN OUT jack.
Output Level Meter
The OUTPUT LEVEL METER allows you to monitor the level of the signal which is being sent to the MAIN
OUT jack (input/output panel 5).
NOTE: To avoid distortion, adjust the MASTER LEVEL control so that the 0 indicator LED lights occasionally.
15
16
17
18
15
16
17
18
Controls and Functions
FRONT PANEL CONTROLS
SAMSON
POWERED MIXER
MONITOR / MAIN
MAIN
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
PA3 24
DIGITAL EFFECTS
POWER
EFX
EFX
+12dB
5
0dB 0dB
10
0
RETURN
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
+12dB
5
0dB 0dB
10
0
RETURN
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
MONITOR / MAINMONITOR / MAIN
MAINMAIN
1
1
2
2
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
DSP24
BIT
BRIDGE
ON
MAIN MAIN
OFF
MAIN
+12dB
-12dB
+12dB
-12dB
0
VOLUME
0
VOLUME
MODE
5
5
MAIN
MONITOR
10
10
9
POWER AMP SECTION
The PA324’s power amplifier section can
be configured to operate several ways
depending on whether you need MAIN plus
MONITOR amplifiers to power your speakers, or if you just need more power for the
MAIN speakers. The section below
describes the PA324 power amp modes.
Mode
The MODE switch is used to select one of
three different operating modes, MAINMONITOR, MAIN-MAIN and MAINBRIDGE. The following is a description of
each of the POWER operating modes:
CAUTION! Only change the power amp mode switch when the PA324’s power is SWITCHED OFF!
MAIN-MONITORS
With this setting, the MAIN and MONITOR sections can be used independently. The MAIN bus signal will
be sent from the POWER AMP 1 A/B jacks, and the MONITOR bus signal will be sent from the POWER
AMP 2 A/B jacks.
MAIN-MAIN
With this setting, the two power amp channels can be used independently. The MAIN bus signal will be
output from the POWER AMP 1 A/B jacks (Rear Panel 1), and also, from the POWER AMP 2 A/B jacks
(Rear Panel 1).
MAIN-BRIDGE
With this setting, the two power amp channels (A and B) will be connected in bridge mode. Only the MAIN
bus signal will be output from the BRIDGE jack.
19
19
Controls and Functions
FRONT PANEL CONTROLS
PA324
DSP24
DIGITAL EFFECTS
BIT
PHANTOMCLIP
POWER
ON
OFF
BRIDGE
MODE
MAIN MAIN
MAIN
MAIN
MONITOR
+12dB
0dB
5
0
10
PA324 Input and Output Connections
10
CHANNEL 1–6 MIC and LINE INPUTS
The PA 324’s six input channels each have a Hi-Z (High Impedance) Line level input and a Low-Z(Low impedance) Mic level input. By using the PAD switches you can connect a variety of signal sources from microphones
to line level devices such as synthesizers, drum machines and direct boxes. Both Hi-Z and Low-Z inputs are
balanced, with Lo-Z inputs compatible with microphones of output impedance 50~600 Ohms and Hi-Z inputs
compatible with line level devices of 600 Ohms.
NOTE
: It is not possible to simultaneously use both the Hi-Z and Low-Z inputs on the same channel. For each
channel, use only one
of the inputs as appropriate for the input source.
1
1
3
3
4
4
5
5
6
6
2
7
8 9
2
Hi-Z Line Level Input
Use these inputs to connect high impedance microphones, synthesizers and drum machines. The Hi-Z
inputs have a nominal operating level of -40dB through - 10dB.
TRS phone jacks Connector pin-out - Sleeve: Ground, Tip: Hot (+), Ring: Cold (-)
Low-Z Microphone Input
Use these inputs to connect Low Impedance microphones and low level signals from direct boxes. The
Low-Z inputs have a nominal operating level of –50dB through -20dB. The Low-Z feature +48V phantom
power, allowing you to use condenser microphones. The Phantom Power is switched on/off simultaneously
for channels 1 through 6.
XLR Connector pin-out - Pin 1: Ground, Pin 2: Hot (+), Pin 3: Cold (-)
Effects Output (EFX OUT)
The EFX output is used to interface an external signal processor like a delay or reverb. The signal present
at the EFX output is sent from the EFFECTS bus, which is fed from the EFX send on the input channels
and the EFX send in the Master section.
Footswitch Jack (FOOTSWITCH)
With a foot switch connected to this jack, you can turn on and off the onboard digital effects by simply
pressing the switch with your foot.
Auxiliary Input (AUX IN)
Used to connect monaural output devices such as external effects processors.
Tape Input (TAPE IN)
Used to connect a stereo output device such as cassette recorder or CD player.
EXTERNAL INPUT JACKS (AUX IN/TAPE IN)
These are input jacks that allow the signal from an external device to be added to the MAIN output.
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
CHANNEL 1
CHANNEL 2
CHANNEL 3
CHANNEL 4
LINE
MIC
CHANNEL 5
LINE
MIC
CHANNEL 6
EFX OUT
FOOTSWITCH
EFFECTSEFFECTS
1
2
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
1
2
Record Output (REC OUT)
The signal present at this connector is the MAIN bus signal before it has passed through the MASTER level
control and graphic equalizer. The nominal output level is -10dB and the impedance is10K Ohms.
MAIN OUT
The signal present at this connector is the MAIN bus signal, which has passed through the MAIN MASTER
level control and the graphic equalizer. The nominal output level is +4dB and the impedance is10K Ohms.
MONITOR OUT
The MONITOR bus signal is present at this connector. The signal is passed through the MONITOR /MASTER level control and graphic equalizer before it reaches the MONITOR OUT connector. The nominal output level is +4dB and the impedance is10K Ohms.
PA324 Input and Output Connections
11
7
8
BABA
SPEAKER
BRIDGE
CAUTION;
DO NOT CONNECT ANYTHING TO TERMINAL A OR B WHEN USING BRIDGE MODE
AMP 2
AMP 1
REAR PANEL
The PA324 contains two mono power amplifiers and depending on the operating mode, the two amplifiers can
be used independently (maximum output 150W + 150W) or in BRIDGE mode (maximum output 300W).
NOTE
: Use the MODE switch to select which signal is sent to the speaker output jacks, and to activate BRIDGE mode.
If the two power amplifiers are used for MAINS operation, two speakers can be connected to the AMP 1 A/B
jacks and two more to the AMP 2 A/B jacks, for a total of four speakers.
NOTE
: When using the A and B jacks simultaneously, connect 8 through 16 Ohm speakers. In this case, be care-
ful not to connect a speaker to the BRIDGE jack.
The total impedance load for each amplifier must not exceed 4 Ohms, therefore in the example above, one
speaker with an impedance of 8 ohms is connected to each amp’s A and B jacks. (The A/B jacks are wired in
"Parallel", so the total impedance when two 8 Ohm speakers are connected is 4 Ohms.)
If you wish to use two amplifiers independently, let’s say for Main and Monitor operation, but only connect a single speaker to the A or B jack, use a 4 through 8 Ohm speaker. Again, the total impedance load for each amplifier must not exceed 4 Ohms, therefore one speaker with an impedance of 8 ohms can be connected to each
amp’s A and B jacks.
If the two amplifiers are used in a BRIDGE mode, only one speaker can be connected to the BRIDGE jack. The
total impedance load while operating in Bridge mode must not be less than 8 Ohms.
If you are connecting a speaker to the BRIDGE jack, use an 8 through 16 Ohm speaker.
CAUTION: When using a bridge connection, do not connect anything to the AMP 1 and AMP 2 jacks. Likewise,
when using the POWER AMP 1 and POWER AMP 2 jacks, do not connect anything to the BRIDGE jack.
9
EXTERNAL OUTPUT JACKS
The PA324 features several output connectors allowing you to interface a variety of external devices. A stereo
recording device such as a cassette recorder can be connected to the REC OUT jacks, and additional power
amplifiers can be connected to the MONITOR and MAIN output jacks.
12
SPEAKER CONNECTION
Here are three ways in which speakers can be connected to the PA324: A single speaker can be connected to
either the A or B jack of AMP 1 and AMP 2, two speakers can be connected in parallel to both the A and B jacks
of AMP1 and AMP 2, or a single speaker can be connected to the BRIDGE jack (bridge connection). For each of
these, the required speaker impedance will differ.
Refer to the following diagram, and make sure that the speaker impedance is not less than the specified value.
Additional, or alternative amplifiers can be connected to the MAIN OUT and MONITOR OUT jacks on the front
panel.
PA324 Input and Output Connections
When connecting one
speaker to POWER AMP 1
and one speaker to
POWER AMP 2, use
speakers with a 4 – 8 ohm
impedance rating.
When connecting two
speakers to POWER AMP
1 and two speaker to
POWER AMP 2, use
speakers with a 8 – 16
ohm impedance rating.
When the POWER AMP S
are in BRIDGE use a
speakers with a 4 – 8 ohm
impedance rating.
SPEAKER
BRIDGE
AMP 2
4 - 8 Ohms
AIN/MONITOR
SPEAKER
AMP 1
BABA
4 - 8 Ohms
MAIN
SPEAKER
SPEAKER
BRIDGE
AMP 2
8 - 16 Ohms
MAIN/MONITOR
SPEAKER
AMP 1
BABA
8 - 16 Ohms
MAIN
SPEAKER
SPEAKER
BRIDGE
MAIN
AMP 1
BABA
AMP 2
8 - 16 Ohms
SPEAKER
Operating the PA324
13
BASIC OPERATION
The following section explains the basic operation of the PA324.
CONNECTING MICROPHONES AND INSTRUMENTS
1. Before connecting mics or instruments,
make sure that the power of all your systems components including the PA324 is
turned off. Also, make sure that the level
controls of each channel of the PA324
and the VOLUME control of the MAIN
section are turned all the way down.
2. Connect the cables to your microphones
and instruments, and insert the other end
of the cable firmly into the appropriate
input on the PA324.
NOTE: When connecting a line level device
to channels 1 through 6, it’s a good idea to
start with the pad switch on. (Note: You
cannot use a channel’s Lo-Z and Hi-Z jacks
at the same time.)
3. Switch on the power of any peripheral
devices, and then power up the PA324.
NOTE: Since the PA324 contains two
power amplifiers, it is important to remember the Golden Rule of audio … " LAST
ON, FIRST OFF". Translated, this means that when turning on your system, you should always turn your power
amplifiers on LAST, and when turning your system off, turn your power amps off FIRST. This helps avoid any
loud pops caused by rush current at power up, which can sometimes damage loudspeakers .
4. Set the VOLUME control of the MAIN section to the "5" position.
5. While speaking into the mic (or playing the instrument), adjust the channel LEVEL control so that the "O" LED
of the MAIN section peak level meter lights occasionally.
6. If you wish to adjust the tone of each channel, adjust the equalizer controls as desired.
7. Use the MAIN section graphic equalizer and VOLUME control to adjust the overall volume and tone.
CHANNEL 2CHANNEL 2
CHANNEL 1CHANNEL 1
0
0
HIGH
15
15
15
0
0
MID
15 15
15 15
0
0
0
0
LOW
15 15
15 15
5
5
MONITOR
0
0
10
5
5
EFX
10
0
0
5
5
LEVEL
10
0
0
OUTINOUTINOUTINOUTINOUTINOUT
IN
PAD
PAD PAD PAD PAD PAD
LINE
LINE
MIC
MIC
CHANNEL 2
CHANNEL 1
CHANNEL 4CHANNEL 4
CHANNEL 3CHANNEL 3
0
HIGH
HIGH
15
15
15
15
0
MID
MID
15 15
15 15
0
0
LOW
LOW
15 15
15 15
5
MONITOR
MONITOR
0
0
10
10
5
EFX
EFX
10
10
0
0
5
LEVEL
LEVEL
10
10
0
0
LINE
LINE
MIC
MIC
CHANNEL 4
CHANNEL 3
CHANNEL 6CHANNEL 6
CHANNEL 5CHANNEL 5
0
0
HIGH
15
15
0
0
MID
15 15
0
0
0
0
LOW
15 15
5
5
MONITOR
0
10
5
5
EFX
10
0
5
5
LEVEL
10
0
LINE
MIC
CHANNEL 5
EFFECTSEFFECTS
0
0
HIGH
HIGH
15
MID
LOW
MONITOR
10
EFX
10
LEVEL
10
15
15 15
15 15
0
0
0
CHANNEL 6
17
SAMSON
26
POWERED MIXER
5
3
15
4
0
MID
0
0
LOW
5
MONITOR
10
5
EFX
10
5
LEVEL
10
LINE
MIC
DIGITAL EFFECTS
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
0
0
0
EFX OUT
FOOTSWITCH
EFFECTSEFFECTS
MONITOR / MAIN
+12dB
EFX
5
5
EFX SEND
0dB 0dB
0
10
10
5
TAPE IN
RETURN
-12dB
10
+12dB
EFX
5
5
AUX IN
0dB 0dB
10
10
0
RETURN
-12dB
MAIN
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
MONITOR / MAINMONITOR / MAIN
MAINMAIN
121
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
PA324
DSP24
BIT
DIGITAL EFFECTS
POWER
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
MODE
BRIDGE
MAIN
ON
MAIN MAIN
OFF
MONITOR
MAIN
+12dB
5
0
10
VOLUME
-12dB
+12dB
5
10
0
VOLUME
-12dB
2
SIGNAL FLOW
SIGNAL FLOW
SIGNAL FLOW
SIGNAL FLOW
SIGNAL FLOW
SIGNAL FLOW
S
A
M
S
O
N
R
2
1
Vocal Vocal
S
A
M
S
O
N
R
2
1
Signal Processor
Rhythm Guitar
Direct Box
Bass Guitar
Signal Processor
Lead Guitar Keyboards
Operating the PA324
14
USING THE DIGITAL EFFECTS
The PA324 features a built-in, high quality, 24 BIT Digital Signal Processor offering studio grade effects. The
DSP features clean Delay, lush Reverbs and multi-effects like Chorus + Delay or Chorus + Reverb. The following details the operation of the internal DSP effects:
1. Connect a mic or instrument to the desired channel, and adjust the volume and
equalizer to your liking.
2. Now select the desired preset on the DSP selection switch. Set the DSP selection
switch to one of the following effects:
1 - Large Hall
2 - Medium Hall
3 - Large Room
4 - Vocal Room 1
5 - Vocal Room 2
6 - Chorus + Reverb
7 - Chorus + Delay
8 - Stairwell
4. Once you have selected the desired effect preset, raise the EFX control on the channels you wish to apply the
digital effect to.
5. Now use the EFX RTN knob in the MAIN/MONITOR section to adjust the EFFECTS Return level. The EFX
control is the overall level control for the DSP effects processor. If you are not using the PA324 in MAIN/ MONITOR or BRIDGE mode, be sure to raise the EFX RTN control up on both the MAIN and MAIN/ MONITOR sections so the level of effect is the same in both speakers.
NOTE
: If the effect sound is distorted even though the EFX RTN is turned all the way down, lower the EFX con-
trols of each channel, or lower the EFX SEND control in the EFFECTS section.
SENDING AN INDEPENDENT MIX TO THE MONITOR SPEAKERS
The PA324 allows you to operate the power amplifiers
in a MAIN/ MONITOR mode. This let you use one
amplifier for speakers facing the audience, and the
other amplifier for the monitor speaker facing the
musicians.
1. Set the MONITOR section and VOLUME control to
the "0" position.
2. Raise the MONITOR controls for the channels that
you wish to hear from the monitor speakers.
NOTE
: The MONITOR controls are not affect-
ed by the level settings of each channel. This
allows you to create a mix for the monitors that is independent of the MAIN mix.
3. Use the graphic equalizer and VOLUME controls of the MAIN/MONITOR sections to adjust the overall volume
and tone.
EFFECTSEFFECTS
0
17
26
5
DIGITAL EFFECTS
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
3
4
MONITOR / MAIN
EFX
EFX
0
RETURN
0
RETURN
MAIN
+12dB
5
0dB 0dB
10
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
+12dB
5
0dB 0dB
10
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
MONITOR / MAINMONITOR / MAIN
MAINMAIN
POWER
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
BRIDGE
ON
MAIN MAIN
OFF
MAIN
+12dB
-12dB
+12dB
-12dB
MODE
0
VOLUME
0
VOLUME
MAIN
MONITOR
5
10
5
10
Operating the PA324
15
USING AN EXTERNAL EFFECT
If you prefer to use an external device for effects processing, you can easily connect the unit using the PA324 EFX
bus. Follow the simple steps below to interface your
processor:
1. Set the MONITOR section VOLUME control to the "0"
position.
2. Raise the EFFECT controls for the channels to which
you want the external effect to be applied.
3. Now adjust the EFX SEND level to about half way.
4. Set the input level of the external effect so that the sound
is not distorted and so that the effect’s input meter does
not indicate a clipped signal.
5. Use the AUX IN control to adjust the level of the effects
processed by the external effects device.
PLAYING BACK A CD
The PA324 has a dedicated input for playing back a CD,
Tape or Mini Disk. Below is a description of how you can
play back a CD, Tape or MD using the PA324’s TAPE
INPUT.
1. Turn the TAPE IN level control and the VOLUME level
control all the way down.
2. Follow the "LAST ON, FIRST OFF" rule and turn on your
peripheral devices and then the power on the PA324.
3. Adjust the VOLUME control of the MAIN section to the
"5" position.
4. Start playback on the CD, Tape or MD player, and use
the TAPE IN control to adjust the level so that the zero
LED of the MAIN section peak level meter lights occasionally. Adjust the master volume control to raise the
level if necessary.
RECORDING FROM THE PA324
You can record the audio from the PA324’s mixer section
including the MIC, LINE, TAPE IN and AUX inputs to a cassette deck, MD, DAT or any other type of recorder using the
RECORD outputs. Simply connect the PA324’s REC OUT
to the input jacks of the recorder as shown in the diagram above.
G
O
F
L
M
NNEL 2NNEL 2
0
15
0
15
0
0
15
5
MONITOR
10
5
10
5
LEVEL
10
OUTINOUTINOUTINOUTINOUT
INE
IC
NNEL 2
CHANNEL 4CHANNEL 4
CHANNEL 3CHANNEL 3
0
0
HIGH
HIGH
HIGH
MID
LOW
EFX
15
15
15
15
0
0
MID
MID
15 15
15 15
0
0
0
0
LOW
LOW
15 15
15 15
5
5
MONITOR
MONITOR
10
10
0
0
5
5
EFX
EFX
10
10
0
0
5
5
LEVEL
LEVEL
10
10
0
0
PAD PAD PAD PAD
LINE
LINE
MIC
MIC
CHANNEL 4
CHANNEL 3
CHANNEL 5CHANNEL 5
15
15 15
15 15
0
0
0
CHANNEL 5
CHANNEL 6CHANNEL 6
EFFECTSEFFECTS
0
0
0
HIGH
HIGH
15
0
MID
0
0
LOW
5
MONITOR
10
5
EFX
10
5
LEVEL
10
LINE
MIC
15
15 15
15 15
0
0
0
CHANNEL 6
17
SAMSON
26
POWERED MIXER
5
3
15
4
0
DIGITAL EFFECTS
MID
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
0
0
LOW
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
5
MONITOR
10
5
EFX
10
5
LEVEL
10
LINE
MIC
0
0
0
EFX OUT
FOOTSWITCH
EFFECTSEFFECTS
MONITOR / MAIN
EFX
+12dB
5
5
EFX SEND
0dB 0dB
10
10
0
5
TAPE IN
RETURN
-12dB
10
+12dB
EFX
5
5
AUX IN
0dB 0dB
10
10
0
RETURN
-12dB
MAIN
MONITOR / MAINMONITOR / MAIN
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
121
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
PA324
DSP24
BIT
DIGITAL EFFECTS
POWER
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
MODE
BRIDGE
MAIN
ON
MAIN MAIN
OFF
MONITOR
MAIN
+12dB
5
10
0
VOLUME
-12dB
MAINMAIN
+12dB
5
10
0
VOLUME
-12dB
2
INPUT OUTPUT
Signal Processor
CHANNEL 4CHANNEL 4
CHANNEL 3CHANNEL 3
0
0
HIGH
HIGH
H
ID
W
R
X
EL
15
15
15
15
0
0
MID
MID
15 15
15 15
0
0
0
0
LOW
LOW
15 15
15 15
5
5
MONITOR
MONITOR
0
0
10
10
5
5
EFX
EFX
10
10
0
0
5
5
LEVEL
LEVEL
10
10
0
0
OUTINOUTINOUTINOUT
IN
PAD PAD PAD PAD
LINE
LINE
MIC
MIC
CHANNEL 4
CHANNEL 3
CHANNEL 5CHANNEL 5
15
15 15
15 15
0
0
0
CHANNEL 5
CHANNEL 6CHANNEL 6
HIGH
15
0
MID
0
0
LOW
5
MONITOR
10
5
EFX
10
5
LEVEL
10
LINE
MIC
15
15 15
15 15
0
0
0
CHANNEL 6
17
SAMSON
26
POWERED MIXER
5
3
15
4
0
MID
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
0
0
LOW
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
5
MONITOR
10
5
EFX
10
5
LEVEL
10
LINE
MIC
DIGITAL EFFECTS
0
0
0
EFX OUT
FOOTSWITCH
EFFECTSEFFECTS
MONITOR / MAIN
EFX
+12dB
5
5
EFX SEND
0dB 0dB
10
10
0
5
TAPE IN
RETURN
-12dB
10
+12dB
EFX
5
5
AUX IN
0dB 0dB
10
10
0
RETURN
-12dB
MAIN
MONITOR / MAINMONITOR / MAIN
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
121
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
EFFECTSEFFECTS
0
0
0
HIGH
PA324
DSP24
BIT
DIGITAL EFFECTS
POWER
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
MODE
MAIN
BRIDGE
ON
MAIN MAIN
OFF
MONITOR
MAIN
+12dB
5
10
0
VOLUME
MAINMAIN
-12dB
+12dB
5
10
0
VOLUME
-12dB
2
OUTPUT
CD PLAYER
RECORD
INPUT
CASSETTE RECORDER
PA324 System Set-Ups
16
This system shows the
PA324 power amp oper-
ating in MAIN/MAIN
mode, with one speaker
connected to POWER
AMP 1 and one speaker
connected to POWER
AMP 2. The MONITOR
OUT is connected to an
external power amp,
which is driving 2 moni-
tor speakers. For inputs,
two microphones are
connected to channel 1
and 2’s low-impedance
inputs, and the output of
the Bass Direct Box is
also connected to the
Low-Impedance input on
channel 4. The
Keyboards, as well as, the
Lead and Rhythm Guitar
signal processors’ out-
puts are connected to the
PA324’s line inputs.
PA324’s MONITOR OUT
connected to an external
monitor amp.
LEFT
RIGHT
INPUTS
(BALANCED
10KΩ/0dBm0)
MONO STEREO
BRIDGED
SAMSON TECHNOLOGIES CORP., HICKSVILLE, NEW YORK
SERVO 550 STUDIO AMPLIFIER
!
LEFT+
GROUND
CAUTION
DO NOT OPEN
OUTPUT 250W/4Ω
RISK OF ELECTRIC SHOCK
+RIGHT
SERIAL
NUMBER
F
U
S
E
FUSE
CAUTION
6A/250V (230V)
12A/250V (115V)
HEATSINK MAY BE
FUSE RATING
AIRFLOW OR OVER-
HOT! DO NOT BLOCK
HEATING MAY OCCUR
USE CLASS 2 WIRING MAXIMUM LOAD IMPEDANCE 4Ω
TO PREVENT SHOCK DO
NOT OPEN. NO USER
SERVICABLE PARTS
INSIDE. REFER SERVICING
TO QUALIFIED SERVICE
PERSONNEL. TO PREVENT
TIP +
RING -
SLEEVE GND
TIP RING SLEEVE
~AC INPUT
115V/230W, 50/60HZ
510W (115V)900W (230V)
LEFT
RIGHT
OUTPUT
POWER AMP 2
OUTPUT
POWER AMP 1
DSP24
BIT
PA324
SAMSON
17
0
EFFECTSEFFECTS
HIGH
0
CHANNEL 6CHANNEL 6
HIGH
0
CHANNEL 5CHANNEL 5
HIGH
0
CHANNEL 4CHANNEL 4
HIGH
0
CHANNEL 3CHANNEL 3
HIGH
0
CHANNEL 2CHANNEL 2
HIGH
0
CHANNEL 1CHANNEL 1
MAIN
MONITOR
MODE
MAIN
MAIN MAIN
BRIDGE
ON
OFF
POWER
DIGITAL EFFECTS
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
MAIN
MONITOR / MAIN
POWERED MIXER
26
3
4
5
DIGITAL EFFECTS
0 LARGE HALL
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
6 CHORUS + DELAY
7 STAIRWELL
MID
LOW
15
0
0
0
15
15 15
MID
LOW
15
0
0
0
15
15 15
MID
LOW
15
0
0
0
15 15
15
MID
LOW
15
0
0
0
15 15
15
MID
LOW
15
0
0
0
15
15 15
MID
LOW
15
0
0
0
15 15
15
5
+12dB
MONITOR / MAINMONITOR / MAIN
0dB 0dB
+12dB
5
EFX
EFX SEND
5
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
10
5
VOLUME
0
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
-12dB
10
RETURN
0
10
TAPE IN
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
VOLUME
0 10
-12dB
+12dB
1
2
MAINMAIN
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
0dB 0dB
-12dB
+12dB
5
RETURN
0 10
EFX
10
AUX IN
5
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
PAD PAD PAD PAD PAD
LEVEL
10
OUT
5
IN
0
0 10
PAD
EFX OUT
LINE
LINE
LINE
LINE
LINE
LINE
1
MIC
MIC
MIC
MIC
MIC
MIC
FOOTSWITCH
2
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
Lead Guitar Keyboards
Signal Processor
EFFECTSEFFECTS
Bass Guitar
SIGNAL FLOW
CHANNEL 6
SIGNAL FLOW
CHANNEL 5
SIGNAL FLOW
CHANNEL 4
SIGNAL FLOW
CHANNEL 3
SIGNAL FLOW
CHANNEL 2
SIGNAL FLOW
CHANNEL 1
Direct Box
Signal Processor
Rhythm Guitar
1
2
R
N
O
S
M
A
S
1
2
R
N
O
S
M
A
S
Vocal Vocal
PA324 System Set-Ups
17
This system shows the
PA324 power amp oper-
ating in MAIN/MONITOR
mode, with two speakers
connected to POWER
AMP 1 and two monitor
speakers speaker con-
nected to POWER AMP 2.
For inputs, two micro-
phones are connected to
channel 1 and 2’s low-
impedance inputs, and
the output of the Bass
Direct Box is also con-
nected to the Low-
Impedance input on
channel 4. The
Keyboards, as well as, the
Lead and Rhythm Guitar
signal processors’ out-
puts are connected to the
PA324’s line inputs.
OUTPUT
POWER AMP 2
OUTPUT
POWER AMP 1
DSP24
BIT
POWER
DIGITAL EFFECTS
PA324
MONITOR / MAIN
SAMSON
POWERED MIXER
26
17
3
0
4
EFFECTSEFFECTS
5
DIGITAL EFFECTS
0 LARGE HALL
MID
HIGH
15
0
0
15
CHANNEL 6CHANNEL 6
MID
HIGH
15
0
0
15
CHANNEL 5CHANNEL 5
MID
HIGH
15
0
0
15
CHANNEL 4CHANNEL 4
MID
HIGH
15
0
0
15
CHANNEL 3CHANNEL 3
MID
HIGH
15
0
0
15
CHANNEL 2CHANNEL 2
MID
HIGH
15
0
0
15
CHANNEL 1CHANNEL 1
MONITOR
MAIN
MODE
MAIN
MAIN MAIN
BRIDGE
ON
OFF
PHANTOMCLIP-20 -10 -7 -4 0 +6+3
MAIN
1 MEDIUM HALL
2 LARGE ROOM
3 VOCAL ROOM #1
4 VOCAL ROOM #2
5 CHORUS + REVERB
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
LOW
0
0
15 15
MONITOR / MAINMONITOR / MAIN
6 CHORUS + DELAY
7 STAIRWELL
10
5
+12dB
+12dB
5
EFX
EFX SEND
5
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
MONITOR
5
15 15
5
VOLUME
0
-12dB
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
0dB 0dB
-12dB
10
RETURN
0
10
TAPE IN
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
EFX
10
5
0
VOLUME
0 10
-12dB
+12dB
1
2
MAINMAIN
63Hz 160Hz 400Hz 1KHz 2.5KHz 6.4KHz 16KHz
0dB 0dB
-12dB
+12dB
5
RETURN
0 10
EFX
10
AUX IN
5
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
LEVEL
10
OUT
5
IN
0
0 10
PAD PAD PAD PAD PAD
LEVEL
10
OUT
5
IN
0
0 10
PAD
EFX OUT
LINE
LINE
LINE
LINE
LINE
LINE
1
MIC
MIC
MIC
MIC
MIC
MIC
FOOTSWITCH
2
TAPE INAUX IN MAIN OUT MONITOR OUTREC OUT
Lead Guitar Keyboards
Signal Processor
EFFECTSEFFECTS
Bass Guitar
SIGNAL FLOW
CHANNEL 6
SIGNAL FLOW
CHANNEL 5
SIGNAL FLOW
CHANNEL 4
SIGNAL FLOW
CHANNEL 3
SIGNAL FLOW
CHANNEL 2
SIGNAL FLOW
CHANNEL 1
Direct Box
Signal Processor
Rhythm Guitar
1
2
R
N
O
S
M
A
S
1
2
R
N
O
S
M
A
S
Vocal Vocal
PA324 Wiring Guide
Unbalanced 1/4” Connector
XLR Balanced Wiring Guide
CONNECTING THE PA324
The are several ways to interface the PA324 to support a variety of applications. The PA324 features balanced
inputs and outputs, so connecting balanced and unbalanced signals is possible.
Balanced TRS 1/4” Connector
18
Signal
Tip (signal)Signal
Ground
Signal (tip)
Signal (ring)
Hot
Ground
Ground
Signal (ring)
Signal (tip)
Ground
Sleeve (ground)
Ring (signal)
Sleeve (ground)
Common (1)Common
Hot (2)
Tip (signal)
1
2
3
21
3
Cold
2
12
3
End View Solder Points
1
3
Female XLR
Hot (2)
Common (1) Common
Cold (3)
Male XLR
Solder Points End View
Cold (3)
Hot
Cold
Specifications
SPECIFICATIONS
Rated Output power 150W/4Ω@0.5% THD at 1KHz per amplifier
Frequency response 20Hz~20KHz+/-0.5dB@1W Output into 8Ω (AMP OUT)
20 Hz~20KHz+/-0.5@+4dB Output into 10Ω (MAIN OUT,
MONITOR OUT, EFX SEND)
Total Harmonic Distortion Less than 0.19%@20Hz~20KHz, 75W output into4Ω (AMP
OUT)
Less than 0.1%@20 Hz~20KHz+14dB output into 10KΩ
(MAIN OUT, MON OUT, EFX SEND)
HUM & Noise -127dB equivalent input noise
(Average, RS+150Ω) -100dB residual output noise (MAIN OUT, MONITOR OUT, EFX
OUT)
(with 20Hz~20KHz BPF) -79dB (MAIN OUT, MONITOR OUT) Master level control at
maximum all channel level control at minimum.
-79dB (EFX OUT) Master level control at maximum all channel
level controls at minimum
Maximum Voltage Gain 84dB CH IN (Lo-Z) to AMP OUT
66dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT
72dB CH IN (Lo-Z) to EFX OUT
48dB CH IN (Lo-Z) to REC OUT
56dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT
26dB AUX IN to MAIN OUT
24dB TAPE IN to MAIN OUT
Crosstalk 1KHz 70dB adjacent input, 70dB input to output
Input Channel Equalization HIGH 12KHz shelving (+/- 15dB Maximum)
MID 2.5KHz peaking (+/- 15dB Maximum)
LOW 80Hz shelving (+/- 15dB Maximum)
Meters 7 POINT LED METERS (-20, -10, -7, -4, 0, +3, +6dB)
Graphic Equalizer 7 bands (63, 160, 400, 1K, 2.5K, 6.4K, 16KHz)
Internal DSP Effects 24 BIT - 8 Presets: 1 - Large Hall; 2 - Medium Hal;, 3 - Large
Room; 4 - Vocal Room ; 5 - Vocal Room 2; 6 - Chorus +
Reverb; 7 - Chorus + Delay; 8 - Stairwell
Phantom Power +48V
CLIP Indicators Turn on: THD> 0.1%
Foot Switch DIGITAL EFFECT MUTE: ON/OFF
GENERAL
Power Requirement 110V-240V, 50/60Hz
Power Consumption 540W
Weight 32.3 lbs./14.7Kg
Dimensions 489mm(W) x 286mm(H) x 289mm(D)
19
Block Diagram
20
Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 9031
Syosset, NY 11791-9031
Phone: 1-800-3-SAMSON (1-800-372-6766)
Fax: 516-364-3888
www.samsontech.com
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